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

Martin, R. ; Kim, M. ; Lee, C. J. ; Mehar, V. ; Albertin, S. LU ; Hejral, U. LU ; Merte, L. R. ; Lundgren, E. LU ; Asthagiri, A. and Weaver, J. F. (2020) In Journal of Physical Chemistry Letters 11(17). p.7184-7189
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... (More)

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).

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
11
issue
17
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85090298042
  • pmid:32787312
ISSN
1948-7185
DOI
10.1021/acs.jpclett.0c01805
language
English
LU publication?
yes
id
0a98e2db-38cc-4939-a4b6-8be23077519d
date added to LUP
2021-01-13 23:32:33
date last changed
2024-04-03 20:30:34
@article{0a98e2db-38cc-4939-a4b6-8be23077519d,
  abstract     = {{<p>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). </p>}},
  author       = {{Martin, R. and Kim, M. and Lee, C. J. and Mehar, V. and Albertin, S. and Hejral, U. and Merte, L. R. and Lundgren, E. and Asthagiri, A. and Weaver, J. F.}},
  issn         = {{1948-7185}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{17}},
  pages        = {{7184--7189}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry Letters}},
  title        = {{High-Resolution X-ray Photoelectron Spectroscopy of an IrO<sub>2</sub>(110) Film on Ir(100)}},
  url          = {{http://dx.doi.org/10.1021/acs.jpclett.0c01805}},
  doi          = {{10.1021/acs.jpclett.0c01805}},
  volume       = {{11}},
  year         = {{2020}},
}