An X-ray photoelectron spectroscopic study on the effect of Ru and Sn additions to platinised carbons

Shukla, AK and Arico, AS and El-Khatib, KM and Kim, H and Antonucci, PL and Antonucci, V (1999) An X-ray photoelectron spectroscopic study on the effect of Ru and Sn additions to platinised carbons. In: Applied Surface Science, 137 (1-4). pp. 20-29.

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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:	Journal Article
Publication:	Applied Surface Science
Publisher:	Elsevier Science BV
Additional Information:	Copyright of this article belongs to Elsevier Science BV.
Keywords:	X-ray photoelectron spectroscopy;Methanol oxidation;Direct methanol fuel cell;Chemisorption;Adsorption;Platinised carbons.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	23 Mar 2009 05:19
Last Modified:	19 Sep 2010 04:59
URI:	http://eprints.iisc.ac.in/id/eprint/17997

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