Operando observations of reactive metal-Oxide structure formation on the Pt3Ni(111) surface at near-ambient pressure

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The formation of interfacial metal-oxide structures on the Pt3Ni(111) bimetallic surface was investigated using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) techniques at near-ambient pressure (NAP). Direct observation of surface images clearly shows the occurrence of surface segregation of the sub-surface Ni depending on the surrounding gas-phase conditions. Especially, the prepared topmost Pt-skin layer of the Pt3Ni(111) is altered by Ni oxide segregation that makes an interfacial Pt-NiO1-x nanostructure with dissociated oxygen. This metal-oxide interface could provide active sites for more-efficient carbon monoxide (CO) conversion processes under mixed CO/O-2 gas environments; the associated specific chemical binding energy was identified using NAP-XPS. The combined operando observations from the NAP-STM and NAP-XPS on the Pt3Ni(111) surface reveal that the interfacial metal-oxide structure is strongly correlated with the origin of the enhanced catalytic activity at thermodynamic equilibrium.
Publisher
ELSEVIER
Issue Date
2020-01
Language
English
Article Type
Article; Proceedings Paper
Citation

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, v.238

ISSN
0368-2048
DOI
10.1016/j.elspec.2019.05.006
URI
http://hdl.handle.net/10203/272229
Appears in Collection
CH-Journal Papers(저널논문)
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