Five carbon-supported Pt/Ru-based catalysts (Pt/Ru, Pt/Ru/Os, Pt/Ru/Au, Pt / Ru / SnO x , and Pt / Ru / WO x ) were studied for electro-oxidation of H 2 and H 2 with 1% CO at the anode of a proton exchange membrane fuel cell. For H 2 oxidation, the performance of the Pt/Ru anode was not affected by addition of W, Os, and Au. However, the Pt / Ru / SnO x catalyst was found to result in a very poor performance for H 2 oxidation. For electro-oxidation of H 2 with 1% CO, the Pt / Ru / WO x catalyst was the most active catalyst and the Pt/Ru/Au catalyst was the poorest. Pt / Ru / WO x was almost twice as active as the Pt/Ru catalyst at practical potentials. A new intermediate mechanism was proposed to explain the CO tolerance of Pt/Ru-based catalysts.
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He et al. (2003) studied this question.
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