Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation
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2012
Authors
Obradović, MajaBabić, Biljana M.
Radmilović, Velimir R.
Krstajić, Nedeljko V.
Gojković, Snežana Lj.
Article (Published version)
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Show full item recordAbstract
Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss... observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads.
Keywords:
Methanol oxidation / CO oxidation / Platinum / Tungsten carbide / Electrocatalysis / Fuel cellSource:
International Journal of Hydrogen Energy, 2012, 37, 14, 10671-10679Publisher:
- Pergamon-Elsevier Science Ltd, Oxford
Funding / projects:
- Development, characterization and application nanostructured and composite electrocatalysts and interactive supports for fuel cells and water electrolysis (RS-172054)
- Reinforcing of Nanotechnology and Functional Materials Centre (EU-245916)
- Reinforcing of Nanotechnology and Functional Materials Centre (EU-245916)
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-AC02-05CH11231]
DOI: 10.1016/j.ijhydene.2012.04.114
ISSN: 0360-3199
WoS: 000306391100022
Scopus: 2-s2.0-84862647404
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Obradović, Maja AU - Babić, Biljana M. AU - Radmilović, Velimir R. AU - Krstajić, Nedeljko V. AU - Gojković, Snežana Lj. PY - 2012 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2142 AB - Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - International Journal of Hydrogen Energy T1 - Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation EP - 10679 IS - 14 SP - 10671 VL - 37 DO - 10.1016/j.ijhydene.2012.04.114 ER -
@article{ author = "Obradović, Maja and Babić, Biljana M. and Radmilović, Velimir R. and Krstajić, Nedeljko V. and Gojković, Snežana Lj.", year = "2012", abstract = "Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "International Journal of Hydrogen Energy", title = "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation", pages = "10679-10671", number = "14", volume = "37", doi = "10.1016/j.ijhydene.2012.04.114" }
Obradović, M., Babić, B. M., Radmilović, V. R., Krstajić, N. V.,& Gojković, S. Lj.. (2012). Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation. in International Journal of Hydrogen Energy Pergamon-Elsevier Science Ltd, Oxford., 37(14), 10671-10679. https://doi.org/10.1016/j.ijhydene.2012.04.114
Obradović M, Babić BM, Radmilović VR, Krstajić NV, Gojković SL. Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation. in International Journal of Hydrogen Energy. 2012;37(14):10671-10679. doi:10.1016/j.ijhydene.2012.04.114 .
Obradović, Maja, Babić, Biljana M., Radmilović, Velimir R., Krstajić, Nedeljko V., Gojković, Snežana Lj., "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation" in International Journal of Hydrogen Energy, 37, no. 14 (2012):10671-10679, https://doi.org/10.1016/j.ijhydene.2012.04.114 . .