Abstract
In this work, a layer-by-layer (LbL) electrochemical assembly was fabricated comprising alternating layers of poly(diphenylamine) (PDPA), phosphomolybdic acid (PMA) and Pt particles on a pencil graphite electrode (PGE) surface to prepare a modified electrode for effective oxidation of methanol. For this purpose, initially, the PGE surface was covered with a mixture of chitosan and multi-walled carbon nanotubes (MWCNTs); a layer of oxidized PDPA as a cationic layer was then deposited on the electrode surface by electropolymerization. Next, the anionic PMA was adsorbed on the cationic layer of PDPA via electrostatic forces. Finally, Pt particles were deposited on the electrode surface. This process was repeated several times to obtain multilayer film (Pt/PMA/PDPA)n on the chitosan-MWCNTs/PGE surface, where n is the number of triplet layers. The oxidation current of methanol was substantially increased with an increase to four layers. This study showed that the modified electrode, with good catalytic activity, can be applied as an anode material in direct methanol fuel cells.
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