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 |
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Publication: | Journal Of Power Sources |
Publisher: | Elsavier |
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.ac.in/id/eprint/17909 |
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