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International Journal of Electrochemistry
Volume 2011, Article ID 563495, 16 pages
http://dx.doi.org/10.4061/2011/563495
Research Article

Characterization of Pt-Pd/C Electrocatalyst for Methanol Oxidation in Alkaline Medium

1Department of Chemical and Polymer Engineering, Birla Institute of Technology, Mesra, Jharkhand, Ranchi 835 215, India
2Department of Chemistry, Bengal Engineering and Science University, Shibpur, West Bengal, Howrah 711 103, India

Received 14 March 2011; Accepted 4 July 2011

Academic Editor: Pei Kang Shen

Copyright © 2011 S. S. Mahapatra and J. Datta. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Pt-Pd/C electrocatalyst was synthesized on graphite substrate by the electrochemical codeposition technique. The physicochemical characterization of the catalyst was done by SEM, XRD, and EDX. The electrochemical characterization of the Pt-Pd/C catalyst for methanol electro-oxidation was studied over a range of NaOH and methanol concentrations using cyclic voltammetry, quasisteady-state polarization, chronoamperometry, and electrochemical impedance spectroscopy. The activity of methanol oxidation increased with pH due to better OH species coverage on the electrode surface. At methanol concentration (>1.0 M), there is no change in the oxidation peak current density because of excess methanol at the electrode surface and/or depletion of OH at the electrode surface. The Pt-Pd/C catalyst shows good stability and the low value of Tafel slope and charge transfer resistance. The enhanced electrocatalytic activity of the electrodes is ascribed to the synergistic effect of higher electrochemical surface area, preferred OH adsorption, and ad-atom contribution on the alloyed surface.