Shukla, A. K. ; Aricò, A. S. ; El-Khatib, K. M. ; Kim, H. ; Antonucci, P. L. ; Antonucci, V. (1999) An X-ray photoelectron spectroscopic study on the effect of Ru and Sn additions to platinised carbons Applied Surface Science, 137 (1-4). pp. 20-29. ISSN 0169-4332
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0169-4332(98)00483-8
Abstract
Electro-catalytic oxidation of methanol is known to be promoted on Pt-Ru and Pt-Sn surfaces. Whilst Ru addition to Pt has been unambiguously acknowledged to enhance the methanol-oxidation reaction, the effect of Sn in the Pt-Sn alloy remains shrouded with inconsistencies. In order to further elucidate this problem, an X-ray photoelectron spectroscopic study is carried out on various carbon-supported Pt-Ru and Pt-Sn catalysts. It is argued that while Sn produces a modification in electronic environment around Pt-sites through a charge transfer in the Pt-Sn alloy, Ru-sites in the Pt-Ru system promote the formation of labile-bonded oxygenated species in the vicinity of methanolic residues adsorbed on Pt-sites facilitating them to oxidise as carbon-di-oxide.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | X-ray Photoelectron Spectroscopy; Methanol Oxidation; Direct Methanol Fuel Cell; Chemisorption; Adsorption; Platinised Carbons |
| ID Code: | 83230 |
| Deposited On: | 17 Feb 2012 04:30 |
| Last Modified: | 17 Feb 2012 04:30 |
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