High-Resolution X-ray Photoelectron Spectroscopy of an IrO2(110) Film on Ir(100)

Research output: Contribution to journalArticle

Abstract

High-resolution X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) were used to characterize IrO2(110) films on Ir(100) with stoichiometric as well as OH-rich terminations. Core-level Ir 4f and O 1s peaks were identified for the undercoordinated Ir and O atoms and bridging and on-top OH groups at the IrO2(110) surfaces. Peak assignments were validated by comparison of the core-level shifts determined experimentally with those computed using DFT, quantitative analysis of the concentrations of surface species, and the measured variation of the Ir 4f peak intensities with photoelectron kinetic energy. We show that exposure of the IrO2(110) surface to O2 near room temperature produces a large quantity of on-top OH groups because of reaction of background H2 with the surface. The peak assignments made in this study can serve as a foundation for future experiments designed to utilize XPS to uncover atomic-level details of the surface chemistry of IrO2(110).

Details

Authors
Organisations
External organisations
  • Ohio State University
  • Malmö University
  • University of Florida
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)7184-7189
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume11
Issue number17
Publication statusPublished - 2020 Sep 3
Publication categoryResearch
Peer-reviewedYes