Abstract
We report 2 to 3 fold enhancement in activity for CO oxidation in PEM fuel cell by highly dispersed carbon supported PtMo alloy nano-crystals (PtMo/C) as compared to the current state of the art PtRu/C at 85°C with 100 ppm CO in H 2 . The half-cell polarization characteristics show a lower susceptibility to changes as a function of temperature (below 100°C), CO concentration (5-100 ppm) and alloy composition (1:1 to 1:5, Mo:Pt) in contrast to Pt/C and PtRu/C. Cyclic voltammograms show both Pt and Mo features and a redox couple involving Mo (at ∼0.5 V). CO stripping voltammograms show two peaks, the first at low overpotentials (∼0.05 V) followed by a second initiated at ∼ 0.5 V, the second peak is akin to oxidation of CO on Pt/C. Preliminary analysis of the Mo K edge XANES confirmed the presence of Mo as an oxide at potentials as low as 0.0 V and the redox couple at ∼ 0.5 V.
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