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

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dc.contributor.author Raman, R.K.
dc.contributor.author Shukla, A.K.
dc.contributor.author Gayen, A.
dc.contributor.author Hegde, M.S.
dc.contributor.author Priolkar, K.R.
dc.contributor.author Sarode, P.R.
dc.contributor.author Emura, S.
dc.date.accessioned 2015-06-03T09:06:11Z
dc.date.available 2015-06-03T09:06:11Z
dc.date.issued 2006
dc.identifier.citation Journal of Power Sources. 157(1); 2006; 45-55. en_US
dc.identifier.uri http://dx.doi.org/10.1016/j.jpowsour.2005.06.031
dc.identifier.uri http://irgu.unigoa.ac.in/drs/handle/unigoa/1933
dc.description.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. en_US
dc.publisher Elsevier en_US
dc.subject Physics en_US
dc.title Tailoring a Pt-Ru catalyst for enhanced methanol electro-oxidation en_US
dc.type Journal article
dc.identifier.impf y


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