Orientation-Dependent Hindrance to the Oxidation of Pd-Au Alloy Surfaces

Ryo Toyoshima, Kenta Amemiya, Kazuhiko Mase, Hiroshi Kondoh

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Oxidation of monometallic Pd and bimetallic Pd3Au alloy surfaces are observed by in situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) at an elevated pressure (100 mTorr O2 ambient). It is directly evidenced that the alloying with Au hinders the surface oxidation of Pd3Au surfaces compared with monometallic Pd surfaces. Remarkably, the oxidation behavior is clearly different between Pd3Au(111) and (100) surfaces. The (100) surface has a relatively Pd-rich surface composition, and the surface oxide layer is formed, whereas the (111) surface has a Au-rich composition, and the surface oxidation is quite limited. A combined approach of experimental and theoretical techniques reveals that Pd/Au surface composition and atomic arrangement are key factors determining the oxidation behavior.

本文言語English
ページ(範囲)9249-9254
ページ数6
ジャーナルJournal of Physical Chemistry Letters
DOI
出版ステータスAccepted/In press - 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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