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

Jeongjin Kim, Won Hui Doh, Hiroshi Kondoh, Kazuhiko Mase, Jean Jacques Gallet, Fabrice Bournel, Bongjin Simon Mun, Jeong Young Park

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
JournalJournal of Electron Spectroscopy and Related Phenomena
DOIs
Publication statusPublished - 2019 Jan 1

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X ray photoelectron spectroscopy
Scanning tunneling microscopy
Carbon Monoxide
Carbon monoxide
photoelectron spectroscopy
Gases
carbon monoxide
scanning tunneling microscopy
Surface segregation
Binding energy
x rays
Oxides
Nanostructures
Catalyst activity
thermodynamic equilibrium
Skin
Thermodynamics
catalytic activity
Oxygen
binding energy

Keywords

  • Metal–oxide structure
  • Near-ambient pressure
  • Operando observation
  • Pt-Ni bimetallic catalyst

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

Cite this

Operando observations of reactive metal–Oxide structure formation on the Pt3Ni(111)surface at near-ambient pressure. / Kim, Jeongjin; Doh, Won Hui; Kondoh, Hiroshi; Mase, Kazuhiko; Gallet, Jean Jacques; Bournel, Fabrice; Mun, Bongjin Simon; Park, Jeong Young.

In: Journal of Electron Spectroscopy and Related Phenomena, 01.01.2019.

Research output: Contribution to journalArticle

Kim, Jeongjin ; Doh, Won Hui ; Kondoh, Hiroshi ; Mase, Kazuhiko ; Gallet, Jean Jacques ; Bournel, Fabrice ; Mun, Bongjin Simon ; Park, Jeong Young. / Operando observations of reactive metal–Oxide structure formation on the Pt3Ni(111)surface at near-ambient pressure. In: Journal of Electron Spectroscopy and Related Phenomena. 2019.
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AU - Mase, Kazuhiko

AU - Gallet, Jean Jacques

AU - Bournel, Fabrice

AU - Mun, Bongjin Simon

AU - Park, Jeong Young

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