TY - JOUR
T1 - Operando observations of reactive metal–Oxide structure formation on the Pt3Ni(111) surface at near-ambient pressure
AU - Kim, Jeongjin
AU - Doh, Won Hui
AU - Kondoh, Hiroshi
AU - Mase, Kazuhiko
AU - Gallet, Jean Jacques
AU - Bournel, Fabrice
AU - Mun, Bongjin Simon
AU - Park, Jeong Young
N1 - Funding Information:
This work was supported by the Institute for Basic Science (IBS) [IBS-R004]. Financial support was also provided by the National Research Foundation of Korea (NRF-2015R1A5A1009962, NRF-2017K1A3A7A09016316) and the GIST Research Institute Grant funded by the Gwangju Institute of Science and Technology (GIST) 2018. The NAP-XPS experiments were performed with approval from the Photon Factory Program Advisory Committee (PF PAC-2016G128).
Funding Information:
This work was supported by the Institute for Basic Science (IBS) [ IBS-R004 ]. Financial support was also provided by the National Research Foundation of Korea ( NRF-2015R1A5A1009962 , NRF-2017K1A3A7A09016316 ) and the GIST Research Institute Grant funded by the Gwangju Institute of Science and Technology (GIST) 2018 . The NAP-XPS experiments were performed with approval from the Photon Factory Program Advisory Committee (PF PAC-2016G128).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1
Y1 - 2020/1
N2 - 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.
AB - 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.
KW - Metal–oxide structure
KW - Near-ambient pressure
KW - Operando observation
KW - Pt-Ni bimetallic catalyst
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U2 - 10.1016/j.elspec.2019.05.006
DO - 10.1016/j.elspec.2019.05.006
M3 - Article
AN - SCOPUS:85066274193
SN - 0368-2048
VL - 238
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
M1 - 146857
ER -