Oxygen reduction reaction (ORR) catalyst have particles of a first ORR catalytic material in interspersed contact with particles of a second ORR catalytic material. The first and second ORR catalytic materials have different d band centers so that oxygen can adsorb rapidly at a first binding site, be partly reduced, and then transfer to a second site at which reduction is completed and water desorption is rapid. This allows the catalyst to avoid limitations of slow reactant binding and/or slow product release.
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