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 journalArticlepeer-review

5 Citations (Scopus)


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
Article number146857
JournalJournal of Electron Spectroscopy and Related Phenomena
Publication statusPublished - 2020 Jan


  • 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


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