Abstract
In order to examine the relationship between the oxygen reduction reaction (ORR) activity of a fuel cell catalyst and its structure and/or electronic state, carbon-supported Pt and Pt alloys having various structures, compositions, and morphologies were studied. Regardless of the atomic ordering or morphology (core–shell or random alloy) of the catalyst, the ORR activity was primarily dependent on the Pt–Pt bond distance. Among these materials, Pt2Co, having the shortest Pt–Pt distance, exhibited the highest ORR activity. The activities of this catalyst per unit surface area and per unit mass were approximately 10 times and 6 times higher than those of a commercially available carbon supported Pt electrocatalyst (Pt/C). This work also found a monotonic increase in catalytic activity with decreasing Pt–Pt distance.
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