A DMFC with Methanol-Tolerant-Carbon-Supported-Pt-Pd-Alloy Cathode

Nishanth, KG and Sridhar, P and Pitchumani, S and Shukla, AK (2011) A DMFC with Methanol-Tolerant-Carbon-Supported-Pt-Pd-Alloy Cathode. In: Journal of the Electrochemical Society, 158 (8). B871-B876.

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Abstract

Methanol-tolerant Pt-Pd alloy catalysts supported on to carbon with varying Pt:Pd atomic ratios of 1:1, 2:1 and 3:1 are prepared by a novel wet-chemical method and characterized using powder XRD, XPS, FESEM, EDAX and TEM techniques. The optimum atomic weight ratio for Pt to Pd in the carbon-supported alloy catalyst as established by linear-sweep voltammetry (LSV) and cell polarization studies is found to be 2:1. A direct methanol fuel cell (DMFC) employing carbon-supported Pt-Pd (2:1) alloy (Pt-Pd/C) catalyst as the cathode catalyst delivers a peak-power density of 115 mW/cm(2) at 70 degrees C as compared to peak-power density of 60 mW/cm(2) obtained with the DMFC employing carbon-supported Pt (Pt/C) catalyst operating under similar conditions. In the literature, DMFCs operating with Pt-TiO2 (2:1)/C and Pt-Au (2:1)/C methanol-tolerant cathodes are reported to exhibit maximum ORR activity among the group of these methanol-tolerant cathodes with varying catalysts compositions. Accordingly, the present study also provides an effective route to design methanol-tolerant-oxygen-reduction catalysts for DMFCs. (C) 2011 The Electrochemical Society. DOI: 10.1149/1.3596542] All rights reserved.

Item Type:	Journal Article
Publication:	Journal of the Electrochemical Society
Publisher:	The Electrochemical Society
Additional Information:	Copyright of this article belongs to The Electrochemical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	18 Jul 2011 08:47
Last Modified:	18 Jul 2011 08:47
URI:	http://eprints.iisc.ac.in/id/eprint/39092

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