Kiran, V. and Ravikumar, T. and Kalyanasundaram, N.T. and Krishnamurty, S. and Shukla, A.K. and Sampath, S. (2010) Electro-Oxidation of Borohydride on Rhodium, Iridium, and Rhodium–Iridium Bimetallic Nanoparticles with Implications to Direct Borohydride Fuel Cells. Journal of the Electrochemical Society, 157 (8). B1201-B1208. ISSN 0013-4651

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Abstract

Electrochemical oxidation of borohydride is studied on nanosized rhodium, iridium, and bimetallic rhodium–iridium catalysts supported onto Vulcan XC72R carbon. The catalysts are characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy in conjunction with cyclic voltammetry and polarization studies. The studies reveal that a 20 wt % bimetallic Rh–Ir catalyst supported onto carbon �Rh–Ir/C� is quite effective for the oxidation of borohydride. Direct borohydride fuel cell with Rh–Ir/C as the anode catalyst and Pt/C as the cathode catalyst exhibits a peak power density of 270 mW/cm2 at a load current density of 290 mA/cm2 as against 200 mW/cm2 at 225 mA/cm2 for Rh/C and 140 mW/cm2 at 165 mA/cm2 for Ir/C while operating at 80°C. The synergistic catalytic activity for the bimetallic Rh–Ir nanoparticles toward borohydride oxidation is corroborated by density-functional theory calculations using electron-localization function.

Item Type:	Article
Subjects:	Fuel Cells Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	19 Jan 2012 08:53
Last Modified:	19 Jan 2012 08:53
URI:	http://cecri.csircentral.net/id/eprint/326

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