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International Journal of Electrochemistry
Volume 2014, Article ID 383892, 8 pages
http://dx.doi.org/10.1155/2014/383892
Research Article

Synthesis and Characterization of Electrodeposited C-PANI-Pd-Ni Composite Electrocatalyst for Methanol Oxidation

1Department of Chemistry, Birla Institute of Technology (Mesra), Ranchi, Jharkhand 835215, India
2Department of Chemistry, Government Engineering College, Ramgarh, Jharkhand 829122, India
3Department of Chemical & Polymer Engineering, Birla Institute of Technology (Mesra), Ranchi, Jharkhand 835215, India

Received 7 August 2014; Revised 30 September 2014; Accepted 30 September 2014; Published 16 October 2014

Academic Editor: Hamilton Varela

Copyright © 2014 S. S. Mahapatra et al. 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

Electropolymerization of aniline at the graphite electrodes was achieved by potentiodynamic method. Electrodeposition of Pd (C-PANI-Pd) and Ni (C-PANI-Ni) and codeposition of Pd-Ni (C-PANI-Pd-Ni) microparticles into the polyaniline (PANI) film coated graphite (C-PANI) were carried out under galvanostatic control. The morphology and composition of the composite electrodes were obtained using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX) techniques. The electrochemical behavior and electrocatalytic activity of the electrode were characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometric (CA) methods in acidic medium. The C-PANI-Pd-Ni electrode showed an improved catalytic performance towards methanol oxidation in terms of lower onset potential, higher anodic oxidation current, greater stability, lower activation energy, and lower charge transfer resistance. The enhanced electrocatalytic activity might be due to the greater permeability of C-PANI films for methanol molecules, better dispersion of Pd-Ni microparticles into the polymer matrixes, and the synergistic effects between the dispersed metal particles and their matrixes.