Lačnjevac, Uroš

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orcid::0000-0002-8851-3796
  • Lačnjevac, Uroš (23)
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Author's Bibliography

Electrochemical deposition and characterization of iridium oxide films on Ti2AlC support for oxygen evolution reaction

Elezović, Nevenka R.; Zabinski, P.; Lačnjevac, Uroš; Krstajić-Pajić, Mila; Jović, V. D.

(Springer, New York, 2021)

TY  - JOUR
AU  - Elezović, Nevenka R.
AU  - Zabinski, P.
AU  - Lačnjevac, Uroš
AU  - Krstajić-Pajić, Mila
AU  - Jović, V. D.
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/10
AB  - Two types of iridium oxide films formed at the Ti-2 AlC substrate were investigated: (1) anodically electrodeposited iridium oxide film from the solution based on IrCl(3)xH(2)O; (2) iridium oxide film prepared by cycling thin layer of electrodeposited Ir in the 0.5 M H2SO4 from - 0.25 to 1.20 V. It was shown that during anodic electrodeposition of iridium oxide film (1) coulombic efficiency decreases with increasing anodic potential, being only 3% atE = 0.7 V vs. SCE and 26% atE = 0.62 V vs. SCE. A pair of peaks corresponding to the transition Ir(III)-oxide/Ir(IV)-oxide was present on the CVs recorded in 0.5 M H2SO4. While cycling pure Ir thin layer in the solution of 0.5 M H2SO4 from - 0.25 to 1.20 V (2) up to 100 cycles, typical CV response was characterized with the prepeak and a pair of peaks corresponding to the Ir(III)/Ir(IV)-oxide transition. With the increase of cycles number to 150, additional peak at potential of 1.0 V appeared. This peak was formed on the account of pair of peaks corresponding to the Ir(III)/Ir(IV)-oxide transition. The oxygen evolution reaction (OER) was investigated at both iridium oxide films. It was shown that the Tafel slope for the OER was similar to 40 mV dec(-1)for the first polarization curve, confirming that the rds was a reaction S-OH - gt  S-O-ads + H++ e(-). As the number of recorded polarization curves increased, the activity of both types of iridium oxide films decreased, due to dissolution of iridium oxide films at the potentials of the OER. It is shown that anodically electrodeposited iridium oxide film is more active for the OER than that obtained by cycling electrodeposited iridium layer. However, both iridium oxide films exhibited insufficient stability.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Electrochemical deposition and characterization of iridium oxide films on Ti2AlC support for oxygen evolution reaction
EP  - 363
IS  - 1
SP  - 351
VL  - 25
DO  - 10.1007/s10008-020-04816-7
ER  - 
@article{
author = "Elezović, Nevenka R. and Zabinski, P. and Lačnjevac, Uroš and Krstajić-Pajić, Mila and Jović, V. D.",
year = "2021",
abstract = "Two types of iridium oxide films formed at the Ti-2 AlC substrate were investigated: (1) anodically electrodeposited iridium oxide film from the solution based on IrCl(3)xH(2)O; (2) iridium oxide film prepared by cycling thin layer of electrodeposited Ir in the 0.5 M H2SO4 from - 0.25 to 1.20 V. It was shown that during anodic electrodeposition of iridium oxide film (1) coulombic efficiency decreases with increasing anodic potential, being only 3% atE = 0.7 V vs. SCE and 26% atE = 0.62 V vs. SCE. A pair of peaks corresponding to the transition Ir(III)-oxide/Ir(IV)-oxide was present on the CVs recorded in 0.5 M H2SO4. While cycling pure Ir thin layer in the solution of 0.5 M H2SO4 from - 0.25 to 1.20 V (2) up to 100 cycles, typical CV response was characterized with the prepeak and a pair of peaks corresponding to the Ir(III)/Ir(IV)-oxide transition. With the increase of cycles number to 150, additional peak at potential of 1.0 V appeared. This peak was formed on the account of pair of peaks corresponding to the Ir(III)/Ir(IV)-oxide transition. The oxygen evolution reaction (OER) was investigated at both iridium oxide films. It was shown that the Tafel slope for the OER was similar to 40 mV dec(-1)for the first polarization curve, confirming that the rds was a reaction S-OH - gt  S-O-ads + H++ e(-). As the number of recorded polarization curves increased, the activity of both types of iridium oxide films decreased, due to dissolution of iridium oxide films at the potentials of the OER. It is shown that anodically electrodeposited iridium oxide film is more active for the OER than that obtained by cycling electrodeposited iridium layer. However, both iridium oxide films exhibited insufficient stability.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Electrochemical deposition and characterization of iridium oxide films on Ti2AlC support for oxygen evolution reaction",
pages = "363-351",
number = "1",
volume = "25",
doi = "10.1007/s10008-020-04816-7"
}
Elezović, N. R., Zabinski, P., Lačnjevac, U., Krstajić-Pajić, M.,& Jović, V. D.. (2021). Electrochemical deposition and characterization of iridium oxide films on Ti2AlC support for oxygen evolution reaction. in Journal of Solid State Electrochemistry
Springer, New York., 25(1), 351-363.
https://doi.org/10.1007/s10008-020-04816-7
Elezović NR, Zabinski P, Lačnjevac U, Krstajić-Pajić M, Jović VD. Electrochemical deposition and characterization of iridium oxide films on Ti2AlC support for oxygen evolution reaction. in Journal of Solid State Electrochemistry. 2021;25(1):351-363.
doi:10.1007/s10008-020-04816-7 .
Elezović, Nevenka R., Zabinski, P., Lačnjevac, Uroš, Krstajić-Pajić, Mila, Jović, V. D., "Electrochemical deposition and characterization of iridium oxide films on Ti2AlC support for oxygen evolution reaction" in Journal of Solid State Electrochemistry, 25, no. 1 (2021):351-363,
https://doi.org/10.1007/s10008-020-04816-7 . .
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Core–shell carbon fiber@Co1.5Mn1.5O4 mesoporous spinel electrode for high performance symmetrical supercapacitors

Mijailović, Daniel; Radmilović, Vuk; Lačnjevac, Uroš; Stojanović, Dušica; Jović, Vladimir D.; Radmilović, Velimir R.; Uskoković, Petar

(Elsevier B.V., 2020)

TY  - JOUR
AU  - Mijailović, Daniel
AU  - Radmilović, Vuk
AU  - Lačnjevac, Uroš
AU  - Stojanović, Dušica
AU  - Jović, Vladimir D.
AU  - Radmilović, Velimir R.
AU  - Uskoković, Petar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4434
AB  - We report a mesoporous composite system consisting of carbon fiber cores surrounded with Co1.5Mn1.5O4 spinel nanocrystal shells, synthesized by a simple two-step process involving single-nozzle co-electrospinning and subsequent calcination. Benefiting from the obtained core-shell structure, this composite has exhibited high specific capacitance in the two-electrode configuration, up to 384 F g(-1) at 0.28 A g(-1), with no capacitance loss after 2000 cycles at 50 mV s(-1). The incorporation of spinel nanocrystals improved the capacitive performances of composite fibers due to a synergistic effect of redox-active shells and the conductive cores, making this novel material promising for symmetrical supercapacitors.
PB  - Elsevier B.V.
T2  - Applied Surface Science
T1  - Core–shell carbon fiber@Co1.5Mn1.5O4 mesoporous spinel electrode for high performance symmetrical supercapacitors
SP  - 147678
VL  - 534
DO  - 10.1016/j.apsusc.2020.147678
ER  - 
@article{
author = "Mijailović, Daniel and Radmilović, Vuk and Lačnjevac, Uroš and Stojanović, Dušica and Jović, Vladimir D. and Radmilović, Velimir R. and Uskoković, Petar",
year = "2020",
abstract = "We report a mesoporous composite system consisting of carbon fiber cores surrounded with Co1.5Mn1.5O4 spinel nanocrystal shells, synthesized by a simple two-step process involving single-nozzle co-electrospinning and subsequent calcination. Benefiting from the obtained core-shell structure, this composite has exhibited high specific capacitance in the two-electrode configuration, up to 384 F g(-1) at 0.28 A g(-1), with no capacitance loss after 2000 cycles at 50 mV s(-1). The incorporation of spinel nanocrystals improved the capacitive performances of composite fibers due to a synergistic effect of redox-active shells and the conductive cores, making this novel material promising for symmetrical supercapacitors.",
publisher = "Elsevier B.V.",
journal = "Applied Surface Science",
title = "Core–shell carbon fiber@Co1.5Mn1.5O4 mesoporous spinel electrode for high performance symmetrical supercapacitors",
pages = "147678",
volume = "534",
doi = "10.1016/j.apsusc.2020.147678"
}
Mijailović, D., Radmilović, V., Lačnjevac, U., Stojanović, D., Jović, V. D., Radmilović, V. R.,& Uskoković, P.. (2020). Core–shell carbon fiber@Co1.5Mn1.5O4 mesoporous spinel electrode for high performance symmetrical supercapacitors. in Applied Surface Science
Elsevier B.V.., 534, 147678.
https://doi.org/10.1016/j.apsusc.2020.147678
Mijailović D, Radmilović V, Lačnjevac U, Stojanović D, Jović VD, Radmilović VR, Uskoković P. Core–shell carbon fiber@Co1.5Mn1.5O4 mesoporous spinel electrode for high performance symmetrical supercapacitors. in Applied Surface Science. 2020;534:147678.
doi:10.1016/j.apsusc.2020.147678 .
Mijailović, Daniel, Radmilović, Vuk, Lačnjevac, Uroš, Stojanović, Dušica, Jović, Vladimir D., Radmilović, Velimir R., Uskoković, Petar, "Core–shell carbon fiber@Co1.5Mn1.5O4 mesoporous spinel electrode for high performance symmetrical supercapacitors" in Applied Surface Science, 534 (2020):147678,
https://doi.org/10.1016/j.apsusc.2020.147678 . .
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Mechanism of formation of the honeycomb-like structures by the regime of the reversing current (RC) in the second range

Berkesi, Kata; Živković, Predrag M.; Elezović, Nevenka; Lačnjevac, Uroš; Hristoforou, Evangelos; Nikolić, Nebojša D.

(Elsevier B.V., 2019)

TY  - JOUR
AU  - Berkesi, Kata
AU  - Živković, Predrag M.
AU  - Elezović, Nevenka
AU  - Lačnjevac, Uroš
AU  - Hristoforou, Evangelos
AU  - Nikolić, Nebojša D.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5895
AB  - Electrodeposition of copper in the hydrogen co-deposition range by the regime of reversing current (RC) in the second range has been investigated by determination of the average current efficiency for hydrogen evolution reaction and by scanning electron (SEM) and optical (OM) microscopic analysis of the obtained deposits. Keeping the cathodic current density, the cathodic and the anodic pulses constant in all experiments, the anodic current density (ja) values were varied: 40, 80, 160, 240 and 320 mA cm−2. The Cu deposits produced by the RC regimes with different anodic current density values were compared with that obtained in a constant galvanostatic regime (DC) at the current density equal to the cathodic current density in the RC regimes. The honeycomb-like structures were formed in the DC regime and by the RC regimes with ja of 40 and 80 mA cm−2. The hole size in them was in the 60–70 μm range. Due to the decrease of quantity of evolved hydrogen with increasing anodic current density, the larger dish-like holes with dendrites at their bottom and shoulder were formed with ja values of 160, 240 and 320 mA cm−2. The maximum number of holes, and hence, the largest specific surface area of the honeycomb-like electrodes was obtained with ja = 80 mA cm−2, that can be ascribed to a suppression of coalescence of neighboring hydrogen bubbles. Application of the RC regime also led to the increase of uniformity of structures, what is concluded by cross section analysis of the formed honeycomb-like electrodes. For the first time, mechanism of Cu electrodeposition in the hydrogen co-deposition range by the RC regime in the second range was proposed and discussed.
PB  - Elsevier B.V.
T2  - Journal of Electroanalytical Chemistry
T1  - Mechanism of formation of the honeycomb-like structures by the regime of the reversing current (RC) in the second range
EP  - 410
SP  - 401
VL  - 833
DO  - 10.1016/j.jelechem.2018.12.021
ER  - 
@article{
author = "Berkesi, Kata and Živković, Predrag M. and Elezović, Nevenka and Lačnjevac, Uroš and Hristoforou, Evangelos and Nikolić, Nebojša D.",
year = "2019",
abstract = "Electrodeposition of copper in the hydrogen co-deposition range by the regime of reversing current (RC) in the second range has been investigated by determination of the average current efficiency for hydrogen evolution reaction and by scanning electron (SEM) and optical (OM) microscopic analysis of the obtained deposits. Keeping the cathodic current density, the cathodic and the anodic pulses constant in all experiments, the anodic current density (ja) values were varied: 40, 80, 160, 240 and 320 mA cm−2. The Cu deposits produced by the RC regimes with different anodic current density values were compared with that obtained in a constant galvanostatic regime (DC) at the current density equal to the cathodic current density in the RC regimes. The honeycomb-like structures were formed in the DC regime and by the RC regimes with ja of 40 and 80 mA cm−2. The hole size in them was in the 60–70 μm range. Due to the decrease of quantity of evolved hydrogen with increasing anodic current density, the larger dish-like holes with dendrites at their bottom and shoulder were formed with ja values of 160, 240 and 320 mA cm−2. The maximum number of holes, and hence, the largest specific surface area of the honeycomb-like electrodes was obtained with ja = 80 mA cm−2, that can be ascribed to a suppression of coalescence of neighboring hydrogen bubbles. Application of the RC regime also led to the increase of uniformity of structures, what is concluded by cross section analysis of the formed honeycomb-like electrodes. For the first time, mechanism of Cu electrodeposition in the hydrogen co-deposition range by the RC regime in the second range was proposed and discussed.",
publisher = "Elsevier B.V.",
journal = "Journal of Electroanalytical Chemistry",
title = "Mechanism of formation of the honeycomb-like structures by the regime of the reversing current (RC) in the second range",
pages = "410-401",
volume = "833",
doi = "10.1016/j.jelechem.2018.12.021"
}
Berkesi, K., Živković, P. M., Elezović, N., Lačnjevac, U., Hristoforou, E.,& Nikolić, N. D.. (2019). Mechanism of formation of the honeycomb-like structures by the regime of the reversing current (RC) in the second range. in Journal of Electroanalytical Chemistry
Elsevier B.V.., 833, 401-410.
https://doi.org/10.1016/j.jelechem.2018.12.021
Berkesi K, Živković PM, Elezović N, Lačnjevac U, Hristoforou E, Nikolić ND. Mechanism of formation of the honeycomb-like structures by the regime of the reversing current (RC) in the second range. in Journal of Electroanalytical Chemistry. 2019;833:401-410.
doi:10.1016/j.jelechem.2018.12.021 .
Berkesi, Kata, Živković, Predrag M., Elezović, Nevenka, Lačnjevac, Uroš, Hristoforou, Evangelos, Nikolić, Nebojša D., "Mechanism of formation of the honeycomb-like structures by the regime of the reversing current (RC) in the second range" in Journal of Electroanalytical Chemistry, 833 (2019):401-410,
https://doi.org/10.1016/j.jelechem.2018.12.021 . .
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The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts

Tripković, Dušan; Stevanović, Sanja; Gavrilović, Aleksandra; Rogan, Jelena; Lačnjevac, Uroš; Kravić, Tamara; Jovanović, Vladislava M.

(Springer, New York, 2018)

TY  - JOUR
AU  - Tripković, Dušan
AU  - Stevanović, Sanja
AU  - Gavrilović, Aleksandra
AU  - Rogan, Jelena
AU  - Lačnjevac, Uroš
AU  - Kravić, Tamara
AU  - Jovanović, Vladislava M.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3978
AB  - In our previous paper, we described in detail studies of Sn influence on electrocatalytic activity of PtSn catalyst for CO and formic acid oxidation (StevanoviAc et al., J. Phys. Chem. C, 118 (2014) 278-289). The catalyst was composed of a Pt phase, Pt3Sn alloy and very small SnO2 particles. Different electrochemical treatment enabled studies of PtSn/C having Sn both in surface and subsurface layers and skeleton structure of this catalyst with Sn only in subsurface layers. The results obtained revealed the promotional effect of surface Sn whether alloyed or as oxide above all in preventing accumulation of CO and blocking the surface Pt atoms. As a consequence, in formic acid oxidation, the currents are not entering the plateau but increasing constantly until reaching a maximum. It was concluded that at lower potentials the effect of Sn on formic acid oxidation was predominantly electronic but with increasing the potential bi-functional mechanism prevailed due to the leading role of SnO2. This role of SnO2 is restated in the present study. Therefore, CO and formic acid oxidation were examined at PtSnO2/C catalyst. The catalyst was synthesised by the same microwave-assisted polyol procedure. According to XRD analysis, the catalyst is composed of a Pt phase and SnO2 phase. The reactions were examined on PtSnO2/C catalyst treated on the same way as PtSn/C. Comparing the results obtained, the role of SnO2 is confirmed and at the same time the significance of alloyed Sn and its electronic effect is revealed.
PB  - Springer, New York
T2  - Electrocatalysis
T1  - The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts
EP  - 85
IS  - 1
SP  - 76
VL  - 9
DO  - 10.1007/s12678-017-0424-4
ER  - 
@article{
author = "Tripković, Dušan and Stevanović, Sanja and Gavrilović, Aleksandra and Rogan, Jelena and Lačnjevac, Uroš and Kravić, Tamara and Jovanović, Vladislava M.",
year = "2018",
abstract = "In our previous paper, we described in detail studies of Sn influence on electrocatalytic activity of PtSn catalyst for CO and formic acid oxidation (StevanoviAc et al., J. Phys. Chem. C, 118 (2014) 278-289). The catalyst was composed of a Pt phase, Pt3Sn alloy and very small SnO2 particles. Different electrochemical treatment enabled studies of PtSn/C having Sn both in surface and subsurface layers and skeleton structure of this catalyst with Sn only in subsurface layers. The results obtained revealed the promotional effect of surface Sn whether alloyed or as oxide above all in preventing accumulation of CO and blocking the surface Pt atoms. As a consequence, in formic acid oxidation, the currents are not entering the plateau but increasing constantly until reaching a maximum. It was concluded that at lower potentials the effect of Sn on formic acid oxidation was predominantly electronic but with increasing the potential bi-functional mechanism prevailed due to the leading role of SnO2. This role of SnO2 is restated in the present study. Therefore, CO and formic acid oxidation were examined at PtSnO2/C catalyst. The catalyst was synthesised by the same microwave-assisted polyol procedure. According to XRD analysis, the catalyst is composed of a Pt phase and SnO2 phase. The reactions were examined on PtSnO2/C catalyst treated on the same way as PtSn/C. Comparing the results obtained, the role of SnO2 is confirmed and at the same time the significance of alloyed Sn and its electronic effect is revealed.",
publisher = "Springer, New York",
journal = "Electrocatalysis",
title = "The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts",
pages = "85-76",
number = "1",
volume = "9",
doi = "10.1007/s12678-017-0424-4"
}
Tripković, D., Stevanović, S., Gavrilović, A., Rogan, J., Lačnjevac, U., Kravić, T.,& Jovanović, V. M.. (2018). The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts. in Electrocatalysis
Springer, New York., 9(1), 76-85.
https://doi.org/10.1007/s12678-017-0424-4
Tripković D, Stevanović S, Gavrilović A, Rogan J, Lačnjevac U, Kravić T, Jovanović VM. The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts. in Electrocatalysis. 2018;9(1):76-85.
doi:10.1007/s12678-017-0424-4 .
Tripković, Dušan, Stevanović, Sanja, Gavrilović, Aleksandra, Rogan, Jelena, Lačnjevac, Uroš, Kravić, Tamara, Jovanović, Vladislava M., "The Role of SnO2 on Electrocatalytic Activity of PtSn Catalysts" in Electrocatalysis, 9, no. 1 (2018):76-85,
https://doi.org/10.1007/s12678-017-0424-4 . .
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Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media

Obradović, Maja; Stancić, Z M; Lačnjevac, Uroš; Radmilović, Vuk; Gavrilović-Wohlmuther, Aleksandra; Radmilović, Velimir R.; Gojković, Snežana Lj.

(Elsevier, Amsterdam, 2016)

TY  - JOUR
AU  - Obradović, Maja
AU  - Stancić, Z M
AU  - Lačnjevac, Uroš
AU  - Radmilović, Vuk
AU  - Gavrilović-Wohlmuther, Aleksandra
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3437
AB  - Pd-Ni/C catalyst was synthesized employing a borohydride reduction method. The high area Ni was first dispersed on the carbon support and then modified by Pd nanoparticles. Transmission electron microscopy confirmed relatively even distribution of Ni across the carbon support with discrete palladium particles of about 3.3 nm mean diameter on it. Cyclic voltammetry confirmed the presence of Ni on the catalyst surface. The activity of the Pd-Ni/C catalysts for ethanol oxidation reaction (EOR) in alkaline solution was tested under the potentiodynamic and potentiostatic conditions and the results were compared to those obtained on the Pd/C catalyst. It was found that Pd-Ni/C is more active for the EOR compared to Pd/C by a factor up to 3, depending on the type of experiments and whether specific activity or mass activity are considered. During the potentiodynamic stability test an interesting phenomenon of activation of Pd-Ni/C catalyst was observed. It was found that maximum activity is attained after fifty cycles with the positive potential limit of 1.2 V, regardless of whether they were performed in the electrolyte with or without ethanol. It was postulated that potential cycling of the Pd-Ni surface causes reorganization of the catalyst surface bringing Pd and Ni sites to a more suitable arrangement for the efficient ethanol oxidation.
PB  - Elsevier, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media
EP  - 118
SP  - 110
VL  - 189
DO  - 10.1016/j.apcatb.2016.02.039
ER  - 
@article{
author = "Obradović, Maja and Stancić, Z M and Lačnjevac, Uroš and Radmilović, Vuk and Gavrilović-Wohlmuther, Aleksandra and Radmilović, Velimir R. and Gojković, Snežana Lj.",
year = "2016",
abstract = "Pd-Ni/C catalyst was synthesized employing a borohydride reduction method. The high area Ni was first dispersed on the carbon support and then modified by Pd nanoparticles. Transmission electron microscopy confirmed relatively even distribution of Ni across the carbon support with discrete palladium particles of about 3.3 nm mean diameter on it. Cyclic voltammetry confirmed the presence of Ni on the catalyst surface. The activity of the Pd-Ni/C catalysts for ethanol oxidation reaction (EOR) in alkaline solution was tested under the potentiodynamic and potentiostatic conditions and the results were compared to those obtained on the Pd/C catalyst. It was found that Pd-Ni/C is more active for the EOR compared to Pd/C by a factor up to 3, depending on the type of experiments and whether specific activity or mass activity are considered. During the potentiodynamic stability test an interesting phenomenon of activation of Pd-Ni/C catalyst was observed. It was found that maximum activity is attained after fifty cycles with the positive potential limit of 1.2 V, regardless of whether they were performed in the electrolyte with or without ethanol. It was postulated that potential cycling of the Pd-Ni surface causes reorganization of the catalyst surface bringing Pd and Ni sites to a more suitable arrangement for the efficient ethanol oxidation.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media",
pages = "118-110",
volume = "189",
doi = "10.1016/j.apcatb.2016.02.039"
}
Obradović, M., Stancić, Z. M., Lačnjevac, U., Radmilović, V., Gavrilović-Wohlmuther, A., Radmilović, V. R.,& Gojković, S. Lj.. (2016). Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media. in Applied Catalysis B-Environmental
Elsevier, Amsterdam., 189, 110-118.
https://doi.org/10.1016/j.apcatb.2016.02.039
Obradović M, Stancić ZM, Lačnjevac U, Radmilović V, Gavrilović-Wohlmuther A, Radmilović VR, Gojković SL. Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media. in Applied Catalysis B-Environmental. 2016;189:110-118.
doi:10.1016/j.apcatb.2016.02.039 .
Obradović, Maja, Stancić, Z M, Lačnjevac, Uroš, Radmilović, Vuk, Gavrilović-Wohlmuther, Aleksandra, Radmilović, Velimir R., Gojković, Snežana Lj., "Electrochemical oxidation of ethanol on palladium-nickel nanocatalyst in alkaline media" in Applied Catalysis B-Environmental, 189 (2016):110-118,
https://doi.org/10.1016/j.apcatb.2016.02.039 . .
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RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution

Lačnjevac, Uroš; Radmilović, Vuk; Radmilović, Velimir R.; Krstajić, Nedeljko V.

(Pergamon-Elsevier Science Ltd, Oxford, 2015)

TY  - JOUR
AU  - Lačnjevac, Uroš
AU  - Radmilović, Vuk
AU  - Radmilović, Velimir R.
AU  - Krstajić, Nedeljko V.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2981
AB  - Nanocomposite cathodes for the hydrogen evolution reaction (HER) were prepared by deposition of RuOx catalyst particles on self-organized titania nanotube (TiNT) arrays of highly developed surface area, following a procedure that involved the initial cathodic intercalation of H+ into the TiNT walls and the subsequent two-step ion-exchange process. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) analyses of obtained Ru-TiNT samples revealed that the concentration of RuOx particles in the size range of a few nanometers was the highest at the surface of the TiNT layer and steadily decreased to a minimum value at about 4.5 mu m inside the tubes. The capacitive behavior and electrocatalytic activity for the HER of Ru-TiNT nanocomposites, hydrogenated TiNT samples (H-TiNT) and compact TiO2 were investigated in 1.0 M HClO4 solution at room temperature by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Mott-Schottky analysis and steady-state polarization measurements. It was shown that cathodic hydrogenation treatment induced a four orders of magnitude higher concentration of electron donors in TiNT structures providing their quasimetallic behavior in the range of potentials corresponding to the HER. Ru-TiNT cathodes exhibited a more than 250 mV lower overpotential for the HER with respect to bare H-TiNT substrates at the current density of -50 mA cm (2). A decrease of the Tafel slope from about -120 mV/dec for H-TiNT samples to as low as -70 mV/dec for the Ru-TiNT sample with longer tubes was explained by the formal kinetics approach.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution
EP  - 190
SP  - 178
VL  - 168
DO  - 10.1016/j.electacta.2015.04.012
ER  - 
@article{
author = "Lačnjevac, Uroš and Radmilović, Vuk and Radmilović, Velimir R. and Krstajić, Nedeljko V.",
year = "2015",
abstract = "Nanocomposite cathodes for the hydrogen evolution reaction (HER) were prepared by deposition of RuOx catalyst particles on self-organized titania nanotube (TiNT) arrays of highly developed surface area, following a procedure that involved the initial cathodic intercalation of H+ into the TiNT walls and the subsequent two-step ion-exchange process. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) analyses of obtained Ru-TiNT samples revealed that the concentration of RuOx particles in the size range of a few nanometers was the highest at the surface of the TiNT layer and steadily decreased to a minimum value at about 4.5 mu m inside the tubes. The capacitive behavior and electrocatalytic activity for the HER of Ru-TiNT nanocomposites, hydrogenated TiNT samples (H-TiNT) and compact TiO2 were investigated in 1.0 M HClO4 solution at room temperature by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Mott-Schottky analysis and steady-state polarization measurements. It was shown that cathodic hydrogenation treatment induced a four orders of magnitude higher concentration of electron donors in TiNT structures providing their quasimetallic behavior in the range of potentials corresponding to the HER. Ru-TiNT cathodes exhibited a more than 250 mV lower overpotential for the HER with respect to bare H-TiNT substrates at the current density of -50 mA cm (2). A decrease of the Tafel slope from about -120 mV/dec for H-TiNT samples to as low as -70 mV/dec for the Ru-TiNT sample with longer tubes was explained by the formal kinetics approach.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution",
pages = "190-178",
volume = "168",
doi = "10.1016/j.electacta.2015.04.012"
}
Lačnjevac, U., Radmilović, V., Radmilović, V. R.,& Krstajić, N. V.. (2015). RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 168, 178-190.
https://doi.org/10.1016/j.electacta.2015.04.012
Lačnjevac U, Radmilović V, Radmilović VR, Krstajić NV. RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution. in Electrochimica Acta. 2015;168:178-190.
doi:10.1016/j.electacta.2015.04.012 .
Lačnjevac, Uroš, Radmilović, Vuk, Radmilović, Velimir R., Krstajić, Nedeljko V., "RuOx nanoparticles deposited on TiO2 nanotube arrays by ion-exchange method as electrocatalysts for the hydrogen evolution reaction in acid solution" in Electrochimica Acta, 168 (2015):178-190,
https://doi.org/10.1016/j.electacta.2015.04.012 . .
30
24
33

RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation

Obradović, Maja; Lačnjevac, Uroš; Babić, Biljana M.; Ercius, P.; Radmilović, Velimir R.; Krstajić, Nedeljko V.; Gojković, Snežana Lj.

(Elsevier, Amsterdam, 2015)

TY  - JOUR
AU  - Obradović, Maja
AU  - Lačnjevac, Uroš
AU  - Babić, Biljana M.
AU  - Ercius, P.
AU  - Radmilović, Velimir R.
AU  - Krstajić, Nedeljko V.
AU  - Gojković, Snežana Lj.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2978
AB  - Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts.
PB  - Elsevier, Amsterdam
T2  - Applied Catalysis B-Environmental
T1  - RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation
EP  - 152
SP  - 144
VL  - 170
DO  - 10.1016/j.apcatb.2015.01.038
ER  - 
@article{
author = "Obradović, Maja and Lačnjevac, Uroš and Babić, Biljana M. and Ercius, P. and Radmilović, Velimir R. and Krstajić, Nedeljko V. and Gojković, Snežana Lj.",
year = "2015",
abstract = "Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Catalysis B-Environmental",
title = "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation",
pages = "152-144",
volume = "170",
doi = "10.1016/j.apcatb.2015.01.038"
}
Obradović, M., Lačnjevac, U., Babić, B. M., Ercius, P., Radmilović, V. R., Krstajić, N. V.,& Gojković, S. Lj.. (2015). RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis B-Environmental
Elsevier, Amsterdam., 170, 144-152.
https://doi.org/10.1016/j.apcatb.2015.01.038
Obradović M, Lačnjevac U, Babić BM, Ercius P, Radmilović VR, Krstajić NV, Gojković SL. RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis B-Environmental. 2015;170:144-152.
doi:10.1016/j.apcatb.2015.01.038 .
Obradović, Maja, Lačnjevac, Uroš, Babić, Biljana M., Ercius, P., Radmilović, Velimir R., Krstajić, Nedeljko V., Gojković, Snežana Lj., "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation" in Applied Catalysis B-Environmental, 170 (2015):144-152,
https://doi.org/10.1016/j.apcatb.2015.01.038 . .
25
20
23

Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions

Jović, Borka M; Lačnjevac, Uroš; Jović, Vladimir D; Krstajić, Nedeljko V

(Elsevier Science Sa, Lausanne, 2015)

TY  - JOUR
AU  - Jović, Borka M
AU  - Lačnjevac, Uroš
AU  - Jović, Vladimir D
AU  - Krstajić, Nedeljko V
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5765
AB  - In order to examine the intrinsic catalytic activity and durability of the electrodeposited NiSn alloy electrodes and the electrodeposited Ni as a reference electrode material for the oxygen evolution reaction (OER) in alkaline solutions, a comparative investigation was performed. A series of NiSn electrodes were prepared by electrodeposition of NiSn alloys at different current densities onto a Ni40 mesh substrate. The surface morphology and chemical composition were studied by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The electrochemical surface characteristics were studied by cyclic voltammetry in order to find interdependence between the nickel oxyhydroxide surface electrochemistry and the activity of the electrode for the OER Quasi steady-state polarization measurements and electrochemical impedance spectroscopy (EIS) were used to determine kinetically significant parameters including the Tafel slopes and exchange current densities. Two well-defined Tafel slopes, the same for all investigated NiSn electrodes, were observed at the polarization curves, indicating that the OER was controlled by the same mechanism. It was demonstrated that any anodic polarization pretreatment led to a shift of the anodic and cathodic current peaks corresponding to the Ni(II)/Ni(III) redox transition towards cathodic potentials and, consequently, to some activation of the NiSn electrodes. The opposite behavior was obtained for the Ni electrode. Prolonged anodic polarization led to a loss of the initial catalytic activity of the Ni electrode, which was explained by the increase in the portion of gamma-NiOOH at the Ni electrode surface. Among the investigated NiSn electrodes, the NiSn100 electrode, prepared by electrodeposition at the highest cathodic current density of - 100 mAcm(-2), exhibited the highest apparent catalytic activity for the OER, entirely due to surface roughness effects. Despite the fact that the NiSn electrodes did not exhibit better intrinsic catalytic activity than Ni, their high stability during the OER and acceptable apparent activity made them promising anodes for alkaline water electrolysis.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions
EP  - 108
SP  - 100
VL  - 754
DO  - 10.1016/j.jelechem.2015.07.013
ER  - 
@article{
author = "Jović, Borka M and Lačnjevac, Uroš and Jović, Vladimir D and Krstajić, Nedeljko V",
year = "2015",
abstract = "In order to examine the intrinsic catalytic activity and durability of the electrodeposited NiSn alloy electrodes and the electrodeposited Ni as a reference electrode material for the oxygen evolution reaction (OER) in alkaline solutions, a comparative investigation was performed. A series of NiSn electrodes were prepared by electrodeposition of NiSn alloys at different current densities onto a Ni40 mesh substrate. The surface morphology and chemical composition were studied by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The electrochemical surface characteristics were studied by cyclic voltammetry in order to find interdependence between the nickel oxyhydroxide surface electrochemistry and the activity of the electrode for the OER Quasi steady-state polarization measurements and electrochemical impedance spectroscopy (EIS) were used to determine kinetically significant parameters including the Tafel slopes and exchange current densities. Two well-defined Tafel slopes, the same for all investigated NiSn electrodes, were observed at the polarization curves, indicating that the OER was controlled by the same mechanism. It was demonstrated that any anodic polarization pretreatment led to a shift of the anodic and cathodic current peaks corresponding to the Ni(II)/Ni(III) redox transition towards cathodic potentials and, consequently, to some activation of the NiSn electrodes. The opposite behavior was obtained for the Ni electrode. Prolonged anodic polarization led to a loss of the initial catalytic activity of the Ni electrode, which was explained by the increase in the portion of gamma-NiOOH at the Ni electrode surface. Among the investigated NiSn electrodes, the NiSn100 electrode, prepared by electrodeposition at the highest cathodic current density of - 100 mAcm(-2), exhibited the highest apparent catalytic activity for the OER, entirely due to surface roughness effects. Despite the fact that the NiSn electrodes did not exhibit better intrinsic catalytic activity than Ni, their high stability during the OER and acceptable apparent activity made them promising anodes for alkaline water electrolysis.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions",
pages = "108-100",
volume = "754",
doi = "10.1016/j.jelechem.2015.07.013"
}
Jović, B. M., Lačnjevac, U., Jović, V. D.,& Krstajić, N. V.. (2015). Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 754, 100-108.
https://doi.org/10.1016/j.jelechem.2015.07.013
Jović BM, Lačnjevac U, Jović VD, Krstajić NV. Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions. in Journal of Electroanalytical Chemistry. 2015;754:100-108.
doi:10.1016/j.jelechem.2015.07.013 .
Jović, Borka M, Lačnjevac, Uroš, Jović, Vladimir D, Krstajić, Nedeljko V, "Kinetics of the oxygen evolution reaction on NiSn electrodes in alkaline solutions" in Journal of Electroanalytical Chemistry, 754 (2015):100-108,
https://doi.org/10.1016/j.jelechem.2015.07.013 . .
51
21
56

Service life test of the NiSn coatings as cathodes for hydrogen evolution in industrial chlor-alkali electrolysis

Jović, Borka M; Lačnjevac, Uroš; Krstajić, Nedeljko V; Jović, Vladimir D

(Pergamon-Elsevier Science Ltd, Oxford, 2014)

TY  - JOUR
AU  - Jović, Borka M
AU  - Lačnjevac, Uroš
AU  - Krstajić, Nedeljko V
AU  - Jović, Vladimir D
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5784
AB  - In this work the "service life test" (SLT) of the NiSn alloy coatings as cathodes for the hydrogen evolution reaction (HER), deposited onto Ni 40 mesh at different current densities from the bath containing 0.1 mol dm(-3) SnCl2 + 0.3 mol dm(-3) NiCl2 + 0.6 mol dm(-3) K4P2O7 + 0.3 mol dm(-3) NH2CH2COOH at 50 degrees C, was investigated and compared with that recorded for the commercial Ni-RuO2 De Nora's (DN) cathode. The morphology and chemical compositions of all NiSn samples were investigated by SEM and EDS techniques before and after the SLT. HER during the SLT has also been monitored by EIS technique. The chemical compositions of surfaces of all NiSn alloy samples, as well as EIS results, were found to depend on the number of cycles performed during the SLT. The decrease of their catalytic activity for the HER in 32 wt.% NaOH at 90 degrees C with increasing the number of cycles (about 20-25 mV after 25 cycles) was practically identical to that for DN cathode, while NiSn samples deposited at -30 mA cm(-2), -60 mA cm(-2) and -100 mA cm(-2) possessed lower overpotential for the HER before and after SLT in comparison with that for the DN cathode. It is confirmed by the SEM-EDS and EIS analysis of the NiSn samples that the minor loss of the catalytic activity for the HER is the consequence of the change of chemical composition of NiSn coatings and decrease of the active surface area. This decrease is ascribed to partially eroded NiSn coatings due to oxygen evolution during the SLT.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Service life test of the NiSn coatings as cathodes for hydrogen evolution in industrial chlor-alkali electrolysis
EP  - 8958
IS  - 17
SP  - 8947
VL  - 39
DO  - 10.1016/j.ijhydene.2014.04.015
ER  - 
@article{
author = "Jović, Borka M and Lačnjevac, Uroš and Krstajić, Nedeljko V and Jović, Vladimir D",
year = "2014",
abstract = "In this work the "service life test" (SLT) of the NiSn alloy coatings as cathodes for the hydrogen evolution reaction (HER), deposited onto Ni 40 mesh at different current densities from the bath containing 0.1 mol dm(-3) SnCl2 + 0.3 mol dm(-3) NiCl2 + 0.6 mol dm(-3) K4P2O7 + 0.3 mol dm(-3) NH2CH2COOH at 50 degrees C, was investigated and compared with that recorded for the commercial Ni-RuO2 De Nora's (DN) cathode. The morphology and chemical compositions of all NiSn samples were investigated by SEM and EDS techniques before and after the SLT. HER during the SLT has also been monitored by EIS technique. The chemical compositions of surfaces of all NiSn alloy samples, as well as EIS results, were found to depend on the number of cycles performed during the SLT. The decrease of their catalytic activity for the HER in 32 wt.% NaOH at 90 degrees C with increasing the number of cycles (about 20-25 mV after 25 cycles) was practically identical to that for DN cathode, while NiSn samples deposited at -30 mA cm(-2), -60 mA cm(-2) and -100 mA cm(-2) possessed lower overpotential for the HER before and after SLT in comparison with that for the DN cathode. It is confirmed by the SEM-EDS and EIS analysis of the NiSn samples that the minor loss of the catalytic activity for the HER is the consequence of the change of chemical composition of NiSn coatings and decrease of the active surface area. This decrease is ascribed to partially eroded NiSn coatings due to oxygen evolution during the SLT.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Service life test of the NiSn coatings as cathodes for hydrogen evolution in industrial chlor-alkali electrolysis",
pages = "8958-8947",
number = "17",
volume = "39",
doi = "10.1016/j.ijhydene.2014.04.015"
}
Jović, B. M., Lačnjevac, U., Krstajić, N. V.,& Jović, V. D.. (2014). Service life test of the NiSn coatings as cathodes for hydrogen evolution in industrial chlor-alkali electrolysis. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 39(17), 8947-8958.
https://doi.org/10.1016/j.ijhydene.2014.04.015
Jović BM, Lačnjevac U, Krstajić NV, Jović VD. Service life test of the NiSn coatings as cathodes for hydrogen evolution in industrial chlor-alkali electrolysis. in International Journal of Hydrogen Energy. 2014;39(17):8947-8958.
doi:10.1016/j.ijhydene.2014.04.015 .
Jović, Borka M, Lačnjevac, Uroš, Krstajić, Nedeljko V, Jović, Vladimir D, "Service life test of the NiSn coatings as cathodes for hydrogen evolution in industrial chlor-alkali electrolysis" in International Journal of Hydrogen Energy, 39, no. 17 (2014):8947-8958,
https://doi.org/10.1016/j.ijhydene.2014.04.015 . .
22
10
23

Ti substrate coated with composite Cr–MoO2 coatings as highly selective cathode materials in hypochlorite production

Lačnjevac, Uroš; Jović, Borka; Gajić Krstajić, Ljiljana; Kovač, Janez; Jović, Vladimir; Krstajić, Nedeljko

(Elsevier, 2013)

TY  - JOUR
AU  - Lačnjevac, Uroš
AU  - Jović, Borka
AU  - Gajić Krstajić, Ljiljana
AU  - Kovač, Janez
AU  - Jović, Vladimir
AU  - Krstajić, Nedeljko
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5725
AB  - The aim of this work was to investigate the possibility of preparation of the composite Cr–MoO2 coatings onto steel and titanium substrates as cathode materials with high selective properties which imply the suppression of hypochlorite reduction as a side reaction during hypochlorite commercial production. The electrodes were prepared by simultaneous deposition of chromium and suspended MoO2 particles on titanium substrate from acid chromium (VI) bath. The current efficiency for electrodeposition of the composite coatings did not vary significantly with the concentration of suspended MoO2 particles. The content of molybdenum in the deposits was relatively low (0.2–1.5 at.%) and increased with increasing the concentration of suspended MoO2 particles in the bath, in the range from 0 to 10 g dm−3. With further increase in the concentration of MoO2, the content of molybdenum in the coating varied insignificantly.X-ray photoelectron spectroscopy-XPS and EDS analysis were applied to analyze elemental composition and chemical bonding of elements on the surface and in the sub-surface region of obtained coatings. When the concentration of MoO2 particles in the bath was raised above 5 g dm−3, the appearance of the coating changed from the typical pure chromium deposit to needle-like deposit with the appearance of black inclusions on the surface. XPS analysis and corresponding Cr 2p spectra showed the presence of chromium oxide, probably Cr2O3 with Cr(3+) valence state on the surface and in the sub-surface region of Cr–MoO2 coatings.Investigation of the current efficiency for the hydrogen evolution reaction (HER) on Cr–MoO2 cathodes showed that it increased with the increase of the content of MoO2 particles in the coating, exceeding the value of 97% in the solution with the hypochlorite concentration of 0.21 mol dm−3. Under the same conditions, the current efficiency for the HER on Ti and Ti/Cr cathodes is very low (≈20%), and corresponding polarization curves confirmed the fact that the side reaction of hypochlorite reduction takes place in the diffusion-controlled regime on these electrodes. The high selectivity of Cr–MoO2 coating is probably caused by the presence of chromium oxide (hydroxide) formed at the surface of the coating during co-deposition of Cr and MoO2 particles, which prevents hypochlorite reduction on the cathode during the HER.
PB  - Elsevier
T2  - Electrochimica Acta
T1  - Ti substrate coated with composite Cr–MoO2 coatings as highly selective cathode materials in hypochlorite production
EP  - 42
SP  - 34
VL  - 96
DO  - 10.1016/j.electacta.2013.02.086
UR  - https://hdl.handle.net/21.15107/rcub_dais_358
ER  - 
@article{
author = "Lačnjevac, Uroš and Jović, Borka and Gajić Krstajić, Ljiljana and Kovač, Janez and Jović, Vladimir and Krstajić, Nedeljko",
year = "2013",
abstract = "The aim of this work was to investigate the possibility of preparation of the composite Cr–MoO2 coatings onto steel and titanium substrates as cathode materials with high selective properties which imply the suppression of hypochlorite reduction as a side reaction during hypochlorite commercial production. The electrodes were prepared by simultaneous deposition of chromium and suspended MoO2 particles on titanium substrate from acid chromium (VI) bath. The current efficiency for electrodeposition of the composite coatings did not vary significantly with the concentration of suspended MoO2 particles. The content of molybdenum in the deposits was relatively low (0.2–1.5 at.%) and increased with increasing the concentration of suspended MoO2 particles in the bath, in the range from 0 to 10 g dm−3. With further increase in the concentration of MoO2, the content of molybdenum in the coating varied insignificantly.X-ray photoelectron spectroscopy-XPS and EDS analysis were applied to analyze elemental composition and chemical bonding of elements on the surface and in the sub-surface region of obtained coatings. When the concentration of MoO2 particles in the bath was raised above 5 g dm−3, the appearance of the coating changed from the typical pure chromium deposit to needle-like deposit with the appearance of black inclusions on the surface. XPS analysis and corresponding Cr 2p spectra showed the presence of chromium oxide, probably Cr2O3 with Cr(3+) valence state on the surface and in the sub-surface region of Cr–MoO2 coatings.Investigation of the current efficiency for the hydrogen evolution reaction (HER) on Cr–MoO2 cathodes showed that it increased with the increase of the content of MoO2 particles in the coating, exceeding the value of 97% in the solution with the hypochlorite concentration of 0.21 mol dm−3. Under the same conditions, the current efficiency for the HER on Ti and Ti/Cr cathodes is very low (≈20%), and corresponding polarization curves confirmed the fact that the side reaction of hypochlorite reduction takes place in the diffusion-controlled regime on these electrodes. The high selectivity of Cr–MoO2 coating is probably caused by the presence of chromium oxide (hydroxide) formed at the surface of the coating during co-deposition of Cr and MoO2 particles, which prevents hypochlorite reduction on the cathode during the HER.",
publisher = "Elsevier",
journal = "Electrochimica Acta",
title = "Ti substrate coated with composite Cr–MoO2 coatings as highly selective cathode materials in hypochlorite production",
pages = "42-34",
volume = "96",
doi = "10.1016/j.electacta.2013.02.086",
url = "https://hdl.handle.net/21.15107/rcub_dais_358"
}
Lačnjevac, U., Jović, B., Gajić Krstajić, L., Kovač, J., Jović, V.,& Krstajić, N.. (2013). Ti substrate coated with composite Cr–MoO2 coatings as highly selective cathode materials in hypochlorite production. in Electrochimica Acta
Elsevier., 96, 34-42.
https://doi.org/10.1016/j.electacta.2013.02.086
https://hdl.handle.net/21.15107/rcub_dais_358
Lačnjevac U, Jović B, Gajić Krstajić L, Kovač J, Jović V, Krstajić N. Ti substrate coated with composite Cr–MoO2 coatings as highly selective cathode materials in hypochlorite production. in Electrochimica Acta. 2013;96:34-42.
doi:10.1016/j.electacta.2013.02.086
https://hdl.handle.net/21.15107/rcub_dais_358 .
Lačnjevac, Uroš, Jović, Borka, Gajić Krstajić, Ljiljana, Kovač, Janez, Jović, Vladimir, Krstajić, Nedeljko, "Ti substrate coated with composite Cr–MoO2 coatings as highly selective cathode materials in hypochlorite production" in Electrochimica Acta, 96 (2013):34-42,
https://doi.org/10.1016/j.electacta.2013.02.086 .,
https://hdl.handle.net/21.15107/rcub_dais_358 .
11
8
13

Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst

Krstajić, Mila; Obradović, Maja; Babić, Biljana M.; Radmilović, Velimir R.; Lačnjevac, Uroš; Krstajić, Nedeljko V.; Gojković, Snežana Lj.

(Serbian Chemical Society, Belgrade, 2013)

TY  - JOUR
AU  - Krstajić, Mila
AU  - Obradović, Maja
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir R.
AU  - Lačnjevac, Uroš
AU  - Krstajić, Nedeljko V.
AU  - Gojković, Snežana Lj.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2353
AB  - Ru-doped SnO2 powder, (RuxSn1-x)O2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn1-x)O2 support and the Pt/(RuxSn1-x)O2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O2 was found to be a two-phase material consisting of probably a solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COads and methanol on Pt/(RuxSn1-x)O2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu.
AB  - Sintetizovan je prah SnO2 dopovan rutenijumom, (RuxSn1-x)O2, sa atomskim odnosom Sn:Ru od 9:1, i korišćen kao nosač nanočestica platine. Udeo Pt u dobijenom katalizatoru, Pt/(RuxSn1-x)O2, bio je 30 mas. %. Nosač i katalizator su karakterisani difrakcijom X-zraka, energetski disperzivnom spektroskopijom X-zraka i transmisionom elektronskom mikroskopijom (TEM). Pokazano je da je (RuxSn1-x)O2 dvofazni materijal koji verovatno sadrži čvrst rastvor RuO2 u SnO2 i čist RuO2. Prosečna veličina zrna Pt, određena TEM analizom, iznosi 5,3 nm. Ciklična voltametrija Pt/(RuxSn1-x)O2 ukazala je na dobru provodnost nosača katalizatora i na uobičajene karakteristike Pt. Upoređeni su rezultati elektrohemijske oksidacije COads na Pt/(RuxSn1-x)O2, Pt/C i PtRu/C. Oksidacija COads na Pt/(RuxSn1-x)O2 počinje na negativnijim potencijalima u odnosu na PtRu/C i Pt/C. Potenciodinamičke polarizacione krive i hronoamperometrijske krive za oksidaciju metanola ukazuju na veću početnu aktivnost katalizatora Pt/(RuxSn1-x)O2 u odnosu na PtRu/C, ali i na veće smanjenje gustine struje tokom vremena. Test potenciodinamičke stabilnosti katalizatora je ukazao da je smanjenje aktivnosti Pt/(RuxSn1-x)O2 i Pt/C prvenstveno prouzrokovano trovanjem površine Pt proizvodima nepotpune oksidacije metanola, koje se uglavnom odigrava tokom prvog ciklusa. Kod PtRu/C trovanje površine je minimalno, a smanjenje aktivnosti je prouzrokovano smanjenjem elektrohemijski aktivne površine PtRu.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst
T1  - Elektrohemijska oksidacija metanola na katalizatoru Pt/(RuxSn1-x)O2
EP  - 1716
IS  - 11
SP  - 1703
VL  - 78
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2353
ER  - 
@article{
author = "Krstajić, Mila and Obradović, Maja and Babić, Biljana M. and Radmilović, Velimir R. and Lačnjevac, Uroš and Krstajić, Nedeljko V. and Gojković, Snežana Lj.",
year = "2013",
abstract = "Ru-doped SnO2 powder, (RuxSn1-x)O2, with a Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass % loading). The (RuxSn1-x)O2 support and the Pt/(RuxSn1-x)O2 catalyst were characterized by X-ray diffraction measurements, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). The (RuxSn1-x)O2 was found to be a two-phase material consisting of probably a solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O2 indicated good conductivity of the support and displayed the usual features of Pt. The results of the electrochemical oxidation of COads and methanol on Pt/(RuxSn1-x)O2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O2 starts at lower positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of the Pt/(RuxSn1-x)O2 catalyst compared to PtRu/C, but also a greater loss in current density over time. A potentiodynamic stability test of the catalysts revealed that deactivation of Pt/(RuxSn1-x)O2 and Pt/C was primarily caused by poisoning of the Pt surface by residues of methanol oxidation, which mostly occurred during the first potential cycle. In the case of PtRu/C, the poisoning of the surface was minor and deactivation was caused by surface area loss of the PtRu., Sintetizovan je prah SnO2 dopovan rutenijumom, (RuxSn1-x)O2, sa atomskim odnosom Sn:Ru od 9:1, i korišćen kao nosač nanočestica platine. Udeo Pt u dobijenom katalizatoru, Pt/(RuxSn1-x)O2, bio je 30 mas. %. Nosač i katalizator su karakterisani difrakcijom X-zraka, energetski disperzivnom spektroskopijom X-zraka i transmisionom elektronskom mikroskopijom (TEM). Pokazano je da je (RuxSn1-x)O2 dvofazni materijal koji verovatno sadrži čvrst rastvor RuO2 u SnO2 i čist RuO2. Prosečna veličina zrna Pt, određena TEM analizom, iznosi 5,3 nm. Ciklična voltametrija Pt/(RuxSn1-x)O2 ukazala je na dobru provodnost nosača katalizatora i na uobičajene karakteristike Pt. Upoređeni su rezultati elektrohemijske oksidacije COads na Pt/(RuxSn1-x)O2, Pt/C i PtRu/C. Oksidacija COads na Pt/(RuxSn1-x)O2 počinje na negativnijim potencijalima u odnosu na PtRu/C i Pt/C. Potenciodinamičke polarizacione krive i hronoamperometrijske krive za oksidaciju metanola ukazuju na veću početnu aktivnost katalizatora Pt/(RuxSn1-x)O2 u odnosu na PtRu/C, ali i na veće smanjenje gustine struje tokom vremena. Test potenciodinamičke stabilnosti katalizatora je ukazao da je smanjenje aktivnosti Pt/(RuxSn1-x)O2 i Pt/C prvenstveno prouzrokovano trovanjem površine Pt proizvodima nepotpune oksidacije metanola, koje se uglavnom odigrava tokom prvog ciklusa. Kod PtRu/C trovanje površine je minimalno, a smanjenje aktivnosti je prouzrokovano smanjenjem elektrohemijski aktivne površine PtRu.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst, Elektrohemijska oksidacija metanola na katalizatoru Pt/(RuxSn1-x)O2",
pages = "1716-1703",
number = "11",
volume = "78",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2353"
}
Krstajić, M., Obradović, M., Babić, B. M., Radmilović, V. R., Lačnjevac, U., Krstajić, N. V.,& Gojković, S. Lj.. (2013). Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 78(11), 1703-1716.
https://hdl.handle.net/21.15107/rcub_technorep_2353
Krstajić M, Obradović M, Babić BM, Radmilović VR, Lačnjevac U, Krstajić NV, Gojković SL. Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst. in Journal of the Serbian Chemical Society. 2013;78(11):1703-1716.
https://hdl.handle.net/21.15107/rcub_technorep_2353 .
Krstajić, Mila, Obradović, Maja, Babić, Biljana M., Radmilović, Velimir R., Lačnjevac, Uroš, Krstajić, Nedeljko V., Gojković, Snežana Lj., "Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst" in Journal of the Serbian Chemical Society, 78, no. 11 (2013):1703-1716,
https://hdl.handle.net/21.15107/rcub_technorep_2353 .
1
2

Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solutions

Jović, Borka M; Lačnjevac, Uroš; Krstajić, Nedeljko V; Jović, Vladimir D

(Pergamon-Elsevier Science Ltd, Oxford, 2013)

TY  - JOUR
AU  - Jović, Borka M
AU  - Lačnjevac, Uroš
AU  - Krstajić, Nedeljko V
AU  - Jović, Vladimir D
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5706
AB  - In this work the hydrogen evolution reaction (HER) at Ni-Sn alloy coatings, deposited onto Ni 40 mesh at different current densities from the bath containing 0.1 mol dm(-3) SnCl2 + 0.3 mol dm(-3) NiCl2 in the pyrophosphate-glycine solutions, was investigated by polarization and EIS measurements. The morphology and chemical compositions of all samples were investigated by the SEM and EDS techniques. It was shown that their morphologies and chemical compositions depend on the deposition current density. The increase of their catalytic activity for the HER in 6 mol dm(-3) KOH and in 1 mol dm(-3) NaOH with increasing the deposition current density was shown to be the consequence of the change of both: their chemical composition and morphology.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solutions
EP  - 818
SP  - 813
VL  - 114
DO  - 10.1016/j.electacta.2013.06.024
ER  - 
@article{
author = "Jović, Borka M and Lačnjevac, Uroš and Krstajić, Nedeljko V and Jović, Vladimir D",
year = "2013",
abstract = "In this work the hydrogen evolution reaction (HER) at Ni-Sn alloy coatings, deposited onto Ni 40 mesh at different current densities from the bath containing 0.1 mol dm(-3) SnCl2 + 0.3 mol dm(-3) NiCl2 in the pyrophosphate-glycine solutions, was investigated by polarization and EIS measurements. The morphology and chemical compositions of all samples were investigated by the SEM and EDS techniques. It was shown that their morphologies and chemical compositions depend on the deposition current density. The increase of their catalytic activity for the HER in 6 mol dm(-3) KOH and in 1 mol dm(-3) NaOH with increasing the deposition current density was shown to be the consequence of the change of both: their chemical composition and morphology.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solutions",
pages = "818-813",
volume = "114",
doi = "10.1016/j.electacta.2013.06.024"
}
Jović, B. M., Lačnjevac, U., Krstajić, N. V.,& Jović, V. D.. (2013). Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solutions. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 114, 813-818.
https://doi.org/10.1016/j.electacta.2013.06.024
Jović BM, Lačnjevac U, Krstajić NV, Jović VD. Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solutions. in Electrochimica Acta. 2013;114:813-818.
doi:10.1016/j.electacta.2013.06.024 .
Jović, Borka M, Lačnjevac, Uroš, Krstajić, Nedeljko V, Jović, Vladimir D, "Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solutions" in Electrochimica Acta, 114 (2013):813-818,
https://doi.org/10.1016/j.electacta.2013.06.024 . .
46
25
49

Kinetics of the hydrogen evolution reaction on Ni-(Ebonex-supported Ru) composite coatings in alkaline solution

Lačnjevac, Uroš; Jović, Borka M; Jović, Vladimir D; Radmilović, Velimir R; Krstajić, Nedeljko V

(Pergamon-Elsevier Science Ltd, Oxford, 2013)

TY  - JOUR
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Jović, Vladimir D
AU  - Radmilović, Velimir R
AU  - Krstajić, Nedeljko V
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5703
AB  - The hydrogen evolution reaction (HER) was studied on Ni, Ni-Ebonex and Ni-(Ebonex-Ru) coatings in 1 mol dm(-3) NaOH solution at 25 degrees C. The composite coatings were electro-deposited from a nickel Watts-type bath containing suspended Ebonex (chemical composition mainly Ti4O7) or Ebonex-supported Ru(10 wt.%) particles (0-10 g dm(-3)) onto Ni mesh substrate. The electrodes were investigated by cyclic voltammetry (CV), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in combination with energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), electrochemical impedance spectroscopy (EIS) and polarization measurements. These investigations showed that the roughness factor of the Ni-(Ebonex-Ru) and the Ni-Ebonex coating was 29 and 6 times higher than that of a pure Ni coating, respectively. In the whole potential range of the HER only one Tafel slope of about -120 mV was present at the polarization curves of Ni and Ni-Ebonex electrodes, with increased activity of the latter being attributed only to the increase of the electrochemically active surface area. The Ni(Ebonex-Ru) electrodes exhibited the highest intrinsic catalytic activity with two Tafel slopes, indicating also that the HER takes place exclusively. on Ru active sites.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Kinetics of the hydrogen evolution reaction on Ni-(Ebonex-supported Ru) composite coatings in alkaline solution
EP  - 10190
IS  - 25
SP  - 10178
VL  - 38
DO  - 10.1016/j.ijhydene.2013.06.037
ER  - 
@article{
author = "Lačnjevac, Uroš and Jović, Borka M and Jović, Vladimir D and Radmilović, Velimir R and Krstajić, Nedeljko V",
year = "2013",
abstract = "The hydrogen evolution reaction (HER) was studied on Ni, Ni-Ebonex and Ni-(Ebonex-Ru) coatings in 1 mol dm(-3) NaOH solution at 25 degrees C. The composite coatings were electro-deposited from a nickel Watts-type bath containing suspended Ebonex (chemical composition mainly Ti4O7) or Ebonex-supported Ru(10 wt.%) particles (0-10 g dm(-3)) onto Ni mesh substrate. The electrodes were investigated by cyclic voltammetry (CV), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in combination with energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), electrochemical impedance spectroscopy (EIS) and polarization measurements. These investigations showed that the roughness factor of the Ni-(Ebonex-Ru) and the Ni-Ebonex coating was 29 and 6 times higher than that of a pure Ni coating, respectively. In the whole potential range of the HER only one Tafel slope of about -120 mV was present at the polarization curves of Ni and Ni-Ebonex electrodes, with increased activity of the latter being attributed only to the increase of the electrochemically active surface area. The Ni(Ebonex-Ru) electrodes exhibited the highest intrinsic catalytic activity with two Tafel slopes, indicating also that the HER takes place exclusively. on Ru active sites.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Kinetics of the hydrogen evolution reaction on Ni-(Ebonex-supported Ru) composite coatings in alkaline solution",
pages = "10190-10178",
number = "25",
volume = "38",
doi = "10.1016/j.ijhydene.2013.06.037"
}
Lačnjevac, U., Jović, B. M., Jović, V. D., Radmilović, V. R.,& Krstajić, N. V.. (2013). Kinetics of the hydrogen evolution reaction on Ni-(Ebonex-supported Ru) composite coatings in alkaline solution. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 38(25), 10178-10190.
https://doi.org/10.1016/j.ijhydene.2013.06.037
Lačnjevac U, Jović BM, Jović VD, Radmilović VR, Krstajić NV. Kinetics of the hydrogen evolution reaction on Ni-(Ebonex-supported Ru) composite coatings in alkaline solution. in International Journal of Hydrogen Energy. 2013;38(25):10178-10190.
doi:10.1016/j.ijhydene.2013.06.037 .
Lačnjevac, Uroš, Jović, Borka M, Jović, Vladimir D, Radmilović, Velimir R, Krstajić, Nedeljko V, "Kinetics of the hydrogen evolution reaction on Ni-(Ebonex-supported Ru) composite coatings in alkaline solution" in International Journal of Hydrogen Energy, 38, no. 25 (2013):10178-10190,
https://doi.org/10.1016/j.ijhydene.2013.06.037 . .
36
21
37

The influence of substituted aromatic aldehydes on the electrodeposition of Zn-Mn alloy

Bučko, Mihael; Lačnjevac, Uroš; Bajat, Jelena

(Serbian Chemical Society, Belgrade, 2013)

TY  - JOUR
AU  - Bučko, Mihael
AU  - Lačnjevac, Uroš
AU  - Bajat, Jelena
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2355
AB  - Additives are necessary in the electrodeposition of Zn-Mn alloys at high current densities, in order to reduce the hydrogen evolution reaction and prevent dendrite formation. The influences of two aromatic aldehydes, 4-hydroxy-benzaldehyde and 3,4-dimethoxy-benzaldehyde, as additives in the Zn-Mn plating electrolyte, were examined in this study. The characterization of the coatings by scanning electron microscopy and X-ray energy dispersive spectroscopy, as well as an examination of the effect of the additives by electrochemical methods, indicated a complex involvement of additive molecules in hydrogen evolution, as well as in Zn2+ and Mn2+ reduction. Consequently, a levelling action could be achieved and the chemical composition of the Zn-Mn alloy tailored by the addition of the proper type and concentration of additive in the plating electrolyte.
AB  - U cilju usporavanja reakcije izdvajanja vodonika i sprečavanja nastajanja dendrita prilikom elektrohemijskog taloženja Zn-Mn legura visokim gustinama struje, neophodna je primena specifičnih dodataka. U ovom radu je ispitivan uticaj dva aromatična aldehida, 4-hidroksi-benzaldehida i 3,4-dimetoksi-benzaldehida, kao specifičnih dodataka u taloženju Zn-Mn legura. Karakterizacija prevlaka skenirajućom elektronskom mikroskopijom i energetskom disperzionom spektroskopijom X-zraka, kao i ispitivanje uticaja specifičnih dodataka na proces taloženja elektrohemijskim metodama, ukazuju na složene interakcije molekula aromatičnih aldehida u procesima izdvajanja vodonika i redukcije jona cinka i mangana. U radu je pokazano da se samo primenom određene koncentracije i vrste specifičnog dodatka može menjati hemijski sastav Zn-Mn legure i mogu se dobijati prevlake manje hrapavosti.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - The influence of substituted aromatic aldehydes on the electrodeposition of Zn-Mn alloy
T1  - Uloga supstituisanih aromatičnih aldehida u elektrohemijskom taloženju Zn-Mn legura
EP  - 1581
IS  - 10
SP  - 1569
VL  - 78
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2355
ER  - 
@article{
author = "Bučko, Mihael and Lačnjevac, Uroš and Bajat, Jelena",
year = "2013",
abstract = "Additives are necessary in the electrodeposition of Zn-Mn alloys at high current densities, in order to reduce the hydrogen evolution reaction and prevent dendrite formation. The influences of two aromatic aldehydes, 4-hydroxy-benzaldehyde and 3,4-dimethoxy-benzaldehyde, as additives in the Zn-Mn plating electrolyte, were examined in this study. The characterization of the coatings by scanning electron microscopy and X-ray energy dispersive spectroscopy, as well as an examination of the effect of the additives by electrochemical methods, indicated a complex involvement of additive molecules in hydrogen evolution, as well as in Zn2+ and Mn2+ reduction. Consequently, a levelling action could be achieved and the chemical composition of the Zn-Mn alloy tailored by the addition of the proper type and concentration of additive in the plating electrolyte., U cilju usporavanja reakcije izdvajanja vodonika i sprečavanja nastajanja dendrita prilikom elektrohemijskog taloženja Zn-Mn legura visokim gustinama struje, neophodna je primena specifičnih dodataka. U ovom radu je ispitivan uticaj dva aromatična aldehida, 4-hidroksi-benzaldehida i 3,4-dimetoksi-benzaldehida, kao specifičnih dodataka u taloženju Zn-Mn legura. Karakterizacija prevlaka skenirajućom elektronskom mikroskopijom i energetskom disperzionom spektroskopijom X-zraka, kao i ispitivanje uticaja specifičnih dodataka na proces taloženja elektrohemijskim metodama, ukazuju na složene interakcije molekula aromatičnih aldehida u procesima izdvajanja vodonika i redukcije jona cinka i mangana. U radu je pokazano da se samo primenom određene koncentracije i vrste specifičnog dodatka može menjati hemijski sastav Zn-Mn legure i mogu se dobijati prevlake manje hrapavosti.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "The influence of substituted aromatic aldehydes on the electrodeposition of Zn-Mn alloy, Uloga supstituisanih aromatičnih aldehida u elektrohemijskom taloženju Zn-Mn legura",
pages = "1581-1569",
number = "10",
volume = "78",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2355"
}
Bučko, M., Lačnjevac, U.,& Bajat, J.. (2013). The influence of substituted aromatic aldehydes on the electrodeposition of Zn-Mn alloy. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 78(10), 1569-1581.
https://hdl.handle.net/21.15107/rcub_technorep_2355
Bučko M, Lačnjevac U, Bajat J. The influence of substituted aromatic aldehydes on the electrodeposition of Zn-Mn alloy. in Journal of the Serbian Chemical Society. 2013;78(10):1569-1581.
https://hdl.handle.net/21.15107/rcub_technorep_2355 .
Bučko, Mihael, Lačnjevac, Uroš, Bajat, Jelena, "The influence of substituted aromatic aldehydes on the electrodeposition of Zn-Mn alloy" in Journal of the Serbian Chemical Society, 78, no. 10 (2013):1569-1581,
https://hdl.handle.net/21.15107/rcub_technorep_2355 .
9
13

Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte

Bucko, M.; Rogan, Jelena; Jokić, Bojan; Mitrić, Miodrag; Lačnjevac, Uroš; Bajat, Jelena

(Springer, New York, 2013)

TY  - JOUR
AU  - Bucko, M.
AU  - Rogan, Jelena
AU  - Jokić, Bojan
AU  - Mitrić, Miodrag
AU  - Lačnjevac, Uroš
AU  - Bajat, Jelena
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2405
AB  - The Zn-Mn alloy electrodeposition on a steel electrode in chloride electrolyte was investigated with the aim of obtaining deposits with as high as possible Mn percent. It was found that the deposition current density and concentration of Mn2+ ion in the chloride electrolyte significantly affect the Mn content in the alloy coating as well as the coating surface morphology. There was a transition from dendritic and spongy to smooth, bright, and amorphous structure of Zn-Mn deposits, when some critical deposition current density was reached, probably due to the metal oxyhydroxide inclusion in the coatings. Several plating additives were tested in order to decrease the hydroxide content and to improve surface appearance of the deposits. The 4-hydroxy-benzaldehyde was found to decrease oxygen and increase Mn percent in the coatings, and to significantly improve their surface morphology.
PB  - Springer, New York
T2  - Journal of Solid State Electrochemistry
T1  - Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte
EP  - 1419
IS  - 5
SP  - 1409
VL  - 17
DO  - 10.1007/s10008-013-2004-8
ER  - 
@article{
author = "Bucko, M. and Rogan, Jelena and Jokić, Bojan and Mitrić, Miodrag and Lačnjevac, Uroš and Bajat, Jelena",
year = "2013",
abstract = "The Zn-Mn alloy electrodeposition on a steel electrode in chloride electrolyte was investigated with the aim of obtaining deposits with as high as possible Mn percent. It was found that the deposition current density and concentration of Mn2+ ion in the chloride electrolyte significantly affect the Mn content in the alloy coating as well as the coating surface morphology. There was a transition from dendritic and spongy to smooth, bright, and amorphous structure of Zn-Mn deposits, when some critical deposition current density was reached, probably due to the metal oxyhydroxide inclusion in the coatings. Several plating additives were tested in order to decrease the hydroxide content and to improve surface appearance of the deposits. The 4-hydroxy-benzaldehyde was found to decrease oxygen and increase Mn percent in the coatings, and to significantly improve their surface morphology.",
publisher = "Springer, New York",
journal = "Journal of Solid State Electrochemistry",
title = "Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte",
pages = "1419-1409",
number = "5",
volume = "17",
doi = "10.1007/s10008-013-2004-8"
}
Bucko, M., Rogan, J., Jokić, B., Mitrić, M., Lačnjevac, U.,& Bajat, J.. (2013). Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte. in Journal of Solid State Electrochemistry
Springer, New York., 17(5), 1409-1419.
https://doi.org/10.1007/s10008-013-2004-8
Bucko M, Rogan J, Jokić B, Mitrić M, Lačnjevac U, Bajat J. Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte. in Journal of Solid State Electrochemistry. 2013;17(5):1409-1419.
doi:10.1007/s10008-013-2004-8 .
Bucko, M., Rogan, Jelena, Jokić, Bojan, Mitrić, Miodrag, Lačnjevac, Uroš, Bajat, Jelena, "Electrodeposition of Zn-Mn alloys at high current densities from chloride electrolyte" in Journal of Solid State Electrochemistry, 17, no. 5 (2013):1409-1419,
https://doi.org/10.1007/s10008-013-2004-8 . .
3
24
21

Voltammetric and Square-Wave Anodic Stripping Determination of Amlodipine Besylate on Gold Electrode

Stoiljković, Zora Ž.; Avramov-Ivić, Milka; Petrović, Slobodan; Mijin, Dušan; Stevanović, Sanja; Lačnjevac, Uroš; Marinković, Aleksandar

(Electrochemical Science Group, Beograd, 2012)

TY  - JOUR
AU  - Stoiljković, Zora Ž.
AU  - Avramov-Ivić, Milka
AU  - Petrović, Slobodan
AU  - Mijin, Dušan
AU  - Stevanović, Sanja
AU  - Lačnjevac, Uroš
AU  - Marinković, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1984
AB  - The oxidative behaviour of amlodipine besylate was studied. The gold electrode and Au/o-MWCNT (oxidized multi-wall carbon nanotubes) were used for determination of amlodipine besylate standard and as a content of Alopres tablet, in 0.05 M NaHCO3 and in phosphate buffer (pH=11) by cyclic voltammetry and square-wave anodic stripping voltammetry. Electrode surfaces were characterized by AFM in the presence of amlodipine and the concentrations of drugs in electrolytes were simultaneously followed by HPLC. The linear dependency of the anodic currents of amlodipine besylate as standard and in Alopres tablet vs. concentration was observed in both electrolytes, but in phosphate buffer for the higher concentrations. The peak currents obtained in all experiments are more than fifty-fold higher comparing to all previously published results concerning the glassy carbon electrode and the carbon paste electrode. The gold electrode is better catalyst for anodic oxidation of amlodipine besylate than glassy carbone. The results obtained with Au/o-MWCNT show lower anodic activity comparing to previously published GC/o-MWCNT. GC/o-MWCNT is better catalyst than Au/o-MWCNT under similar experimental conditions.
PB  - Electrochemical Science Group, Beograd
T2  - International Journal of Electrochemical Science
T1  - Voltammetric and Square-Wave Anodic Stripping Determination of Amlodipine Besylate on Gold Electrode
EP  - 2303
IS  - 3
SP  - 2288
VL  - 7
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1984
ER  - 
@article{
author = "Stoiljković, Zora Ž. and Avramov-Ivić, Milka and Petrović, Slobodan and Mijin, Dušan and Stevanović, Sanja and Lačnjevac, Uroš and Marinković, Aleksandar",
year = "2012",
abstract = "The oxidative behaviour of amlodipine besylate was studied. The gold electrode and Au/o-MWCNT (oxidized multi-wall carbon nanotubes) were used for determination of amlodipine besylate standard and as a content of Alopres tablet, in 0.05 M NaHCO3 and in phosphate buffer (pH=11) by cyclic voltammetry and square-wave anodic stripping voltammetry. Electrode surfaces were characterized by AFM in the presence of amlodipine and the concentrations of drugs in electrolytes were simultaneously followed by HPLC. The linear dependency of the anodic currents of amlodipine besylate as standard and in Alopres tablet vs. concentration was observed in both electrolytes, but in phosphate buffer for the higher concentrations. The peak currents obtained in all experiments are more than fifty-fold higher comparing to all previously published results concerning the glassy carbon electrode and the carbon paste electrode. The gold electrode is better catalyst for anodic oxidation of amlodipine besylate than glassy carbone. The results obtained with Au/o-MWCNT show lower anodic activity comparing to previously published GC/o-MWCNT. GC/o-MWCNT is better catalyst than Au/o-MWCNT under similar experimental conditions.",
publisher = "Electrochemical Science Group, Beograd",
journal = "International Journal of Electrochemical Science",
title = "Voltammetric and Square-Wave Anodic Stripping Determination of Amlodipine Besylate on Gold Electrode",
pages = "2303-2288",
number = "3",
volume = "7",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1984"
}
Stoiljković, Z. Ž., Avramov-Ivić, M., Petrović, S., Mijin, D., Stevanović, S., Lačnjevac, U.,& Marinković, A.. (2012). Voltammetric and Square-Wave Anodic Stripping Determination of Amlodipine Besylate on Gold Electrode. in International Journal of Electrochemical Science
Electrochemical Science Group, Beograd., 7(3), 2288-2303.
https://hdl.handle.net/21.15107/rcub_technorep_1984
Stoiljković ZŽ, Avramov-Ivić M, Petrović S, Mijin D, Stevanović S, Lačnjevac U, Marinković A. Voltammetric and Square-Wave Anodic Stripping Determination of Amlodipine Besylate on Gold Electrode. in International Journal of Electrochemical Science. 2012;7(3):2288-2303.
https://hdl.handle.net/21.15107/rcub_technorep_1984 .
Stoiljković, Zora Ž., Avramov-Ivić, Milka, Petrović, Slobodan, Mijin, Dušan, Stevanović, Sanja, Lačnjevac, Uroš, Marinković, Aleksandar, "Voltammetric and Square-Wave Anodic Stripping Determination of Amlodipine Besylate on Gold Electrode" in International Journal of Electrochemical Science, 7, no. 3 (2012):2288-2303,
https://hdl.handle.net/21.15107/rcub_technorep_1984 .
38
40

On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions

Jović, Borka; Lačnjevac, Uroš; Jović, Vladimir; Gajić Krstajić, Ljiljana; Krstajić, Nedeljko

(Belgrade : Serbian Chemical Society, 2012)

TY  - JOUR
AU  - Jović, Borka
AU  - Lačnjevac, Uroš
AU  - Jović, Vladimir
AU  - Gajić Krstajić, Ljiljana
AU  - Krstajić, Nedeljko
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5719
AB  - MoO3 particles were co-deposited with Ni onto smooth or rough Ni supports from modified Watt’s baths of different compositions. Morphology and composition of the electrodeposits were characterized by means of cyclic voltammetry, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic activity of the composite catalysts for H2 evolution in alkaline solutions was determined by quasi-stationary polarization curves. Activity increases with MoOx content in the Ni deposit up to a limiting value. Composite Ni-MoOx catalyst performed high catalytic activity, similar to that of commercial Ni-RuO2 catalyst. Stability tests showed that Ni-MoOx codeposits are stable under condition of constant current and exhibit excellent tolerance to repeated short-circuiting.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions
EP  - 224
IS  - 2
SP  - 211
VL  - 77
DO  - 10.2298/JSC110621185J
UR  - https://hdl.handle.net/21.15107/rcub_dais_258
ER  - 
@article{
author = "Jović, Borka and Lačnjevac, Uroš and Jović, Vladimir and Gajić Krstajić, Ljiljana and Krstajić, Nedeljko",
year = "2012",
abstract = "MoO3 particles were co-deposited with Ni onto smooth or rough Ni supports from modified Watt’s baths of different compositions. Morphology and composition of the electrodeposits were characterized by means of cyclic voltammetry, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic activity of the composite catalysts for H2 evolution in alkaline solutions was determined by quasi-stationary polarization curves. Activity increases with MoOx content in the Ni deposit up to a limiting value. Composite Ni-MoOx catalyst performed high catalytic activity, similar to that of commercial Ni-RuO2 catalyst. Stability tests showed that Ni-MoOx codeposits are stable under condition of constant current and exhibit excellent tolerance to repeated short-circuiting.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions",
pages = "224-211",
number = "2",
volume = "77",
doi = "10.2298/JSC110621185J",
url = "https://hdl.handle.net/21.15107/rcub_dais_258"
}
Jović, B., Lačnjevac, U., Jović, V., Gajić Krstajić, L.,& Krstajić, N.. (2012). On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 77(2), 211-224.
https://doi.org/10.2298/JSC110621185J
https://hdl.handle.net/21.15107/rcub_dais_258
Jović B, Lačnjevac U, Jović V, Gajić Krstajić L, Krstajić N. On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions. in Journal of the Serbian Chemical Society. 2012;77(2):211-224.
doi:10.2298/JSC110621185J
https://hdl.handle.net/21.15107/rcub_dais_258 .
Jović, Borka, Lačnjevac, Uroš, Jović, Vladimir, Gajić Krstajić, Ljiljana, Krstajić, Nedeljko, "On the kinetics of the hydrogen evolution reaction on Ni-MoOx composite catalysts in alkaline solutions" in Journal of the Serbian Chemical Society, 77, no. 2 (2012):211-224,
https://doi.org/10.2298/JSC110621185J .,
https://hdl.handle.net/21.15107/rcub_dais_258 .
7
11

Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects

Jović, Vladimir D; Lačnjevac, Uroš; Jović, Borka M; Karanović, Ljiljana C.; Krstajić, Nedeljko V

(Pergamon-Elsevier Science Ltd, Oxford, 2012)

TY  - JOUR
AU  - Jović, Vladimir D
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Karanović, Ljiljana C.
AU  - Krstajić, Nedeljko V
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5718
AB  - In this work the hydrogen evolution reaction (HER) onto Ni-Sn alloy coatings deposited at different current densities from the bath containing 0.1 M Sn2+ and 0.1 M Ni2+ ions in the pyrophosphate-glycine solution, was investigated by polarization curves and electrochemical impedance spectroscopy (EIS) measurements. Their morphology and chemical composition were investigated by scanning electron microscopy equipped with an energy-dispersive X-ray spectroscopy (SEM-EDS), while the phase composition was investigated by X-ray powder diffraction (XRPD). It was shown that their chemical composition, phase composition and morphology depend on the deposition current density. In deposited samples all detected phases, face centered cubic (fcc) Ni, close packed (hcp) hexagonal Ni3Sn, hexagonal Ni(1-i-x)Sn (0  lt  x  lt  0.5) which adopts NiAs structure type and monoclinic Ni3Sn4 (CoSn structure type), were of low crystallinity. The increase of the Ni-Sn alloy coatings catalytic activity for HER in 6 M KOH with increasing the deposition current density was shown to be the consequence of the change of all three parameters: chemical composition, phase composition and morphology, with the effect of morphology being the most pronounced.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects
EP  - 17891
IS  - 23
SP  - 17882
VL  - 37
DO  - 10.1016/j.ijhydene.2012.09.110
ER  - 
@article{
author = "Jović, Vladimir D and Lačnjevac, Uroš and Jović, Borka M and Karanović, Ljiljana C. and Krstajić, Nedeljko V",
year = "2012",
abstract = "In this work the hydrogen evolution reaction (HER) onto Ni-Sn alloy coatings deposited at different current densities from the bath containing 0.1 M Sn2+ and 0.1 M Ni2+ ions in the pyrophosphate-glycine solution, was investigated by polarization curves and electrochemical impedance spectroscopy (EIS) measurements. Their morphology and chemical composition were investigated by scanning electron microscopy equipped with an energy-dispersive X-ray spectroscopy (SEM-EDS), while the phase composition was investigated by X-ray powder diffraction (XRPD). It was shown that their chemical composition, phase composition and morphology depend on the deposition current density. In deposited samples all detected phases, face centered cubic (fcc) Ni, close packed (hcp) hexagonal Ni3Sn, hexagonal Ni(1-i-x)Sn (0  lt  x  lt  0.5) which adopts NiAs structure type and monoclinic Ni3Sn4 (CoSn structure type), were of low crystallinity. The increase of the Ni-Sn alloy coatings catalytic activity for HER in 6 M KOH with increasing the deposition current density was shown to be the consequence of the change of all three parameters: chemical composition, phase composition and morphology, with the effect of morphology being the most pronounced.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects",
pages = "17891-17882",
number = "23",
volume = "37",
doi = "10.1016/j.ijhydene.2012.09.110"
}
Jović, V. D., Lačnjevac, U., Jović, B. M., Karanović, L. C.,& Krstajić, N. V.. (2012). Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 37(23), 17882-17891.
https://doi.org/10.1016/j.ijhydene.2012.09.110
Jović VD, Lačnjevac U, Jović BM, Karanović LC, Krstajić NV. Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects. in International Journal of Hydrogen Energy. 2012;37(23):17882-17891.
doi:10.1016/j.ijhydene.2012.09.110 .
Jović, Vladimir D, Lačnjevac, Uroš, Jović, Borka M, Karanović, Ljiljana C., Krstajić, Nedeljko V, "Ni-Sn coatings as cathodes for hydrogen evolution in alkaline solution. Chemical composition, phase composition and morphology effects" in International Journal of Hydrogen Energy, 37, no. 23 (2012):17882-17891,
https://doi.org/10.1016/j.ijhydene.2012.09.110 . .
33
24
35

Service life test of non-noble metal composite cathodes for hydrogen evolution in sodium hydroxide solution

Jović, Vladimir D; Lačnjevac, Uroš; Jović, Borka M; Krstajić, Nedeljko V

(Pergamon-Elsevier Science Ltd, Oxford, 2012)

TY  - JOUR
AU  - Jović, Vladimir D
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Krstajić, Nedeljko V
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5738
AB  - In this work polarization characteristics and "service life" test of the non-noble metal composite coatings Ni-MoOx and Ni-MoO2 for hydrogen evolution reaction (HER) in 32 wt.% NaOH at 90 degrees C were investigated and compared with that recorded for De Nora's commercial Ni + RuO2 cathode coating (DN). It was shown that under conditions of industrial application in the "zero-gap" membrane cells the lowest over-voltage for HER has been recorded for the Ni-MoO2 coating. At the same time the "service life" test was performed on all three electrodes in the same solution. This test was based on monitoring the current density response before and after repetitive cycling of these electrodes with 50 mV s(-1) in the potential range from hydrogen (-1.25 V vs. SCE) to oxygen (0.50 V vs. SCE) evolution. It was shown that the activity for all electrodes at the end of a "service life" test dropped to approximately 54% of the initial value, being comparable with the results obtained for Pt-based cathodes. The SEM-EDS analysis of the electrodes after the "service life" test showed that the Ni-MoO2 is much more stable than the Ni-MoOx composite coating and could be promising replacement for the commercial cathode.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Service life test of non-noble metal composite cathodes for hydrogen evolution in sodium hydroxide solution
EP  - 130
SP  - 124
VL  - 63
DO  - 10.1016/j.electacta.2011.12.078
ER  - 
@article{
author = "Jović, Vladimir D and Lačnjevac, Uroš and Jović, Borka M and Krstajić, Nedeljko V",
year = "2012",
abstract = "In this work polarization characteristics and "service life" test of the non-noble metal composite coatings Ni-MoOx and Ni-MoO2 for hydrogen evolution reaction (HER) in 32 wt.% NaOH at 90 degrees C were investigated and compared with that recorded for De Nora's commercial Ni + RuO2 cathode coating (DN). It was shown that under conditions of industrial application in the "zero-gap" membrane cells the lowest over-voltage for HER has been recorded for the Ni-MoO2 coating. At the same time the "service life" test was performed on all three electrodes in the same solution. This test was based on monitoring the current density response before and after repetitive cycling of these electrodes with 50 mV s(-1) in the potential range from hydrogen (-1.25 V vs. SCE) to oxygen (0.50 V vs. SCE) evolution. It was shown that the activity for all electrodes at the end of a "service life" test dropped to approximately 54% of the initial value, being comparable with the results obtained for Pt-based cathodes. The SEM-EDS analysis of the electrodes after the "service life" test showed that the Ni-MoO2 is much more stable than the Ni-MoOx composite coating and could be promising replacement for the commercial cathode.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Service life test of non-noble metal composite cathodes for hydrogen evolution in sodium hydroxide solution",
pages = "130-124",
volume = "63",
doi = "10.1016/j.electacta.2011.12.078"
}
Jović, V. D., Lačnjevac, U., Jović, B. M.,& Krstajić, N. V.. (2012). Service life test of non-noble metal composite cathodes for hydrogen evolution in sodium hydroxide solution. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 63, 124-130.
https://doi.org/10.1016/j.electacta.2011.12.078
Jović VD, Lačnjevac U, Jović BM, Krstajić NV. Service life test of non-noble metal composite cathodes for hydrogen evolution in sodium hydroxide solution. in Electrochimica Acta. 2012;63:124-130.
doi:10.1016/j.electacta.2011.12.078 .
Jović, Vladimir D, Lačnjevac, Uroš, Jović, Borka M, Krstajić, Nedeljko V, "Service life test of non-noble metal composite cathodes for hydrogen evolution in sodium hydroxide solution" in Electrochimica Acta, 63 (2012):124-130,
https://doi.org/10.1016/j.electacta.2011.12.078 . .
19
14
22

Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni-MoO2 composite coating in alkaline solution

Lačnjevac, Uroš; Jović, Borka M; Jović, Vladimir D; Krstajić, Nedeljko V

(Elsevier Science Sa, Lausanne, 2012)

TY  - JOUR
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Jović, Vladimir D
AU  - Krstajić, Nedeljko V
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5680
AB  - As a result of research on the non-noble metal-based composite electrocatalysts for the hydrogen evolution reaction (HER), the Ni-MoO2 composite coating was produced by electrodeposition from an NH4Cl and NiCl2 containing solution with suspended MoO2 powder particles, exhibiting almost the identical activity for the HER as the commercial cathode in conditions of industrial application and satisfactory mechanical stability. In this work, investigations were extended to the kinetics and mechanism of the HER on the Ni-MoO2 electrode in 8 M NaOH solution at 30 degrees C. The steady-state polarization curve for the HER was characterized by only one Tafel slope of -122 mV/dec. Kinetic parameters for the HER, as well as a contribution of surface roughness to the catalytic activity, were evaluated using an electrochemical impedance spectroscopy (EIS) technique. On the basis of the presented theoretical model for the faradaic impedance of the HER, the rate constants of the individual steps were determined by simulating both polarization and EIS experimental data. It was found that the reaction equally proceeds via the Volmer-Heyrovsky and Volmer-Tafel routes at lower overpotentials, while at higher overpotentials the Volmer-Heyrovsky pathway dominates the process with the Heyrovsky step being the rate determining step (rds). A comparison of intrinsic activities of the Ni-MoO2 composite and a flat Ni electrode proved that the combination of Ni and MoO2 produced a true catalytic effect for the HER.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni-MoO2 composite coating in alkaline solution
EP  - 40
SP  - 31
VL  - 677
DO  - 10.1016/j.jelechem.2012.05.004
ER  - 
@article{
author = "Lačnjevac, Uroš and Jović, Borka M and Jović, Vladimir D and Krstajić, Nedeljko V",
year = "2012",
abstract = "As a result of research on the non-noble metal-based composite electrocatalysts for the hydrogen evolution reaction (HER), the Ni-MoO2 composite coating was produced by electrodeposition from an NH4Cl and NiCl2 containing solution with suspended MoO2 powder particles, exhibiting almost the identical activity for the HER as the commercial cathode in conditions of industrial application and satisfactory mechanical stability. In this work, investigations were extended to the kinetics and mechanism of the HER on the Ni-MoO2 electrode in 8 M NaOH solution at 30 degrees C. The steady-state polarization curve for the HER was characterized by only one Tafel slope of -122 mV/dec. Kinetic parameters for the HER, as well as a contribution of surface roughness to the catalytic activity, were evaluated using an electrochemical impedance spectroscopy (EIS) technique. On the basis of the presented theoretical model for the faradaic impedance of the HER, the rate constants of the individual steps were determined by simulating both polarization and EIS experimental data. It was found that the reaction equally proceeds via the Volmer-Heyrovsky and Volmer-Tafel routes at lower overpotentials, while at higher overpotentials the Volmer-Heyrovsky pathway dominates the process with the Heyrovsky step being the rate determining step (rds). A comparison of intrinsic activities of the Ni-MoO2 composite and a flat Ni electrode proved that the combination of Ni and MoO2 produced a true catalytic effect for the HER.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni-MoO2 composite coating in alkaline solution",
pages = "40-31",
volume = "677",
doi = "10.1016/j.jelechem.2012.05.004"
}
Lačnjevac, U., Jović, B. M., Jović, V. D.,& Krstajić, N. V.. (2012). Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni-MoO2 composite coating in alkaline solution. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 677, 31-40.
https://doi.org/10.1016/j.jelechem.2012.05.004
Lačnjevac U, Jović BM, Jović VD, Krstajić NV. Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni-MoO2 composite coating in alkaline solution. in Journal of Electroanalytical Chemistry. 2012;677:31-40.
doi:10.1016/j.jelechem.2012.05.004 .
Lačnjevac, Uroš, Jović, Borka M, Jović, Vladimir D, Krstajić, Nedeljko V, "Determination of kinetic parameters for the hydrogen evolution reaction on the electrodeposited Ni-MoO2 composite coating in alkaline solution" in Journal of Electroanalytical Chemistry, 677 (2012):31-40,
https://doi.org/10.1016/j.jelechem.2012.05.004 . .
36
23
43

Non-noble metal composite cathodes for hydrogen evolution. Part II: The Ni-MoO2 coatings electrodeposited from nickel chloride-ammonium chloride bath containing MoO2 powder particles

Krstajić, Nedeljko V; Lačnjevac, Uroš; Jović, Borka M; Mora, S; Jović, Vladimir D

(Pergamon-Elsevier Science Ltd, Oxford, 2011)

TY  - JOUR
AU  - Krstajić, Nedeljko V
AU  - Lačnjevac, Uroš
AU  - Jović, Borka M
AU  - Mora, S
AU  - Jović, Vladimir D
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5647
AB  - In this work the procedure of the deposition of composite Ni-MoO2 coatings onto Ni mesh from the nickel chloride-ammonium chloride electrolyte containing suspended MoO2 powder particles, under simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni-MoO2 coatings were investigated in the 32 wt.% NaOH at 90 degrees C and compared with the one recorded for the commercial De Nora's coating (DN). It was shown that the best Ni-MoO2 coating posses identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO2 powder particles were occluded by the Ni deposit, being uniformly distributed in the deposit.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - Non-noble metal composite cathodes for hydrogen evolution. Part II: The Ni-MoO2 coatings electrodeposited from nickel chloride-ammonium chloride bath containing MoO2 powder particles
EP  - 6461
IS  - 11
SP  - 6450
VL  - 36
DO  - 10.1016/j.ijhydene.2011.02.106
ER  - 
@article{
author = "Krstajić, Nedeljko V and Lačnjevac, Uroš and Jović, Borka M and Mora, S and Jović, Vladimir D",
year = "2011",
abstract = "In this work the procedure of the deposition of composite Ni-MoO2 coatings onto Ni mesh from the nickel chloride-ammonium chloride electrolyte containing suspended MoO2 powder particles, under simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni-MoO2 coatings were investigated in the 32 wt.% NaOH at 90 degrees C and compared with the one recorded for the commercial De Nora's coating (DN). It was shown that the best Ni-MoO2 coating posses identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO2 powder particles were occluded by the Ni deposit, being uniformly distributed in the deposit.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "Non-noble metal composite cathodes for hydrogen evolution. Part II: The Ni-MoO2 coatings electrodeposited from nickel chloride-ammonium chloride bath containing MoO2 powder particles",
pages = "6461-6450",
number = "11",
volume = "36",
doi = "10.1016/j.ijhydene.2011.02.106"
}
Krstajić, N. V., Lačnjevac, U., Jović, B. M., Mora, S.,& Jović, V. D.. (2011). Non-noble metal composite cathodes for hydrogen evolution. Part II: The Ni-MoO2 coatings electrodeposited from nickel chloride-ammonium chloride bath containing MoO2 powder particles. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 36(11), 6450-6461.
https://doi.org/10.1016/j.ijhydene.2011.02.106
Krstajić NV, Lačnjevac U, Jović BM, Mora S, Jović VD. Non-noble metal composite cathodes for hydrogen evolution. Part II: The Ni-MoO2 coatings electrodeposited from nickel chloride-ammonium chloride bath containing MoO2 powder particles. in International Journal of Hydrogen Energy. 2011;36(11):6450-6461.
doi:10.1016/j.ijhydene.2011.02.106 .
Krstajić, Nedeljko V, Lačnjevac, Uroš, Jović, Borka M, Mora, S, Jović, Vladimir D, "Non-noble metal composite cathodes for hydrogen evolution. Part II: The Ni-MoO2 coatings electrodeposited from nickel chloride-ammonium chloride bath containing MoO2 powder particles" in International Journal of Hydrogen Energy, 36, no. 11 (2011):6450-6461,
https://doi.org/10.1016/j.ijhydene.2011.02.106 . .
41
37
47

Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles

Krstajić, Nedeljko; Gajić Krstajić, Ljiljana; Lačnjevac, Uroš; Jović, Borka; Mora, S.; Jović, Vladimir

(Elsevier, 2011)

TY  - JOUR
AU  - Krstajić, Nedeljko
AU  - Gajić Krstajić, Ljiljana
AU  - Lačnjevac, Uroš
AU  - Jović, Borka
AU  - Mora, S.
AU  - Jović, Vladimir
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5646
AB  - In this work the Ni–MoOx coatings have been prepared and characterized in view of their possible application as electrocatalysts for hydrogen evolution reaction (HER) in alkaline solution. The procedure of deposition of Ni–MoOx coatings from the Watt’s type bath containing MoO3 powder particles onto Ni mesh, under the conditions of simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni–MoOx coatings were investigated in the 32 wt.% NaOH at 90 °C and compared with the one recorded for the commercial De Nora’s coating (DN). It was shown that the best Ni–MoOx coating exhibits almost identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO3 powder particles were not occluded by the Ni deposit and that molybdenum species were deposited from the molybdate ions formed by dissolution of MoO3, following the mechanism of induced co-deposition. The reaction mechanism for MoO3 phase deposition has also been proposed.
PB  - Elsevier
T2  - International Journal of Hydrogen Energy
T1  - Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles
EP  - 6449
SP  - 6441
DO  - 10.1016/j.ijhydene.2011.02.105
UR  - https://hdl.handle.net/21.15107/rcub_dais_709
ER  - 
@article{
author = "Krstajić, Nedeljko and Gajić Krstajić, Ljiljana and Lačnjevac, Uroš and Jović, Borka and Mora, S. and Jović, Vladimir",
year = "2011",
abstract = "In this work the Ni–MoOx coatings have been prepared and characterized in view of their possible application as electrocatalysts for hydrogen evolution reaction (HER) in alkaline solution. The procedure of deposition of Ni–MoOx coatings from the Watt’s type bath containing MoO3 powder particles onto Ni mesh, under the conditions of simulated industrial deposition conditions for commercial cathodes, has been presented. The morphology of the obtained coatings was investigated by SEM, the composition by EDS and the phase composition by XRD techniques. The polarization characteristics for hydrogen evolution on the obtained Ni–MoOx coatings were investigated in the 32 wt.% NaOH at 90 °C and compared with the one recorded for the commercial De Nora’s coating (DN). It was shown that the best Ni–MoOx coating exhibits almost identical polarization characteristics as the commercial one. By the cross section and XRD analysis of deposited samples it was confirmed that MoO3 powder particles were not occluded by the Ni deposit and that molybdenum species were deposited from the molybdate ions formed by dissolution of MoO3, following the mechanism of induced co-deposition. The reaction mechanism for MoO3 phase deposition has also been proposed.",
publisher = "Elsevier",
journal = "International Journal of Hydrogen Energy",
title = "Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles",
pages = "6449-6441",
doi = "10.1016/j.ijhydene.2011.02.105",
url = "https://hdl.handle.net/21.15107/rcub_dais_709"
}
Krstajić, N., Gajić Krstajić, L., Lačnjevac, U., Jović, B., Mora, S.,& Jović, V.. (2011). Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles. in International Journal of Hydrogen Energy
Elsevier., 6441-6449.
https://doi.org/10.1016/j.ijhydene.2011.02.105
https://hdl.handle.net/21.15107/rcub_dais_709
Krstajić N, Gajić Krstajić L, Lačnjevac U, Jović B, Mora S, Jović V. Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles. in International Journal of Hydrogen Energy. 2011;:6441-6449.
doi:10.1016/j.ijhydene.2011.02.105
https://hdl.handle.net/21.15107/rcub_dais_709 .
Krstajić, Nedeljko, Gajić Krstajić, Ljiljana, Lačnjevac, Uroš, Jović, Borka, Mora, S., Jović, Vladimir, "Non-noble metal composite cathodes for hydrogen evolution. Part I: The Ni–MoOx coatings electrodeposited from Watt’s type bath containing MoO3 powder particles" in International Journal of Hydrogen Energy (2011):6441-6449,
https://doi.org/10.1016/j.ijhydene.2011.02.105 .,
https://hdl.handle.net/21.15107/rcub_dais_709 .
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Voltammetric and differential pulse determination of roxithromycin

Drljević-Đurić, Katica; Jović, Vladimir D.; Lačnjevac, Uroš; Avramov-Ivić, Milka; Petrović, Slobodan; Mijin, Dušan; Đorđević, S. B.

(Pergamon-Elsevier Science Ltd, Oxford, 2010)

TY  - JOUR
AU  - Drljević-Đurić, Katica
AU  - Jović, Vladimir D.
AU  - Lačnjevac, Uroš
AU  - Avramov-Ivić, Milka
AU  - Petrović, Slobodan
AU  - Mijin, Dušan
AU  - Đorđević, S. B.
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1718
AB  - The oxidative behavior of antibiotic roxithromycin standard was studied at a gold electrode in 0.05 M NaHCO3 using cyclic linear sweep voltammetry and differential pulse voltammetry. It was found that the value of the oxidative peak of pure roxithromycin at 0.81 V vs. SCE in 0.05 M NaHCO3 at a scan rate of 50 mV s(-1) is a linear function of the concentration in a range 0.10006-0.654 mg cm(-3). It was also found that peak current density at 0.75 V vs. SCE at a scan rate of 2 mVs(-1), pulse amplitude of 25 mV and pulse time of 0.1 s exhibits linear dependence on the concentration of roxithromycin from 0.1006 to 0.476 mg cm(-3). Roxithromycin as a content of solid dosage form and urine was quantitatively determined and the obtained results were checked by HPLC.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Voltammetric and differential pulse determination of roxithromycin
EP  - 52
IS  - 1
SP  - 47
VL  - 56
DO  - 10.1016/j.electacta.2010.09.067
ER  - 
@article{
author = "Drljević-Đurić, Katica and Jović, Vladimir D. and Lačnjevac, Uroš and Avramov-Ivić, Milka and Petrović, Slobodan and Mijin, Dušan and Đorđević, S. B.",
year = "2010",
abstract = "The oxidative behavior of antibiotic roxithromycin standard was studied at a gold electrode in 0.05 M NaHCO3 using cyclic linear sweep voltammetry and differential pulse voltammetry. It was found that the value of the oxidative peak of pure roxithromycin at 0.81 V vs. SCE in 0.05 M NaHCO3 at a scan rate of 50 mV s(-1) is a linear function of the concentration in a range 0.10006-0.654 mg cm(-3). It was also found that peak current density at 0.75 V vs. SCE at a scan rate of 2 mVs(-1), pulse amplitude of 25 mV and pulse time of 0.1 s exhibits linear dependence on the concentration of roxithromycin from 0.1006 to 0.476 mg cm(-3). Roxithromycin as a content of solid dosage form and urine was quantitatively determined and the obtained results were checked by HPLC.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Voltammetric and differential pulse determination of roxithromycin",
pages = "52-47",
number = "1",
volume = "56",
doi = "10.1016/j.electacta.2010.09.067"
}
Drljević-Đurić, K., Jović, V. D., Lačnjevac, U., Avramov-Ivić, M., Petrović, S., Mijin, D.,& Đorđević, S. B.. (2010). Voltammetric and differential pulse determination of roxithromycin. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 56(1), 47-52.
https://doi.org/10.1016/j.electacta.2010.09.067
Drljević-Đurić K, Jović VD, Lačnjevac U, Avramov-Ivić M, Petrović S, Mijin D, Đorđević SB. Voltammetric and differential pulse determination of roxithromycin. in Electrochimica Acta. 2010;56(1):47-52.
doi:10.1016/j.electacta.2010.09.067 .
Drljević-Đurić, Katica, Jović, Vladimir D., Lačnjevac, Uroš, Avramov-Ivić, Milka, Petrović, Slobodan, Mijin, Dušan, Đorđević, S. B., "Voltammetric and differential pulse determination of roxithromycin" in Electrochimica Acta, 56, no. 1 (2010):47-52,
https://doi.org/10.1016/j.electacta.2010.09.067 . .
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