Electro-oxidation of H-2 and CO/H-2-mixtures on a carbon-supported Pt3Sn catalyst

We present results of a rotating disk electrode (RDE) study on the electro- oxidation of CO contaminated H-2 feed gas (100 ppm - 2%) over a Vulcan supp orted Pt3Sn catalyst, applying a newly developed thin-film RDE method dor t he measurement of high surface area catalysts. Measurements under fuel cell relevant conditions (steady state, continuous gas flow, 60 degrees C) show a significant improved CO tolerance as compared to state-of-the-art Pt and Pt0.5Ru0.5 anode catalysts, with an overpotential of 230 mV for 250 ppm an d only 170 mV for 100 ppm CO/H-2 at a mass-specific current density of 0.5 A/mg(metal), respectively.