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Abstract:
The efficiency of polymer electrolyte membrane fuel cells is strongly
depending on the electrocatalyst performance, that is, its activity and
stability. We have designed a catalyst material that combines both, the
high activity for the decisive cathodic oxygen reduction reaction
associated with nanoscale Pt alloys, and the excellent durability of an
advanced nanostructured support. Owing to the high specific activity and
large active surface area, the catalyst shows extraordinary mass
activity values of 1.0 Amg Pt-1. Moreover, the material retains its
initial active surface area and intrinsic activity during an extended
accelerated aging test within the typical operation range. This
excellent performance is achieved by confined-space alloying of the
nanoparticles in a controlled manner in the pores of the support.