Abstract
Hybrid cathode catalysts containing Pt (Pt/CCC, HCC-1) and Pt-alloy (Pt-alloy/CCC, HCC-2) with ultra-low Pt loading were synthesized as cathode catalysts for polymer electrolyte membrane fuel cells (PEMFC). The approach combines a non-platinum carbon based composite catalyst (CCC) containing active catalytic sites for the oxygen reduction reaction (ORR) as a support and highly active Pt/Pt-alloy catalysts. Rotating ring disc electrode (RRDE) and fuel cell studies confirmed the synergistic effect of combining CCC and Pt/Pt-alloy. The HCC catalysts exhibited 2-3 times higher mass activities (0.35 - 0.45 A mgPt-1) than the conventional Pt/C catalyst (0.18-0.24 A mgPt-1). The HCC-2 catalyst exhibited H2-air fuel cell performance of 1.4 A cm-2 at 0.58 ViR-free at a cathode stoic of 2.0.
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