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Methanol oxidation on carbon-supported platinum-tin electrodes in sulfuric acid

Aricò, AS and Antonucci, V and Giordano, N and Shukla, AK and Ravikumar, MK and Roy, A and Barman, SR and Sarma, DD (1994) Methanol oxidation on carbon-supported platinum-tin electrodes in sulfuric acid. In: Journal of Power Sources, 50 (3). 295 -309 .

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Official URL: http://dx.doi.org/10.1016/0378-7753(94)01908-8

Abstract

A study is made of the electrooxidation of methanol in sulfuric acid on carbon-supported electrodes containing platinum-tin bimetal catalysts that are prepared by an in situ potentiometric-characterization route. The catalysts are investigated by employing chemical analyses, X-ray diffraction (XRD), X-ray absorption-near-edge spectroscopy (XANES) and X-ray photoelectron spectroscopy (XPS) data in conjunction with electrochemical measurements. From the electrochemical data, it is inferred that while an electrode with (3:1) Pt-Sn/C catalyst involves a two-electron rate-limiting step akin to platinum-on-carbon electrodes, it is shifted to a one-electron mechanism on electrodes with (3:2)Pt-Sn/C, (3:3)Pt-Sn/C, and (3:4)Pt-Sn/C catalysts. The study suggests that the tin content in the platinum-tin bimetal catalyst produces: (i) a charge transfer from tin to platinum; (ii) an increase in the coverage of adsorbed methanolic residues with increase in the tin content, as indicated by the shift in rest potential of the electrodes towards the reversible value for oxidation of methanol (0.043 V versus SHE), and (iii) a decrease in the overall content of higher valent platinum sites in the catalyst.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 18 Apr 2011 06:25
Last Modified: 18 Apr 2011 06:25
URI: http://eprints.iisc.ernet.in/id/eprint/36638

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