TY  - JOUR
AU  - Košević, Milica
AU  - Šekularac, Gavrilo
AU  - Živković, Ljiljana S.
AU  - Panić, Vladimir
AU  - Nikolic, Branislav
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5858
AB  - TiO2 powder was synthesized by a forced hydrolysis process and used for the synthesis of Pt/TiO2 composite that is to be foreseen as an advanced electrode material. Pt was incorporated into the synthesized TiO2 from a Pt colloidal dispersion as a precursor prepared by a microwave- assisted polyol process. Physicochemical properties of TiO2 and TiO2- supported Pt were investigated by scanning electron microscopy, dynamic light scattering and X- ray spectroscopy and diffraction techniques. The properties of Pt/TiO2 composite are correlated to the basic voltammetric response of its thin-layer form. It was found that subsequent thermal treatment of synthesized TiO2, which caused crystallization into mainly rutile phase, is required for appropriate Pt incorporation. Although being appropriately loaded by Pt, and the voltammetric response is typical for Pt-based material, the voltammetry of Pt/TiO2 corresponded to much lower loadings.The possibility for Pt particles to be trapped inside TiO2 agglomerates is indicated. The catalyst usage from the synthesized Pt/TiO2 was found quite moderate due to this trapping.
PB  - Croatian Chemical Society
T2  - Croatica Chemica Acta
T1  - TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications
EP  - 258
IS  - 2
SP  - 251
VL  - 90
DO  - 10.5562/cca3175
ER  - 

@article{
author = "Košević, Milica and Šekularac, Gavrilo and Živković, Ljiljana S. and Panić, Vladimir and Nikolic, Branislav",
year = "2017",
abstract = "TiO2 powder was synthesized by a forced hydrolysis process and used for the synthesis of Pt/TiO2 composite that is to be foreseen as an advanced electrode material. Pt was incorporated into the synthesized TiO2 from a Pt colloidal dispersion as a precursor prepared by a microwave- assisted polyol process. Physicochemical properties of TiO2 and TiO2- supported Pt were investigated by scanning electron microscopy, dynamic light scattering and X- ray spectroscopy and diffraction techniques. The properties of Pt/TiO2 composite are correlated to the basic voltammetric response of its thin-layer form. It was found that subsequent thermal treatment of synthesized TiO2, which caused crystallization into mainly rutile phase, is required for appropriate Pt incorporation. Although being appropriately loaded by Pt, and the voltammetric response is typical for Pt-based material, the voltammetry of Pt/TiO2 corresponded to much lower loadings.The possibility for Pt particles to be trapped inside TiO2 agglomerates is indicated. The catalyst usage from the synthesized Pt/TiO2 was found quite moderate due to this trapping.",
publisher = "Croatian Chemical Society",
journal = "Croatica Chemica Acta",
title = "TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications",
pages = "258-251",
number = "2",
volume = "90",
doi = "10.5562/cca3175"
}

Košević, M., Šekularac, G., Živković, L. S., Panić, V.,& Nikolic, B.. (2017). TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications. in Croatica Chemica Acta
Croatian Chemical Society., 90(2), 251-258.
https://doi.org/10.5562/cca3175

Košević M, Šekularac G, Živković LS, Panić V, Nikolic B. TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications. in Croatica Chemica Acta. 2017;90(2):251-258.
doi:10.5562/cca3175 .

Košević, Milica, Šekularac, Gavrilo, Živković, Ljiljana S., Panić, Vladimir, Nikolic, Branislav, "TiO2 From Colloidal Dispersion as Support in Pt/TiO2 Nanocomposite for Electrochemical Applications" in Croatica Chemica Acta, 90, no. 2 (2017):251-258,
https://doi.org/10.5562/cca3175 . .

TY  - JOUR
AU  - Panić, Vladimir
AU  - Dekanski, Aleksandar
AU  - Nikolic, Branislav Z.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5721
AB  - Porous electrochemical supercapacitive materials, as an important type of new-generation energy storage devices, require detailed analysis and knowledge of their capacitive performances under different charging/discharging regimes. An investigation of the responses to dynamic perturbations of typical representatives, noble metal oxides, carbonaceous materials and RuO2-impregnated carbon blacks, by electrochemical impedance spectroscopy (EIS) is presented. This presentation follows a brief description of supercapacitive behavior and origin of pseudo-capacitive response of noble metal oxides. For all the investigated materials, the electrical charging/discharging equivalent of the EIS response was found to obey the transmission line model envisaged as a so-called 'resistor/capacitor (RC) ladder'. The ladder features are correlated to material physicochemical properties, its composition and the composition of the electrolyte. Fitting of the EIS data of different supercapacitive materials to appropriate RC ladders enables in-depth profiling of the capacitance and pore resistance of their porous thin-layers and finally the complete revelation of capacitive energy storage issues. .
AB  - Istraživanja poroznih elektrohemijskih superkondenzatorskih materijala, kao važne vrste uređaja za skladištenje energije nove generacije, zahtevaju detaljnu analizu i poznavanje njihovih kondenzatorskih odlika pri različitim režimima punjenje/pražnjenje. Prikazani su rezultati ovih istraživanja, u formi odgovora na dinamičku pobudu, tipičnih predstavnika ovih materijala: oksida plemenitih metala, ugljeničnih materijala i ugljeničnih prahova impregniranih oksidom rutenijuma, koji su dobijeni spektroskopijom elektrohemijske impedancije (SEI). Ovom prikazu predhodi sažet opis superkondenzatorskog ponašanja i porekla pseudokondenzatorkog odgovora oksida plemenitih metala. Električni ekvivalent pri punjenju/pražnjenju svih ispitivanih materijala odgovara modelu transmisione linije predstavljene tzv. 'otpornik/kondezator (RC) lestvicom'. Odlike lestvice su korelisane sa fizičko-hemijskim svojstvima materijala, njihovim sastavom, kao i sa sastavom elektrolita. Usklađivanje SEI podataka različitih superkondenzatorskih materijala sa odgovarajućom RC lestvicom omogućava analizu raspodele kapacitivnosti i otpornosti u porama kroz tanki porozni sloj materijala i konačno rasvetljavanje odlika superkondenzatorskog tipa skladištenja energije. .
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Tailoring the supercapacitive performances of noble metal oxides, porous carbons and their composites
T1  - Rasvetljavanje superkondenzatorskih odlika oksida plemenitih metala, poroznih ugljeničnih materijala i njihovih kompozita
EP  - 2164
IS  - 12
SP  - 2141
VL  - 78
DO  - 10.2298/JSC131031128P
ER  - 

@article{
author = "Panić, Vladimir and Dekanski, Aleksandar and Nikolic, Branislav Z.",
year = "2013",
abstract = "Porous electrochemical supercapacitive materials, as an important type of new-generation energy storage devices, require detailed analysis and knowledge of their capacitive performances under different charging/discharging regimes. An investigation of the responses to dynamic perturbations of typical representatives, noble metal oxides, carbonaceous materials and RuO2-impregnated carbon blacks, by electrochemical impedance spectroscopy (EIS) is presented. This presentation follows a brief description of supercapacitive behavior and origin of pseudo-capacitive response of noble metal oxides. For all the investigated materials, the electrical charging/discharging equivalent of the EIS response was found to obey the transmission line model envisaged as a so-called 'resistor/capacitor (RC) ladder'. The ladder features are correlated to material physicochemical properties, its composition and the composition of the electrolyte. Fitting of the EIS data of different supercapacitive materials to appropriate RC ladders enables in-depth profiling of the capacitance and pore resistance of their porous thin-layers and finally the complete revelation of capacitive energy storage issues. ., Istraživanja poroznih elektrohemijskih superkondenzatorskih materijala, kao važne vrste uređaja za skladištenje energije nove generacije, zahtevaju detaljnu analizu i poznavanje njihovih kondenzatorskih odlika pri različitim režimima punjenje/pražnjenje. Prikazani su rezultati ovih istraživanja, u formi odgovora na dinamičku pobudu, tipičnih predstavnika ovih materijala: oksida plemenitih metala, ugljeničnih materijala i ugljeničnih prahova impregniranih oksidom rutenijuma, koji su dobijeni spektroskopijom elektrohemijske impedancije (SEI). Ovom prikazu predhodi sažet opis superkondenzatorskog ponašanja i porekla pseudokondenzatorkog odgovora oksida plemenitih metala. Električni ekvivalent pri punjenju/pražnjenju svih ispitivanih materijala odgovara modelu transmisione linije predstavljene tzv. 'otpornik/kondezator (RC) lestvicom'. Odlike lestvice su korelisane sa fizičko-hemijskim svojstvima materijala, njihovim sastavom, kao i sa sastavom elektrolita. Usklađivanje SEI podataka različitih superkondenzatorskih materijala sa odgovarajućom RC lestvicom omogućava analizu raspodele kapacitivnosti i otpornosti u porama kroz tanki porozni sloj materijala i konačno rasvetljavanje odlika superkondenzatorskog tipa skladištenja energije. .",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Tailoring the supercapacitive performances of noble metal oxides, porous carbons and their composites, Rasvetljavanje superkondenzatorskih odlika oksida plemenitih metala, poroznih ugljeničnih materijala i njihovih kompozita",
pages = "2164-2141",
number = "12",
volume = "78",
doi = "10.2298/JSC131031128P"
}

Panić, V., Dekanski, A.,& Nikolic, B. Z.. (2013). Tailoring the supercapacitive performances of noble metal oxides, porous carbons and their composites. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 78(12), 2141-2164.
https://doi.org/10.2298/JSC131031128P

Panić V, Dekanski A, Nikolic BZ. Tailoring the supercapacitive performances of noble metal oxides, porous carbons and their composites. in Journal of the Serbian Chemical Society. 2013;78(12):2141-2164.
doi:10.2298/JSC131031128P .

Panić, Vladimir, Dekanski, Aleksandar, Nikolic, Branislav Z., "Tailoring the supercapacitive performances of noble metal oxides, porous carbons and their composites" in Journal of the Serbian Chemical Society, 78, no. 12 (2013):2141-2164,
https://doi.org/10.2298/JSC131031128P . .

TY  - JOUR
AU  - Nikolic, Branislav Z.
AU  - Panić, Vladimir
AU  - Dekanski, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5693
AB  - The electrochemical properties of a sol-gel-prepared IrO2-TiO2 coating on Ti were investigated from the standpoint of the charging/discharging behavior in 1.0A degrees mol dm(-3) H2SO4 and in 0.50A degrees mol dm(-3) NaCl, pH 2. The potential-dependent changes from low oxidation states of Ir, with low activity, to those of higher activity (enhanced pseudocapacitive performances) were analyzed at different charging/discharging rates by cyclic voltammetry and electrochemical impedance spectroscopy. The results showed the distribution of Ir oxidation states through the coating, with lower ones being placed largely in the internal, hardly accessible, parts of the coating. The transition to higher oxidation states appears as crucial for the full development of pseudocapacitive performances. This transition occurs much easier in the NaCl than in the H2SO4 solution, since the potentials of redox transitions of Ir are much closer due to lower hydrogen ion concentration in NaCl solution. As a consequence, a unique overall coating capacitance was registered in both solutions.
PB  - Springer, New York
T2  - Electrocatalysis
T1  - Intrinsic Potential-Dependent Performances of a Sol-Gel-Prepared Electrocatalytic IrO2-TiO2 Coating of Dimensionally Stable Anodes
EP  - 368
IS  - 3-4
SP  - 360
VL  - 3
DO  - 10.1007/s12678-012-0086-1
ER  - 

@article{
author = "Nikolic, Branislav Z. and Panić, Vladimir and Dekanski, Aleksandar",
year = "2012",
abstract = "The electrochemical properties of a sol-gel-prepared IrO2-TiO2 coating on Ti were investigated from the standpoint of the charging/discharging behavior in 1.0A degrees mol dm(-3) H2SO4 and in 0.50A degrees mol dm(-3) NaCl, pH 2. The potential-dependent changes from low oxidation states of Ir, with low activity, to those of higher activity (enhanced pseudocapacitive performances) were analyzed at different charging/discharging rates by cyclic voltammetry and electrochemical impedance spectroscopy. The results showed the distribution of Ir oxidation states through the coating, with lower ones being placed largely in the internal, hardly accessible, parts of the coating. The transition to higher oxidation states appears as crucial for the full development of pseudocapacitive performances. This transition occurs much easier in the NaCl than in the H2SO4 solution, since the potentials of redox transitions of Ir are much closer due to lower hydrogen ion concentration in NaCl solution. As a consequence, a unique overall coating capacitance was registered in both solutions.",
publisher = "Springer, New York",
journal = "Electrocatalysis",
title = "Intrinsic Potential-Dependent Performances of a Sol-Gel-Prepared Electrocatalytic IrO2-TiO2 Coating of Dimensionally Stable Anodes",
pages = "368-360",
number = "3-4",
volume = "3",
doi = "10.1007/s12678-012-0086-1"
}

Nikolic, B. Z., Panić, V.,& Dekanski, A.. (2012). Intrinsic Potential-Dependent Performances of a Sol-Gel-Prepared Electrocatalytic IrO2-TiO2 Coating of Dimensionally Stable Anodes. in Electrocatalysis
Springer, New York., 3(3-4), 360-368.
https://doi.org/10.1007/s12678-012-0086-1

Nikolic BZ, Panić V, Dekanski A. Intrinsic Potential-Dependent Performances of a Sol-Gel-Prepared Electrocatalytic IrO2-TiO2 Coating of Dimensionally Stable Anodes. in Electrocatalysis. 2012;3(3-4):360-368.
doi:10.1007/s12678-012-0086-1 .

Nikolic, Branislav Z., Panić, Vladimir, Dekanski, Aleksandar, "Intrinsic Potential-Dependent Performances of a Sol-Gel-Prepared Electrocatalytic IrO2-TiO2 Coating of Dimensionally Stable Anodes" in Electrocatalysis, 3, no. 3-4 (2012):360-368,
https://doi.org/10.1007/s12678-012-0086-1 . .

TY  - JOUR
AU  - Panić, Vladimir V.
AU  - Nikolic, Branislav Z.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5529
AB  - The properties of activated titanium anodes, RuO2-TiO2/Ti and RuO2--TiO2-IrO2/Ti, prepared from oxide sols by the sol-gel procedure, are reviewed. RuO2 and TiO2 sols were synthesized by forced hydrolysis of the corresponding chlorides in acid medium. The morphology of the prepared sols was investigated by transmission electron microscopy. The chemical composition of the RuO2 sol was determined by X-ray diffraction and thermogravimetric analysis. The loss of electrocatalytic activity of a RuO2-TiO2/Ti anode during an accelerated stability test was investigated by examination of the changes in the electrochemical characteristics in the potential region of the chlorine and oxygen evolution reaction, as well as on the open circuit potential. These electrochemical characteristics were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and polarization measurements. The changes in electrochemical characteristics of the anode prepared by the sol-gel procedure were compared to the changes registered for an anode prepared by the traditional thermal decomposition of metal chlorides. The comparison indicated that the main cause for the activity loss of the sol-gel prepared anode was the electrochemical dissolution of RuO2, while in the case of thermally prepared anode the loss was mainly caused by the formation of an insulating TiO2 layer in the coating/Ti substrate interphase. The results of an accelerated stability test on RuO2-TiO2/Ti and RuO2--TiO2-IrO2/Ti anodes showed that the ternary coating is considerably more stable than the binary one, which is the consequence of the greater stability of IrO2 in comparison to RuO2.
AB  - U radu je dat je pregled svojstava aktiviranih titanskih anoda, RuO2-TiO2/Ti i RuO2--TiO2-IrO2/Ti, dobijenih sol-gel postupkom od neorganskih oksidnih solova. RuO2 i TiO2 solovi dobijeni su forsiranom hidrolizom odgovarajućih hlorida metala u kiseloj sredini. Morfologija dobijenih solova ispitivana je transmisionom elektronskom mikroskopijom. Hemijski sastav RuO2 sola ispitivan je difrakcijom x-zraka i termogravimetrijskom analizom. Mehanizam gubitka elektrokatalitičke aktivnosti RuO2-TiO2/Ti anoda ispitivan je praćenjem promena elektrohemijskih svojstava anode u reakcijama izdvajanja hlora i kiseonika, kao i na potencijalu otvorenog kola, tokom degradacije anode. Ove elektro-hemijske karakteristike anode ispitivane su metodama ciklične voltametrije, spektroskopije elektrohemijske impedancije i polarizacionim merenjima. Promene u elektrohemijskim svojstvima anode dobijene sol-gel postupkom poređene su sa promenama koje su registrovane za RuO2-TiO2/Ti anodu dobijenu tradicionalnim postupkom termičke razgradnje hlorida metala. Na osnovu ovih ispitivanja proizilazi da je osnovni uzrok gubitka elektrokatalitičke aktivnosti anode dobijene sol-gel postupkom elektrohemijsko rastvaranje RuO2, dok je uzrok degradacije anode dobijene termičkom razgradnjom rast neprovodnog TiO2 sloja u međufazi prevlaka/titanska podloga. Rezultati ubrzanog testa stabilnosti RuO2-TiO2/Ti i RuO2-TiO2-IrO2/Ti anode pokazuju da je trojna prevlaka znatno stabilnija od dvojne, zbog veće stabilnosti oksida iridijuma u poređenju sa oksidom rutenijuma.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Electrocatalytic properties and stability of titanium anodes activated by the inorganic sol-gel procedure
T1  - Titanske anode aktivirane oksidnom prevlakom dobijenom sol-gel postupkom
EP  - 1112
IS  - 11
SP  - 1083
VL  - 73
DO  - 10.2298/JSC0811083P
ER  - 

@article{
author = "Panić, Vladimir V. and Nikolic, Branislav Z.",
year = "2008",
abstract = "The properties of activated titanium anodes, RuO2-TiO2/Ti and RuO2--TiO2-IrO2/Ti, prepared from oxide sols by the sol-gel procedure, are reviewed. RuO2 and TiO2 sols were synthesized by forced hydrolysis of the corresponding chlorides in acid medium. The morphology of the prepared sols was investigated by transmission electron microscopy. The chemical composition of the RuO2 sol was determined by X-ray diffraction and thermogravimetric analysis. The loss of electrocatalytic activity of a RuO2-TiO2/Ti anode during an accelerated stability test was investigated by examination of the changes in the electrochemical characteristics in the potential region of the chlorine and oxygen evolution reaction, as well as on the open circuit potential. These electrochemical characteristics were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and polarization measurements. The changes in electrochemical characteristics of the anode prepared by the sol-gel procedure were compared to the changes registered for an anode prepared by the traditional thermal decomposition of metal chlorides. The comparison indicated that the main cause for the activity loss of the sol-gel prepared anode was the electrochemical dissolution of RuO2, while in the case of thermally prepared anode the loss was mainly caused by the formation of an insulating TiO2 layer in the coating/Ti substrate interphase. The results of an accelerated stability test on RuO2-TiO2/Ti and RuO2--TiO2-IrO2/Ti anodes showed that the ternary coating is considerably more stable than the binary one, which is the consequence of the greater stability of IrO2 in comparison to RuO2., U radu je dat je pregled svojstava aktiviranih titanskih anoda, RuO2-TiO2/Ti i RuO2--TiO2-IrO2/Ti, dobijenih sol-gel postupkom od neorganskih oksidnih solova. RuO2 i TiO2 solovi dobijeni su forsiranom hidrolizom odgovarajućih hlorida metala u kiseloj sredini. Morfologija dobijenih solova ispitivana je transmisionom elektronskom mikroskopijom. Hemijski sastav RuO2 sola ispitivan je difrakcijom x-zraka i termogravimetrijskom analizom. Mehanizam gubitka elektrokatalitičke aktivnosti RuO2-TiO2/Ti anoda ispitivan je praćenjem promena elektrohemijskih svojstava anode u reakcijama izdvajanja hlora i kiseonika, kao i na potencijalu otvorenog kola, tokom degradacije anode. Ove elektro-hemijske karakteristike anode ispitivane su metodama ciklične voltametrije, spektroskopije elektrohemijske impedancije i polarizacionim merenjima. Promene u elektrohemijskim svojstvima anode dobijene sol-gel postupkom poređene su sa promenama koje su registrovane za RuO2-TiO2/Ti anodu dobijenu tradicionalnim postupkom termičke razgradnje hlorida metala. Na osnovu ovih ispitivanja proizilazi da je osnovni uzrok gubitka elektrokatalitičke aktivnosti anode dobijene sol-gel postupkom elektrohemijsko rastvaranje RuO2, dok je uzrok degradacije anode dobijene termičkom razgradnjom rast neprovodnog TiO2 sloja u međufazi prevlaka/titanska podloga. Rezultati ubrzanog testa stabilnosti RuO2-TiO2/Ti i RuO2-TiO2-IrO2/Ti anode pokazuju da je trojna prevlaka znatno stabilnija od dvojne, zbog veće stabilnosti oksida iridijuma u poređenju sa oksidom rutenijuma.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Electrocatalytic properties and stability of titanium anodes activated by the inorganic sol-gel procedure, Titanske anode aktivirane oksidnom prevlakom dobijenom sol-gel postupkom",
pages = "1112-1083",
number = "11",
volume = "73",
doi = "10.2298/JSC0811083P"
}

Panić, V. V.,& Nikolic, B. Z.. (2008). Electrocatalytic properties and stability of titanium anodes activated by the inorganic sol-gel procedure. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 73(11), 1083-1112.
https://doi.org/10.2298/JSC0811083P

Panić VV, Nikolic BZ. Electrocatalytic properties and stability of titanium anodes activated by the inorganic sol-gel procedure. in Journal of the Serbian Chemical Society. 2008;73(11):1083-1112.
doi:10.2298/JSC0811083P .

Panić, Vladimir V., Nikolic, Branislav Z., "Electrocatalytic properties and stability of titanium anodes activated by the inorganic sol-gel procedure" in Journal of the Serbian Chemical Society, 73, no. 11 (2008):1083-1112,
https://doi.org/10.2298/JSC0811083P . .