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Element selective oxidation on Rh–Pd bimetallic alloy surfaces

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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.

Graphical abstract: Element selective oxidation on Rh–Pd bimetallic alloy surfaces

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Publication details

The article was received on 24 Sep 2018, accepted on 24 Oct 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP05998E
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Element selective oxidation on Rh–Pd bimetallic alloy surfaces

    H. Kondoh, R. Toyoshima, N. Shirahata, A. Hoda, M. Yoshida, K. Amemiya, K. Mase and B. S. Mun, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP05998E

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