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Tailoring a Pt-Ru catalyst for enhanced methanol electro-oxidation

Ramana, RK and Shukla, AK and Gayen, A and Hegde, MS and Priolkar, KR and Sarode, PR and Emura, S (2006) Tailoring a Pt-Ru catalyst for enhanced methanol electro-oxidation. In: Journal Of Power Sources, 157 (1). pp. 45-55.

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Abstract

A carbon-supported (1:1) Pt-Ru (Pt-Ru/C) alloy catalyst has been prepared in-house by the sulfito-complex route, and has been tailored to achieve enhanced activity towards methanol electro-oxidation by annealing it at varying temperatures in air. The catalyst samples annealed between 250 and 300 degrees C in air for 30 min exhibit superior catalytic activity towards methanol electro-oxidation in a solid-polymer-electrolyte direct methanol fuel cell (SPE-DMFCs) operating at 90 degrees C. Both the as-prepared and annealed Pt-Ru/C catalysts have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and cyclic voltammetry. It is conjectured that while annealing the Pt-Ru/C catalysts, both Pt-Pt and Pt-Ru bonds increase whereas the Pt-O bond shrinks. This is accompanied with a positive variation in Ru/Pt metal ratio suggesting the diffusion of Ru metal from the bulk catalyst to surface with an increase in oxidic ruthenium content. Such a treatment appears seminal for enhancing the electrochemical activity of Pt-Ru catalysts towards methanol oxidation

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsavier.
Keywords: Methanol electro-oxidation; Direct methanol fuel cell; Electron microscopy;Photoelectron spectroscopy;X-ray absorption spectroscopy.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 13 Apr 2009 05:38
Last Modified: 19 Sep 2010 04:59
URI: http://eprints.iisc.ernet.in/id/eprint/17909

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