Kowal, Andrzej

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orcid::0000-0002-7312-0092
  • Kowal, Andrzej (6)
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Author's Bibliography

Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction

Stevanović, Sanja; Jovanović, Vladislava M.; Rogan, Jelena; Kowal, Andrzej

(Engineering Society for Corrosion, Belgrade, Serbia, 2016)

TY  - JOUR
AU  - Stevanović, Sanja
AU  - Jovanović, Vladislava M.
AU  - Rogan, Jelena
AU  - Kowal, Andrzej
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3220
AB  - Carbon supported platinum catalysts for ethanol electrooxidation were synthesized by modified polyol synthesis method, assisted by microwave or reflux heating. Synthesized catalysts were characterized by XRD, STM and TGA techniques to determine their structural and morphological properties. STM and XRD investigations revealed small particle size (~3nm), while TGA showed Pt loading of 20% in both samples. Electrocatalytic activity of prepared catalysts was examined by potentiodynamic measurements and compared to commercial Pt catalyst (Pt/C-Tanaka). The highest activity for ethanol electrooxidation was observed with Pt catalyst prepared by microwave irradiation. The increase in activity can be assigned to the benefits of microwave assisted synthesis, such as small particle size and homogeneous particle distribution on the support.
AB  - Platinski katalizatori na ugljeničnoj podlozi su sintetizovani korišćenjem modifikovanog poliol postupka uz primenu mikrotalasnog ili refluks zagrevanja za reakciju elektrooksidacije etanola. Dobijeni katalizatori su karakterisani strukturno i morfološki korišćenjem XRD, STM i TGA tehnika. STM i XRD ispitivanja su pokazala malu veličinu čestica (~3nm), dok je TGA pokazala da je sadržaj metala u katalizatoru 20%. Elektrokatalitička aktivnost sintetizovanih katalizatora je ispitivana potenciodinamičkim merenjima i upoređena sa komercijalnim platinskim katalizatorom (Pt/C-Tanaka). Najbolju aktivnost za elektrooksidaciju etanola pokazao je platinski katalizator sintetizovan uz korišćenje mikrotalasnog zagrevanja. Veća aktivnost se može pripisati prednostima mikrotalasnog zagrevanja u toku sinteze jer je dobijen katalizator sa malom veličinom i homogenom di stribucijom čestica.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction
T1  - Uticaj postupka sinteze na aktivnost platinskih katalizatora za reakciju elektrooksidacije etanola
EP  - 345
IS  - 2
SP  - 339
VL  - 57
DO  - 10.5937/ZasMat1602339S
ER  - 
@article{
author = "Stevanović, Sanja and Jovanović, Vladislava M. and Rogan, Jelena and Kowal, Andrzej",
year = "2016",
abstract = "Carbon supported platinum catalysts for ethanol electrooxidation were synthesized by modified polyol synthesis method, assisted by microwave or reflux heating. Synthesized catalysts were characterized by XRD, STM and TGA techniques to determine their structural and morphological properties. STM and XRD investigations revealed small particle size (~3nm), while TGA showed Pt loading of 20% in both samples. Electrocatalytic activity of prepared catalysts was examined by potentiodynamic measurements and compared to commercial Pt catalyst (Pt/C-Tanaka). The highest activity for ethanol electrooxidation was observed with Pt catalyst prepared by microwave irradiation. The increase in activity can be assigned to the benefits of microwave assisted synthesis, such as small particle size and homogeneous particle distribution on the support., Platinski katalizatori na ugljeničnoj podlozi su sintetizovani korišćenjem modifikovanog poliol postupka uz primenu mikrotalasnog ili refluks zagrevanja za reakciju elektrooksidacije etanola. Dobijeni katalizatori su karakterisani strukturno i morfološki korišćenjem XRD, STM i TGA tehnika. STM i XRD ispitivanja su pokazala malu veličinu čestica (~3nm), dok je TGA pokazala da je sadržaj metala u katalizatoru 20%. Elektrokatalitička aktivnost sintetizovanih katalizatora je ispitivana potenciodinamičkim merenjima i upoređena sa komercijalnim platinskim katalizatorom (Pt/C-Tanaka). Najbolju aktivnost za elektrooksidaciju etanola pokazao je platinski katalizator sintetizovan uz korišćenje mikrotalasnog zagrevanja. Veća aktivnost se može pripisati prednostima mikrotalasnog zagrevanja u toku sinteze jer je dobijen katalizator sa malom veličinom i homogenom di stribucijom čestica.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction, Uticaj postupka sinteze na aktivnost platinskih katalizatora za reakciju elektrooksidacije etanola",
pages = "345-339",
number = "2",
volume = "57",
doi = "10.5937/ZasMat1602339S"
}
Stevanović, S., Jovanović, V. M., Rogan, J.,& Kowal, A.. (2016). Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 57(2), 339-345.
https://doi.org/10.5937/ZasMat1602339S
Stevanović S, Jovanović VM, Rogan J, Kowal A. Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction. in Zaštita materijala. 2016;57(2):339-345.
doi:10.5937/ZasMat1602339S .
Stevanović, Sanja, Jovanović, Vladislava M., Rogan, Jelena, Kowal, Andrzej, "Influence of the synthesis procedures on pt catalyst activity for ethanol electrooxidation reaction" in Zaštita materijala, 57, no. 2 (2016):339-345,
https://doi.org/10.5937/ZasMat1602339S . .
1

A comparative study of the electrochemical properties of carbon nanotubes and carbon black

Obradović, Maja; Vuković, Goran D.; Stevanović, Sanja; Panić, Vladimir; Uskoković, Petar; Kowal, Andrzej; Gojković, Snežana Lj.

(Elsevier Science Sa, Lausanne, 2009)

TY  - JOUR
AU  - Obradović, Maja
AU  - Vuković, Goran D.
AU  - Stevanović, Sanja
AU  - Panić, Vladimir
AU  - Uskoković, Petar
AU  - Kowal, Andrzej
AU  - Gojković, Snežana Lj.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1420
AB  - Two samples of commercial multi-walled carbon nanotubes (Sigma-Aldrich and Sun Nanotech) and a sample of carbon black (Vulcan XC-72R) were investigated in raw state and after the activation in nitric and sulfuric acid by ultrasound agitation. Atomic force microscopy revealed that activated Sigma-Aldrich nanotubes are straight with corrugated walls (bamboo-like structure), while Sun Nanotech nanotubes are tortuous with smooth walls. Fourier transform infrared spectroscopy showed that abundance of oxygen-containing functional groups was formed on both Sigma-Aldrich and Sun Nanotech carbon nanotubes, as well as on carbon black surfaces. Electrochemical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the electrochemically active surface area of all carbon samples is expanded, charge storage ability is enhanced and the electron-transfer kinetics, probed by Fe(CN)(6)(3-)/Fe(CN)(6)(4-) redox couple, is promoted upon activation. The characteristics of carbon nanotubes were superior to Carbon black. Morphology of the carbon nanotubes was found to be important; nanotubes with corrugated walls showed faster electron-transfer and pseudocapacitive redox kinetics than nanotubes with smooth walls. This was explained by the higher proportion of edge and defect sites, which are known as more electrochemically active than the walls of uniform graphene structure.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - A comparative study of the electrochemical properties of carbon nanotubes and carbon black
EP  - 30
IS  - 1
SP  - 22
VL  - 634
DO  - 10.1016/j.jelechem.2009.07.001
ER  - 
@article{
author = "Obradović, Maja and Vuković, Goran D. and Stevanović, Sanja and Panić, Vladimir and Uskoković, Petar and Kowal, Andrzej and Gojković, Snežana Lj.",
year = "2009",
abstract = "Two samples of commercial multi-walled carbon nanotubes (Sigma-Aldrich and Sun Nanotech) and a sample of carbon black (Vulcan XC-72R) were investigated in raw state and after the activation in nitric and sulfuric acid by ultrasound agitation. Atomic force microscopy revealed that activated Sigma-Aldrich nanotubes are straight with corrugated walls (bamboo-like structure), while Sun Nanotech nanotubes are tortuous with smooth walls. Fourier transform infrared spectroscopy showed that abundance of oxygen-containing functional groups was formed on both Sigma-Aldrich and Sun Nanotech carbon nanotubes, as well as on carbon black surfaces. Electrochemical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the electrochemically active surface area of all carbon samples is expanded, charge storage ability is enhanced and the electron-transfer kinetics, probed by Fe(CN)(6)(3-)/Fe(CN)(6)(4-) redox couple, is promoted upon activation. The characteristics of carbon nanotubes were superior to Carbon black. Morphology of the carbon nanotubes was found to be important; nanotubes with corrugated walls showed faster electron-transfer and pseudocapacitive redox kinetics than nanotubes with smooth walls. This was explained by the higher proportion of edge and defect sites, which are known as more electrochemically active than the walls of uniform graphene structure.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "A comparative study of the electrochemical properties of carbon nanotubes and carbon black",
pages = "30-22",
number = "1",
volume = "634",
doi = "10.1016/j.jelechem.2009.07.001"
}
Obradović, M., Vuković, G. D., Stevanović, S., Panić, V., Uskoković, P., Kowal, A.,& Gojković, S. Lj.. (2009). A comparative study of the electrochemical properties of carbon nanotubes and carbon black. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 634(1), 22-30.
https://doi.org/10.1016/j.jelechem.2009.07.001
Obradović M, Vuković GD, Stevanović S, Panić V, Uskoković P, Kowal A, Gojković SL. A comparative study of the electrochemical properties of carbon nanotubes and carbon black. in Journal of Electroanalytical Chemistry. 2009;634(1):22-30.
doi:10.1016/j.jelechem.2009.07.001 .
Obradović, Maja, Vuković, Goran D., Stevanović, Sanja, Panić, Vladimir, Uskoković, Petar, Kowal, Andrzej, Gojković, Snežana Lj., "A comparative study of the electrochemical properties of carbon nanotubes and carbon black" in Journal of Electroanalytical Chemistry, 634, no. 1 (2009):22-30,
https://doi.org/10.1016/j.jelechem.2009.07.001 . .
46
41
48

Synthesis, characterization and electrocatalytic activity for ethanol oxidation of carbon supported Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 nanoclusters

Kowal, Andrzej; Gojković, Snežana Lj.; Lee, K-S.; Olszewski, Piotr K.; Sung, Y-E.

(Elsevier Science Inc, New York, 2009)

TY  - JOUR
AU  - Kowal, Andrzej
AU  - Gojković, Snežana Lj.
AU  - Lee, K-S.
AU  - Olszewski, Piotr K.
AU  - Sung, Y-E.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1518
AB  - Nanoclusters of Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 were successfully synthesized by polyol method and deposited on high-area carbon. HIRTEM and XRD analysis revealed two phases in the ternary Pt-Rh-SnO2/C catalyst: solid solution of Rh in Pt and SnO2. The activity of Pt-Rh-SnO2/C for ethanol oxidation was found to be much higher than Pt/C and Pt-Rh/C and also superior to Pt-SnO2/C. Quasi steady-state measurements at various temperatures (30-60 degrees C), ethanol concentrations (0.01-1 M) and H2SO4 concentrations (0.02-0.5 M) showed that Pt-Rh-SnO2/C is about 20 times more active than Pt/C in the potential range of interest for the fuel cell application.
PB  - Elsevier Science Inc, New York
T2  - Electrochemistry Communications
T1  - Synthesis, characterization and electrocatalytic activity for ethanol oxidation of carbon supported Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 nanoclusters
EP  - 727
IS  - 4
SP  - 724
VL  - 11
DO  - 10.1016/j.elecom.2009.01.022
ER  - 
@article{
author = "Kowal, Andrzej and Gojković, Snežana Lj. and Lee, K-S. and Olszewski, Piotr K. and Sung, Y-E.",
year = "2009",
abstract = "Nanoclusters of Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 were successfully synthesized by polyol method and deposited on high-area carbon. HIRTEM and XRD analysis revealed two phases in the ternary Pt-Rh-SnO2/C catalyst: solid solution of Rh in Pt and SnO2. The activity of Pt-Rh-SnO2/C for ethanol oxidation was found to be much higher than Pt/C and Pt-Rh/C and also superior to Pt-SnO2/C. Quasi steady-state measurements at various temperatures (30-60 degrees C), ethanol concentrations (0.01-1 M) and H2SO4 concentrations (0.02-0.5 M) showed that Pt-Rh-SnO2/C is about 20 times more active than Pt/C in the potential range of interest for the fuel cell application.",
publisher = "Elsevier Science Inc, New York",
journal = "Electrochemistry Communications",
title = "Synthesis, characterization and electrocatalytic activity for ethanol oxidation of carbon supported Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 nanoclusters",
pages = "727-724",
number = "4",
volume = "11",
doi = "10.1016/j.elecom.2009.01.022"
}
Kowal, A., Gojković, S. Lj., Lee, K-S., Olszewski, P. K.,& Sung, Y-E.. (2009). Synthesis, characterization and electrocatalytic activity for ethanol oxidation of carbon supported Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 nanoclusters. in Electrochemistry Communications
Elsevier Science Inc, New York., 11(4), 724-727.
https://doi.org/10.1016/j.elecom.2009.01.022
Kowal A, Gojković SL, Lee K, Olszewski PK, Sung Y. Synthesis, characterization and electrocatalytic activity for ethanol oxidation of carbon supported Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 nanoclusters. in Electrochemistry Communications. 2009;11(4):724-727.
doi:10.1016/j.elecom.2009.01.022 .
Kowal, Andrzej, Gojković, Snežana Lj., Lee, K-S., Olszewski, Piotr K., Sung, Y-E., "Synthesis, characterization and electrocatalytic activity for ethanol oxidation of carbon supported Pt, Pt-Rh, Pt-SnO2 and Pt-Rh-SnO2 nanoclusters" in Electrochemistry Communications, 11, no. 4 (2009):724-727,
https://doi.org/10.1016/j.elecom.2009.01.022 . .
121
111
127

Electrochemical properties of mixed WC and Pt-black powders

Obradović, Maja; Babić, Biljana M.; Kowal, Andrzej; Panić, Vladimir; Gojković, Snežana Lj.

(Serbian Chemical Society, Belgrade, 2008)

TY  - JOUR
AU  - Obradović, Maja
AU  - Babić, Biljana M.
AU  - Kowal, Andrzej
AU  - Panić, Vladimir
AU  - Gojković, Snežana Lj.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1305
AB  - The electrochemical characteristics of a mixture of Pt-black and WC powders and its catalytic activity for methanol and formic acid oxidation were investigated in acid solution. XRD and AFM measurements revealed that the WC powder employed for the investigation was a single-phase material consisting of crystallites/spherical particles of average size of about 50 nm, which were agglomerated into much larger particles. Cyclic voltammetry showed that the WC underwent electrochemical oxidation, producing tungstate species. In the case of the mixed Pt + WC powders, the tungstate species were deposited on the Pt as a thin film of hydrous tungsten oxide. Enhanced hydrogen intercalation in the hydrous tungsten oxide was observed and it was proposed to be promoted in mixed powders by the presence of hydrogen adatoms on bare Pt sites. The determination of Pt surface area in the Pt + WC layer by stripping of underpotentially deposited Cu revealed that the entire Pt surface was accessible for underpotential deposition of Cu. Investigation of the electrochemical oxidation of methanol and formic acid on Pt + WC and pure Pt layers did not indicate electrocatalytic promotion due to the presence of WC.
AB  - U radu su ispitivane elektrohemijske karakteristike smeše prahova Pt i WC i njena katalitička aktivnost za reakcije oksidacije metanola i mravlje kiseline u kiselom rastvoru. Analiza rezultata difrakcije X-zraka (XRD) i mikroskopije atomskih sila (AFM) pokazuju da je prah WC jednofazni materijal sa prosečnom veličinom kristalita od oko 50 nm, koji su aglomerisani u mnogo veće čestice. Ciklična voltametrija ukazuje na to da WC podleže oksidaciji kojom nastaju volframatne vrste. U slučaju smeše prahova Pt i WC, volframatne vrste najverovatnije se talože na Pt u obliku tankog sloja hidratisanih oksida volframa. Primećeno je povećanje interkalacije vodonika u sloju hidratisanih volframata i pretpostavlja se da prisustvo adatoma vodonika na površini Pt potpomaže proces vodonične interkalacije. Određivanje površine Pt u sloju Pt + WC desorpcijom monosloja Cu taloženog na potpotencijalima ukazuje da je čitava površina Pt dostupna za taloženje atoma Cu. Ispitivanje elektrohemijskih reakcija oksidacije metanola i mravlje kiseline na sloju smeše Pt + WC i sloju čiste Pt ukazuje da prisustvo praha WC ne utiče na elektrokatalitička svojstva Pt.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical properties of mixed WC and Pt-black powders
T1  - Elektrohemijska svojstva smeše prahova WC i Pt
EP  - 1209
IS  - 12
SP  - 1197
VL  - 73
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1305
ER  - 
@article{
author = "Obradović, Maja and Babić, Biljana M. and Kowal, Andrzej and Panić, Vladimir and Gojković, Snežana Lj.",
year = "2008",
abstract = "The electrochemical characteristics of a mixture of Pt-black and WC powders and its catalytic activity for methanol and formic acid oxidation were investigated in acid solution. XRD and AFM measurements revealed that the WC powder employed for the investigation was a single-phase material consisting of crystallites/spherical particles of average size of about 50 nm, which were agglomerated into much larger particles. Cyclic voltammetry showed that the WC underwent electrochemical oxidation, producing tungstate species. In the case of the mixed Pt + WC powders, the tungstate species were deposited on the Pt as a thin film of hydrous tungsten oxide. Enhanced hydrogen intercalation in the hydrous tungsten oxide was observed and it was proposed to be promoted in mixed powders by the presence of hydrogen adatoms on bare Pt sites. The determination of Pt surface area in the Pt + WC layer by stripping of underpotentially deposited Cu revealed that the entire Pt surface was accessible for underpotential deposition of Cu. Investigation of the electrochemical oxidation of methanol and formic acid on Pt + WC and pure Pt layers did not indicate electrocatalytic promotion due to the presence of WC., U radu su ispitivane elektrohemijske karakteristike smeše prahova Pt i WC i njena katalitička aktivnost za reakcije oksidacije metanola i mravlje kiseline u kiselom rastvoru. Analiza rezultata difrakcije X-zraka (XRD) i mikroskopije atomskih sila (AFM) pokazuju da je prah WC jednofazni materijal sa prosečnom veličinom kristalita od oko 50 nm, koji su aglomerisani u mnogo veće čestice. Ciklična voltametrija ukazuje na to da WC podleže oksidaciji kojom nastaju volframatne vrste. U slučaju smeše prahova Pt i WC, volframatne vrste najverovatnije se talože na Pt u obliku tankog sloja hidratisanih oksida volframa. Primećeno je povećanje interkalacije vodonika u sloju hidratisanih volframata i pretpostavlja se da prisustvo adatoma vodonika na površini Pt potpomaže proces vodonične interkalacije. Određivanje površine Pt u sloju Pt + WC desorpcijom monosloja Cu taloženog na potpotencijalima ukazuje da je čitava površina Pt dostupna za taloženje atoma Cu. Ispitivanje elektrohemijskih reakcija oksidacije metanola i mravlje kiseline na sloju smeše Pt + WC i sloju čiste Pt ukazuje da prisustvo praha WC ne utiče na elektrokatalitička svojstva Pt.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical properties of mixed WC and Pt-black powders, Elektrohemijska svojstva smeše prahova WC i Pt",
pages = "1209-1197",
number = "12",
volume = "73",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1305"
}
Obradović, M., Babić, B. M., Kowal, A., Panić, V.,& Gojković, S. Lj.. (2008). Electrochemical properties of mixed WC and Pt-black powders. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 73(12), 1197-1209.
https://hdl.handle.net/21.15107/rcub_technorep_1305
Obradović M, Babić BM, Kowal A, Panić V, Gojković SL. Electrochemical properties of mixed WC and Pt-black powders. in Journal of the Serbian Chemical Society. 2008;73(12):1197-1209.
https://hdl.handle.net/21.15107/rcub_technorep_1305 .
Obradović, Maja, Babić, Biljana M., Kowal, Andrzej, Panić, Vladimir, Gojković, Snežana Lj., "Electrochemical properties of mixed WC and Pt-black powders" in Journal of the Serbian Chemical Society, 73, no. 12 (2008):1197-1209,
https://hdl.handle.net/21.15107/rcub_technorep_1305 .
10
12

Study of the kinetics and the influence of Bi-irr, on formic acid oxidation at Pt2RU3/C

Tripković, Amalija; Gojković, Snežana Lj.; Popović, Ksenija; Lović, Jelena; Kowal, Andrzej

(Pergamon-Elsevier Science Ltd, Oxford, 2007)

TY  - JOUR
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
AU  - Popović, Ksenija
AU  - Lović, Jelena
AU  - Kowal, Andrzej
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1147
AB  - Electrochemical oxidation of HCOOH in H2SO4 and HCIO4 solutions was examined on thin film Pt2RU3/C electrode. XRD pattern revealed that Pt2RU3 alloy consisted of the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru. According to STM images, Pt2RU3 particles size was between 2 and 6 nm. It was established that electrochemical oxidation of HCOOH commenced at -0.1 V versus SCE at Pt sites in the catalyst. Kinetic parameters indicated that dehydrogenation path was predominant. Dehydration occurs in parallel, but without significant poisoning by COad dowing to oxidative removal by OH species on Ru atoms. The coverage Of Pt2RU3 surface by CO preadsorbed from the solution was found to be 24% lower when the surface was modified by irreversibly adsorbed Bi. Modification by Bi also shifted the onset potential for HCOOH oxidation for about 50 m V towards more negative values and consequently, increased the reaction rate for a factor of two. It was proposed that Ru acts through bifunctional mechanism, i.e. OH species adsorbed on Ru oxidizes COad from Pt sites, while Bi hinders the adsorption of CO on Pt sites via electronic and/or ensemble effects.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Electrochimica Acta
T1  - Study of the kinetics and the influence of Bi-irr, on formic acid oxidation at Pt2RU3/C
EP  - 893
IS  - 2
SP  - 887
VL  - 53
DO  - 10.1016/j.electacta.2007.07.073
ER  - 
@article{
author = "Tripković, Amalija and Gojković, Snežana Lj. and Popović, Ksenija and Lović, Jelena and Kowal, Andrzej",
year = "2007",
abstract = "Electrochemical oxidation of HCOOH in H2SO4 and HCIO4 solutions was examined on thin film Pt2RU3/C electrode. XRD pattern revealed that Pt2RU3 alloy consisted of the solid solution of Ru in Pt and the small amount of Ru or solid solution of Pt in Ru. According to STM images, Pt2RU3 particles size was between 2 and 6 nm. It was established that electrochemical oxidation of HCOOH commenced at -0.1 V versus SCE at Pt sites in the catalyst. Kinetic parameters indicated that dehydrogenation path was predominant. Dehydration occurs in parallel, but without significant poisoning by COad dowing to oxidative removal by OH species on Ru atoms. The coverage Of Pt2RU3 surface by CO preadsorbed from the solution was found to be 24% lower when the surface was modified by irreversibly adsorbed Bi. Modification by Bi also shifted the onset potential for HCOOH oxidation for about 50 m V towards more negative values and consequently, increased the reaction rate for a factor of two. It was proposed that Ru acts through bifunctional mechanism, i.e. OH species adsorbed on Ru oxidizes COad from Pt sites, while Bi hinders the adsorption of CO on Pt sites via electronic and/or ensemble effects.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Study of the kinetics and the influence of Bi-irr, on formic acid oxidation at Pt2RU3/C",
pages = "893-887",
number = "2",
volume = "53",
doi = "10.1016/j.electacta.2007.07.073"
}
Tripković, A., Gojković, S. Lj., Popović, K., Lović, J.,& Kowal, A.. (2007). Study of the kinetics and the influence of Bi-irr, on formic acid oxidation at Pt2RU3/C. in Electrochimica Acta
Pergamon-Elsevier Science Ltd, Oxford., 53(2), 887-893.
https://doi.org/10.1016/j.electacta.2007.07.073
Tripković A, Gojković SL, Popović K, Lović J, Kowal A. Study of the kinetics and the influence of Bi-irr, on formic acid oxidation at Pt2RU3/C. in Electrochimica Acta. 2007;53(2):887-893.
doi:10.1016/j.electacta.2007.07.073 .
Tripković, Amalija, Gojković, Snežana Lj., Popović, Ksenija, Lović, Jelena, Kowal, Andrzej, "Study of the kinetics and the influence of Bi-irr, on formic acid oxidation at Pt2RU3/C" in Electrochimica Acta, 53, no. 2 (2007):887-893,
https://doi.org/10.1016/j.electacta.2007.07.073 . .
25
26
27

Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst

Lović, Jelena; Tripković, Amalija; Gojković, Snežana Lj.; Popović, Ksenija; Tripković, Dušan; Olszewski, Piotr K.; Kowal, Andrzej

(Elsevier Science Sa, Lausanne, 2005)

TY  - JOUR
AU  - Lović, Jelena
AU  - Tripković, Amalija
AU  - Gojković, Snežana Lj.
AU  - Popović, Ksenija
AU  - Tripković, Dušan
AU  - Olszewski, Piotr K.
AU  - Kowal, Andrzej
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/781
AB  - Oxidation of formic acid on the platinum catalyst supported on high area carbon was investigated by potent iodynamic and quasi-steady-state polarization measurements. It was found that the poisoning of the reaction occurred both in the hydrogen region and in the double-layer region, but poisons were formed faster at lower potentials. Kinetics of the reaction was consistent with the dual path mechanism. At lower potentials HCOOH was oxidized to CO, at the Pt sites uncovered by COads. If high coverage by the poisoning species was attained, the reaction reached the limiting current plateau and further increase of the Current densities started at the potential of COads oxidation. Kinetic parameters of the HCOOH oxidation suggested that the rate determining step was the transfer of the first electron from HCOOHads, which was adsorbed under the Temkin conditions, Oxidation of formic acid became pH-dependent reaction in the electrolytes of pH  lt  1 with the reaction order with respect to H+ ions of about - 0.8.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst
EP  - 302
IS  - 2
SP  - 294
VL  - 581
DO  - 10.1016/j.jelechem.2005.05.002
ER  - 
@article{
author = "Lović, Jelena and Tripković, Amalija and Gojković, Snežana Lj. and Popović, Ksenija and Tripković, Dušan and Olszewski, Piotr K. and Kowal, Andrzej",
year = "2005",
abstract = "Oxidation of formic acid on the platinum catalyst supported on high area carbon was investigated by potent iodynamic and quasi-steady-state polarization measurements. It was found that the poisoning of the reaction occurred both in the hydrogen region and in the double-layer region, but poisons were formed faster at lower potentials. Kinetics of the reaction was consistent with the dual path mechanism. At lower potentials HCOOH was oxidized to CO, at the Pt sites uncovered by COads. If high coverage by the poisoning species was attained, the reaction reached the limiting current plateau and further increase of the Current densities started at the potential of COads oxidation. Kinetic parameters of the HCOOH oxidation suggested that the rate determining step was the transfer of the first electron from HCOOHads, which was adsorbed under the Temkin conditions, Oxidation of formic acid became pH-dependent reaction in the electrolytes of pH  lt  1 with the reaction order with respect to H+ ions of about - 0.8.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst",
pages = "302-294",
number = "2",
volume = "581",
doi = "10.1016/j.jelechem.2005.05.002"
}
Lović, J., Tripković, A., Gojković, S. Lj., Popović, K., Tripković, D., Olszewski, P. K.,& Kowal, A.. (2005). Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst. in Journal of Electroanalytical Chemistry
Elsevier Science Sa, Lausanne., 581(2), 294-302.
https://doi.org/10.1016/j.jelechem.2005.05.002
Lović J, Tripković A, Gojković SL, Popović K, Tripković D, Olszewski PK, Kowal A. Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst. in Journal of Electroanalytical Chemistry. 2005;581(2):294-302.
doi:10.1016/j.jelechem.2005.05.002 .
Lović, Jelena, Tripković, Amalija, Gojković, Snežana Lj., Popović, Ksenija, Tripković, Dušan, Olszewski, Piotr K., Kowal, Andrzej, "Kinetic study of formic acid oxidation on carbon-supported platinum electrocatalyst" in Journal of Electroanalytical Chemistry, 581, no. 2 (2005):294-302,
https://doi.org/10.1016/j.jelechem.2005.05.002 . .
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