Abstract
Molybdenum carbide (Mo2C) particles on carbonized resin (C–Mo2C) were successfully synthesized through ionic exchange process. The diameter from 3nm to 50nm of the Mo2C particles can be easily controlled by adjusting the experimental parameters. Pt nanoparticles were then loaded on the C–Mo2C to form Pt/C–Mo2C electrocatalyst for methanol oxidation in acidic media. The above materials were characterized by XRD, TEM, TG, EDS, XPS and cyclic voltammograms measurements. The results show that Pt/C–Mo2C gives 1.7 times higher peak current density and 100mV more negative onset potential than that of commercial Pt/C electrocatalyst at the same Pt loadings. Moreover, Pt/C–Mo2C shows higher electrochemical stability than that of Pt/C. The improved catalytic activity is due to the synergistic effect of Mo2C on Pt; the improved electrochemical stability is related to the strong interaction force between Pt and Mo2C. Since Pt/C–Mo2C carries higher catalytic activity and stability comparing with Pt/C, less Pt will be required for the same performance and it will in turn reduce the cost of fuel cell electrocatalyst.
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