Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation(Article)
- aInstitute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
- bVinča Institute of Nuclear Sciences, University of Belgrade, P. O. Box 522, 11001 Belgrade, Serbia
- cFaculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia
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 CO ads 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 CO ads 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 CO ads. © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Indexed keywords
| Engineering uncontrolled terms | Bifunctional mechanismsCo oxidationCore shell structureCore-shellCryogelsGraphitized carbonsHydrogen intercalationMeta-tungstateMethanol electrooxidationMethanol OxidationOnset potentialOxidation of COPositive potentialPotential cyclingPt catalystsPt nanoparticlesStability testsSupporting electrolyteSurface areaTungsten oxide |
|---|---|
| Engineering controlled terms: | CalcinationCarbonCatalyst poisoningCatalyst supportsCyclic voltammetryElectrocatalysisElectrolytesElectrooxidationFuel cellsHydrogenMethanolOxidationOxidesPlatinumPlatinum alloysTransmission electron microscopyTungstenX ray diffraction |
| Engineering main heading: | Tungsten carbide |
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Basic Energy Sciences | BES | |
| European Commission See opportunities by EC | EC | |
| Office of Science See opportunities by SC | SC | |
| Seventh Framework Programme | 245916 | FP7 |
| U.S. Department of Energy See opportunities by USDOE | DE-AC02-05CH11231 | USDOE |
| ON 172054 | ||
| 172054 |
-
1
This work was financially supported by the Ministry of Science, Republic of Serbia , Contract No. ON 172054 . V.R.R acknowledges support of Nanotechnology and Functional Materials Center , funded by the European FP7 project No. 245916 . Electron microscopy was performed at the National Center for Electron Microscopy, which is supported by the Office of Science, Office of Basic Energy Sciences , of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 .
- ISSN: 03603199
- CODEN: IJHED
- Source Type: Journal
- Original language: English
- DOI: 10.1016/j.ijhydene.2012.04.114
- Document Type: Article
Gojković, S.L.; Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Serbia;
© Copyright 2012 Elsevier B.V., All rights reserved.
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