Selvarani, G. and Vinod Selvaganesh, S. and Krishnamurthy, S. and Krruthika, G.V.M. and Sridhar, P. and Pitchumani, S. and Shukla, A.K. (2009) A Methanol-Tolerant Carbon-Supported Pt-Au Alloy Cathode Catalyst for Direct Methanol Fuel Cells and Its Evaluation by DFT. Journal of Physical Chemistry C, 113 (17). pp. 7461-7468. ISSN 1932-7447

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A Pt-Au alloy catalyst of varying compositions is prepared by codeposition of Pt and Au nanoparticles onto a carbon support to evaluate its electrocatalytic activity toward an oxygen reduction reaction (ORR) with methanol tolerance in direct methanol fuel cells. The optimum atomic weight ratio of Pt to Au in the carbonsupported Pt-Au alloy (Pt-Au/C) as established by cell polarization, linear-sweep voltammetry (LSV), and cyclic voltammetry (CV) studies is determined to be 2:1. A direct methanol fuel cell (DMFC) comprising a carbon-supported Pt-Au (2:1) alloy as the cathode catalyst delivers a peak power density of 120 mW/cm2 at 70 °C in contrast to the peak power density value of 80 mW/cm2 delivered by the DMFC with carbonsupported Pt catalyst operating under identical conditions. Density functional theory (DFT) calculations on a small model cluster reflect electron transfer from Pt to Au within the alloy to be responsible for the synergistic promotion of the oxygen-reduction reaction on a Pt-Au electrode.

Item Type: Article
Subjects: Electrochemical Materials Science
Depositing User: TTBD CECRI
Date Deposited: 23 Jan 2012 12:40
Last Modified: 23 Jan 2012 12:40

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