Journal
JOURNAL OF POWER SOURCES
Volume 133, Issue 2, Pages 155-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2004.02.008
Keywords
methanol oxidation; DMFC; conducting polymers; nanostructured materials; electro-catalyst
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The electrochemical synthesis of conducting nanocones of Pt incorporated poly(3-methyl) thiophene, employing alumina membrane templates and its use as an electrode material for methanol oxidation is reported. The activity (131 mA/cm(2) at +0.4 V versus Ag/AgCl for a Pt loading of 80 mug/cm(2)) of nanocone-based electrode was found to be more than one order of magnitude higher compared to the regular poly(3-methyl) thiophene electrode (12.2 mA/cm(2) at +0.4 V versus Ag/AgCl for a Pt loading of 80 mug/cm(2)). The chronoamperometric response confirms the better activity and stability of the nanocone-based electrode compared to the commercial 20 wt.% Pt/C (E-TEK) and template-free electrode. The XPS data confirmed the presence of Pt in the metallic state. The nanocone morphology of poly(3-methyl) thiophene, helps in the effective dispersion of Pt particles facilitating the easier access of methanol to the catalytic sites. (C) 2004 Elsevier B.V. All rights reserved.
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