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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)28419-28424
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number45
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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  • Cite this

    Kondoh, H., Toyoshima, R., Shirahata, N., Hoda, A., Yoshida, M., Amemiya, K., Mase, K., & Mun, B. S. (2018). Element selective oxidation on Rh-Pd bimetallic alloy surfaces. Physical Chemistry Chemical Physics, 20(45), 28419-28424. https://doi.org/10.1039/c8cp05998e