Nishanth, K.G. and Sridhar, P. and Pitchumani, S. (2011) Enhanced oxygen reduction reaction activity through spillover effect by Pt–Y(OH)3/C catalyst in direct methanol fuel cells. Electrochemistry Communications, 13. pp. 1465-1468. ISSN 1388-2481

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Abstract

Dynamic spillover of metal oxide aided by yttrium hydroxide through its altervalent nature is utilized to develop a new carbon supported Pt–Y(OH)3 hybrid catalyst with varying Pt:Y atomic ratio of 1:1, 2:1 and 3:1 and characterized by X-Ray diffraction and Transmission electron microscopy techniques. Pt–Y/C catalysts exhibit significant improvement in oxygen reduction reaction (ORR) over commercial Pt/C. The effects of composition toward ORR with and without methanol have been studied. Among the various Pt–Y(OH)3/C catalysts, the one with Pt to Y in 3:1 atomic ratio shows the highest activity for ORR in aqueous HClO4 solution without methanol while the one with Pt to Y in 2:1 atomic ratio shows the maximum activity for ORR in presence of methanol. A direct methanol fuel cell (DMFC) employing carbon-supported Pt–Y(OH)3 as the cathode catalyst delivers a peak-power density of 105 mW/cm2 at 70 °C as compared to a peak-power density of 64 mW/cm2 obtained with the DMFC employing carbon-supported Pt catalyst operating under similar conditions

Item Type:	Article
Uncontrolled Keywords:	DMFCs; Electro-catalysis; ORR catalyst; Methanol-tolerant catalyst; Pt–Y(OH)3
Subjects:	Fuel Cells Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	19 Nov 2012 10:34
Last Modified:	19 Nov 2012 10:34
URI:	http://cecri.csircentral.net/id/eprint/2928

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