Abstract
Metal oxides prepared by thermal decomposition of metal acetylacetonate (acac) complexes have a significant support effect on platinum catalyzed oxidation of ethanol. Ru and Sn oxides and mixed Ru-Sn oxides deposited onto Ti foils and high surface area carbon support materials were drop coated with preformed Pt nanoparticles. Cyclic voltammetry in H2SO4(aq) and polarization experiments in proton exchange membrane cells have demonstrated great versatility for screening the co-catalytic effects of oxide layers and scale-up to fuel cell testing. A strong synergistic effect has been observed between Ru and Sn oxide in both environments, with a 2:1 ratio of Ru(acac)3 to Sn(acac)2 ratio in the oxide precursor solution producing the most active catalyst. Electrodes prepared by using Pb(acac)2, In(acac)3 and MoO2(acac)2 also provided substantially enhanced activities for ethanol oxidation.
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