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

Ryo Toyoshima; Kenta Amemiya; Kazuhiko Mase; Hiroshi Kondoh

doi:10.1021/acs.jpclett.0c02645

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

Ryo Toyoshima, Kenta Amemiya, Kazuhiko Mase, Hiroshi Kondoh

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	9249-9254
Number of pages	6
Journal	Journal of Physical Chemistry Letters
DOIs	https://doi.org/10.1021/acs.jpclett.0c02645
Publication status	Accepted/In press - 2020

ASJC Scopus subject areas

Materials Science(all)
Physical and Theoretical Chemistry

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@article{12147d80afa34fe28999f049bd7e390f,

title = "Orientation-Dependent Hindrance to the Oxidation of Pd-Au Alloy Surfaces",

abstract = "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.",

author = "Ryo Toyoshima and Kenta Amemiya and Kazuhiko Mase and Hiroshi Kondoh",

note = "Funding Information: We thank the staff of the Keio University Center Service Facilities for Research and the Photon Factory for their technical support. This study was supported by the Grants-in-Aid for scientific research (26248008) and Izumi Science and Technology Foundation (2019-J-076). The experiments were performed under the approval of the Photon Factory Program Advisory Committee (PF PAC 2018S2-005).",

year = "2020",

doi = "10.1021/acs.jpclett.0c02645",

language = "English",

pages = "9249--9254",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

publisher = "American Chemical Society",

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T1 - Orientation-Dependent Hindrance to the Oxidation of Pd-Au Alloy Surfaces

AU - Toyoshima, Ryo

AU - Amemiya, Kenta

AU - Mase, Kazuhiko

AU - Kondoh, Hiroshi

N1 - Funding Information: We thank the staff of the Keio University Center Service Facilities for Research and the Photon Factory for their technical support. This study was supported by the Grants-in-Aid for scientific research (26248008) and Izumi Science and Technology Foundation (2019-J-076). The experiments were performed under the approval of the Photon Factory Program Advisory Committee (PF PAC 2018S2-005).

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

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