Ethanol‐tolerant Pt‐alloy cathodes for direct ethanol fuel cell (DEFC) applications

Asia-Pacific Journal of Chemical Engineering - Tập 4 Số 1 - Trang 17-24 - 2009
F.J. Rodríguez‐Varela1, O. Savadogo2
1Grupo de Recursos Naturales y Energéticos, Cinvestav Unidad Saltillo, Carr. Saltillo‐Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, México
2Laboratoire d'Électrochimie et de Matériaux Énergétiques, École Polytechnique de Montréal, C.P. 6079, succ. Centre‐ville, Montréal, QC, H3C 3A7, Canada.

Tóm tắt

Abstract

The electroactivity of Pt1Co1(a/o)/C and Pt3Cr1(a/o)/C for the oxygen reduction reaction (ORR) in ethanol‐containing medium was studied. It was found that these cathodes present a high tolerance to this alcohol. The onset potential of the ORR decreased at 14 and 12 mV in the presence of 0.5 M ethanol on Pt1Co1/C and Pt3Cr1/C, respectively. The tolerance of the Pt alloys is one order of magnitude higher than that shown by Pt‐alone catalysts in previous works. Exceptionally, the Pt1Co1/C alloy maintained a very important electrocatalytic activity, i.e. a very small variation in current density at 400 mV in electrochemical cell measurements and improved performances in a direct ethanol fuel cell (DEFC). The current densities obtained from the DEFC equipped with a 10% Pt1Co1/C cathode were similar to those obtained when 20% Pt3Cr1/C was used. However, a higher performance in terms of Pt content was shown by PtCo/C. These electrochemical characteristics indicate the advantage of using PtCo alloys as cathodes in DEFCs. Copyright © 2008 Curtin University of Technology and John Wiley & Sons, Ltd.

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Asia-Pacific Journal of Chemical Engineering

Tập 4 Số 1

17-24

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