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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
The composite of polypyrrole (PPy) nanowires containing highly dispersed Pt nanoclusters was synthesized on glassy carbon electrode (GCE) utilizing cyclic voltammetry (CV) method. The electrocatalytic activities toward oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) have been investigated by CV and chronoamperometry. The PPy-Pt/GCE provided an ORR peak at about 0.52 V (vs. SCE) at 50 mV s-1. For MOR, a high ratio of forward anodic peak current to reverse anodic peak current was observed, indicating an efficient oxidation of methanol to CO2 on the PPy-Pt/GCE. The higher catalytic activity was attributed to the high dispersion of Pt nanoclusters in the larger surface area of the PPy nanowires and the synergic effect of the novel Pt core - PPy shell. The results revealed that the PPy-Pt nanocomposite was effective electrocatalyst for direct methanol fuel cells (DMFCs).