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Role of dopant ions in electrocatalytic oxidation of methanol using conducting polypyrrole electrodes
Published in
Volume: 155
Issue: 2
Pages: 157 - 160
Conducting polypyrrole electrodes obtained by electro-polymerization of pyrrole on vacuum metallized glass substrates are modified by doping with a range of metal halides as dopant ions having different electronegativity. Electro-oxidation of methanol using these electrodes is studied by means of cyclic voltammetry in 0.1 M HClO4 as supporting electrolyte. It is found that the electronegativity of the dopant ion plays a very important role in the electrocatalytic activity. Polypyrrole doped with zirconium chloride gives the highest anodic current of 10 mA cm-2 at the oxidation potential of methanol. The results are explained on the basis of the charge-transfer efficiency at the electrode|electrolyte interface, which is associated with the acceptor state created by the dopant in the semi-conducting polymer. © 2005.
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JournalJournal of Power Sources
Open AccessNo