Journal
ELECTROCHIMICA ACTA
Volume 82, Issue -, Pages 512-516Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.03.133
Keywords
High index planes; Step; Active site; Oxide film
Categories
Funding
- New Energy Development Organization
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The oxygen reduction reaction (ORR) have been studied on n(1 1 1)-(1 0 0) series of Pt using hanging meniscus rotating disk electrode (HMRDE) in 0.1 M HClO4 (n is the number of terrace atomic rows). The activity for the ORR, which is estimated by the reduction current density at 0.90 V (RHE)j(ORR,0.90V), increases linearly with the increase of the step atom density d(S) on the surfaces with 5 <= n. On the surfaces with n < 5, however, the activity for the ORR decreases with the increase of d(S). The deactivation of the ORR on the surfaces with n < 5 correlates with the formation of PtO-like species at the step. (C) 2012 Elsevier Ltd. All rights reserved.
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