Electro-oxidation of borohydride on rhodium, iridium, and rhodium-iridium bimetallic nanoparticles with implications to direct borohydride fuel cells

Kiran, V. ; Ravikumar, T. ; Kalyanasundaram, N. T. ; Krishnamurty, S. ; Shukla, A. K. ; 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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Related URL: http://dx.doi.org/10.1149/1.3442372

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
Source:Copyright of this article belongs to The Electrochemical Society.
Keywords:Catalysts; Current Density; Density Functional Theory; Electrochemistry; Fuel Cells; Nanoparticles; Oxidation; Transmission Electron Microscopy; Voltammetry (Chemical Analysis); X-ray Diffraction; X-ray Photoelectron Spectra
ID Code:57377
Deposited On:26 Aug 2011 08:09
Last Modified:17 Jul 2012 08:16

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