Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation
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Аутори
Obradović, Maja D.Babić, Biljana M.
Radmilovíć, Velimir R.
Krstajic, N. V.
Gojković, Snežana Lj.
Чланак у часопису
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Приказ свих података о документуАпстракт
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. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Кључне речи:
Methanol oxidation / CO oxidation / Platinum / Tungsten carbide / Electrocatalysis / Fuel cellИзвор:
International Journal of Hydrogen Energy, 2012, 37, 14, 10671-10679Финансирање / пројекти:
- Reinforcing of Nanotechnology and Functional Materials Centre (EU-FP7-245916)
- Развој, карактеризација и примена наноструктуираних композитних катализатора и интерактивних носача у горивним спреговима и електролизи воде (RS-MESTD-Basic Research (BR or ON)-172054)
- Nanotechnology and Functional Materials Center, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
DOI: 10.1016/j.ijhydene.2012.04.114
ISSN: 0360-3199
WoS: 000306391100022
Scopus: 2-s2.0-84862647404
Колекције
Институција/група
VinčaTY - JOUR AU - Obradović, Maja D. AU - Babić, Biljana M. AU - Radmilovíć, Velimir R. AU - Krstajic, N. V. AU - Gojković, Snežana Lj. PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4946 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. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. T2 - International Journal of Hydrogen Energy T1 - Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation VL - 37 IS - 14 SP - 10671 EP - 10679 DO - 10.1016/j.ijhydene.2012.04.114 ER -
@article{ author = "Obradović, Maja D. and Babić, Biljana M. and Radmilovíć, Velimir R. and Krstajic, N. 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. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.", journal = "International Journal of Hydrogen Energy", title = "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation", volume = "37", number = "14", pages = "10671-10679", doi = "10.1016/j.ijhydene.2012.04.114" }
Obradović, M. D., Babić, B. M., Radmilovíć, V. R., Krstajic, 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, 37(14), 10671-10679. https://doi.org/10.1016/j.ijhydene.2012.04.114
Obradović MD, Babić BM, Radmilovíć VR, Krstajic 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 D., Babić, Biljana M., Radmilovíć, Velimir R., Krstajic, N. 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 . .