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

Ryo Toyoshima, Kenta Amemiya, Kazuhiko Mase, Hiroshi Kondoh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)9249-9254
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number21
Publication statusPublished - 2020 Nov 5

ASJC Scopus subject areas

  • General Materials Science
  • Physical and Theoretical Chemistry


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