Element selective oxidation on Rh-Pd bimetallic alloy surfaces

Hiroshi Kondoh, Ryo Toyoshima, Naoki Shirahata, Asami Hoda, Masaaki Yoshida, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun

研究成果: Article査読

3 被引用数 (Scopus)

抄録

The interactions between oxygen and Rh-Pd bimetallic alloy surfaces were investigated using surface sensitive experimental techniques and density functional theory calculations. The alloy surfaces were oxidized under 10-5 Torr and 100 mTorr oxygen upon heating above 250 °C. A thin Rh oxide layer was preferentially formed on a Rh1Pd9(100) surface, while a thin Pd oxide layer was formed on a Rh1Pd9(111) surface, though the Rh oxide is thermodynamically more stable irrespective of the surface orientation. Chemical analyses revealed that the initial Rh fraction for the (111) surface was significantly lower than that for the (100) surface, which suggests that the oxidized element on the surface is kinetically selected depending on the near surface initial composition.

本文言語English
ページ(範囲)28419-28424
ページ数6
ジャーナルPhysical Chemistry Chemical Physics
20
45
DOI
出版ステータスPublished - 2018

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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