Abstract
The oxygen reduction reaction (ORR) has been studied on kinked stepped surfaces of Pt inside the stereographic triangle with the use of rotating disk electrode (RDE) in 0.1 M HClO4. The kinked stepped surfaces are composed of (331) = 3(111)-(111) structure of which step line contains (100) kink: 3(111) − [m(111) + (100)], where m denotes the number of straight step atoms. The activity for the ORR decreases with increasing the kink atom density d k of the surface with m = 1, 3, 6, and 21, whereas the surface with m = 11 has specifically high activity for the ORR. The activity on Pt(16 15 5) = 3(111) − [11(111)-(100)] exceeds that of Pt(331) that gives the highest activity in stepped surfaces. The electricity of Pt oxide formation on Pt(16 15 5) m = 11 is the lowest in the kinked stepped surfaces examined.
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This work was supported by New Energy Development Organization and Industrial Technology Development Organization and by Japan Synchrotron Radiation Research Institute (JASRI) under proposal no. 2013B1302.
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Sugimura, F., Nakamura, M. & Hoshi, N. The Oxygen Reduction Reaction on Kinked Stepped Surfaces of Pt. Electrocatalysis 8, 46–50 (2017). https://doi.org/10.1007/s12678-016-0339-5
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DOI: https://doi.org/10.1007/s12678-016-0339-5