Structural effects on the oxygen reduction reaction on the high index planes of Pt3Co
文献情報
Yuki Takesue, Masashi Nakamura, Nagahiro Hoshi
The oxygen reduction reaction (ORR) has been studied on the n(111)–(111) and n(111)–(100) series of Pt3Co using a hanging meniscus rotating disk electrode (HMRDE) in 0.1 M HClO4 (n is the number of terrace atomic rows). The activity for the ORR on the n(111)–(111) series, which is estimated by the specific activity at 0.90 V (RHE) jk, increases linearly with an increase in the step atom density dS. On the other hand, the activity for the ORR on the n(111)–(100) series increases linearly with an increase of dS on the surfaces with n ≥ 9. On the surfaces with n < 9, however, the activity for the ORR decreases with an increase of dS. We find a correlation between the ORR activity and θOH at the step on the assumption that all the oxide species are Pt–OH.
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