Electrochemical properties of mixed WC and Pt-black powders
Апстракт
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 unde...rpotential 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.
Кључне речи:
tungsten carbide / platinum / hydrogen intercalation / methanol oxidation / formic acid oxidationИзвор:
Journal of the Serbian Chemical Society, 2008, 73, 12, 1197-1209Финансирање / пројекти:
- Ministry of Science of the Republic of Serbia [142048, 142056]
DOI: 10.2298/JSC0812197O
ISSN: 0352-5139
WoS: 000262014900007
Scopus: 2-s2.0-57349155632
Колекције
Институција/група
VinčaTY - JOUR AU - Obradović, Maja D. AU - Babić, Biljana M. AU - Kowal, Andrzej AU - Panić, Vladimir V. AU - Gojković, Snežana Lj. PY - 2008 UR - https://vinar.vin.bg.ac.rs/handle/123456789/3601 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. T2 - Journal of the Serbian Chemical Society T1 - Electrochemical properties of mixed WC and Pt-black powders VL - 73 IS - 12 SP - 1197 EP - 1209 DO - 10.2298/JSC0812197O ER -
@article{ author = "Obradović, Maja D. and Babić, Biljana M. and Kowal, Andrzej and Panić, Vladimir V. 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.", journal = "Journal of the Serbian Chemical Society", title = "Electrochemical properties of mixed WC and Pt-black powders", volume = "73", number = "12", pages = "1197-1209", doi = "10.2298/JSC0812197O" }
Obradović, M. D., Babić, B. M., Kowal, A., Panić, V. V.,& Gojković, S. Lj.. (2008). Electrochemical properties of mixed WC and Pt-black powders. in Journal of the Serbian Chemical Society, 73(12), 1197-1209. https://doi.org/10.2298/JSC0812197O
Obradović MD, Babić BM, Kowal A, Panić VV, Gojković SL. Electrochemical properties of mixed WC and Pt-black powders. in Journal of the Serbian Chemical Society. 2008;73(12):1197-1209. doi:10.2298/JSC0812197O .
Obradović, Maja D., Babić, Biljana M., Kowal, Andrzej, Panić, Vladimir V., 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://doi.org/10.2298/JSC0812197O . .