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(a) CVs and (b) ORR voltammograms of PtNi/Pt(111) alloyed with 450 pmol Ni at 723 K during the potential cycles. CVs were obtained in 0.1 M HClO4 saturated with Ar. The scanning rate is 0.05 V s–1. ORR voltammograms were obtained in 0.1 M HClO4 saturated with O2. The scanning rate is 0.01 V s–1 and the rotation rate of the electrode is 1600 rpm. (c) Cycle dependence of normalized ORR current density at 0.9 V.
