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

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Title
Operando observations of reactive metal–Oxide structure formation on the Pt3Ni(111)surface at near-ambient pressure
Author(s)
Jeongjin Kim; Won Hui Doh; Hiroshi Kondoh; Kazuhiko Mase; Jean-Jacques Gallet; Fabrice Bournel; Bongjin Simon Mun; Jeong Young Park
Publication Date
2020-01
Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, v.238, no., pp.UNSP146857 -
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2019 Elsevier B.V.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/O2 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
URI
https://pr.ibs.re.kr/handle/8788114/7015
ISSN
0368-2048
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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