Electrochemical stability of pt-enriched topmost surface of Ni/Pt(111) prepared by molecular beam epitaxy

N. Todoroki, Y. Iijima, R. Takahashi, Y. Yamada, K. Matsumoto, T. Hayashi, T. Wadayama

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Oxygen reduction reaction (ORR) activity and stability of a molecular beam epitaxially (MBE) prepared Pt-enriched Ni0.3nm/Pt(111) surface was investigated. Reflection high-energy electron diffraction (RHEED) patterns, and a scanning tunneling microscopic (STM) image indicated that the Pt-enriched surface has long-range-ordered six-fold symmetry with atomic-scale corrugations. ORR activity was estimated by kinetically-controlled current density at 0.9 V vs. a reversible hydrogen electrode, and the as-prepared Pt-enriched surface showed 8-times-higher ORR activity than clean Pt(111). The activity steeply reduced during potential cycling between 0.6 V and 1.0 V. After 1000 potential cycles, the enhancement factor was 2.5 and a cyclic voltammetry (CV) curve exhibited an increase in EC charge for the Haddes region accompanied by the emergence of a 0.13 V redox feature caused by (110) surface defects. These results suggest that the electrochemical stability of the underlying Ni atoms determines the durability of Pt-Ni alloy catalysts.

本文言語English
ホスト出版物のタイトルPolymer Electrolyte Fuel Cells 12, PEFC 2012
出版社Electrochemical Society Inc.
ページ1707-1713
ページ数7
2
ISBN(印刷版)9781607683506
DOI
出版ステータスPublished - 2013
イベント12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting - Honolulu, HI, United States
継続期間: 2012 10月 72012 10月 12

出版物シリーズ

名前ECS Transactions
番号2
50
ISSN(印刷版)1938-5862
ISSN(電子版)1938-6737

Other

Other12th Polymer Electrolyte Fuel Cell Symposium, PEFC 2012 - 222nd ECS Meeting
国/地域United States
CityHonolulu, HI
Period12/10/712/10/12

ASJC Scopus subject areas

  • 工学(全般)

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