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Oxidation and Reduction of Ir(100) Studied by High-Energy Surface X-ray Diffraction

Albertin, Stefano LU ; Merte, Lindsay R. ; Lundgren, Edvin LU ; Martin, Rachel ; Weaver, Jason F. ; Dippel, Ann Christin ; Gutowski, Olof and Hejral, Uta LU (2022) In Journal of Physical Chemistry C 126(11). p.5244-5255
Abstract

The oxidation and reduction of an Ir(100) surface using 2.5, 5, and 10 mbar O2partial pressure and a sample temperature of 775 K have been studied by using high-energy surface X-ray diffraction (HESXRD) which allowed to record large volumes of reciprocal space in short time periods. The complex 3D diffraction patterns could be disentangled in a stepwise procedure. For the 2.5 mbar experiment the measurements indicate the formation of an Ir(100)-O c(2 × 2) oxygen superstructure along with the onset of epitaxial IrO2(110) bulk oxide formation. For the 5 and 10 mbar O2partial pressures the formation of additional IrO2bulk oxide epitaxies with (100) and (101) orientations as well as of... (More)

The oxidation and reduction of an Ir(100) surface using 2.5, 5, and 10 mbar O2partial pressure and a sample temperature of 775 K have been studied by using high-energy surface X-ray diffraction (HESXRD) which allowed to record large volumes of reciprocal space in short time periods. The complex 3D diffraction patterns could be disentangled in a stepwise procedure. For the 2.5 mbar experiment the measurements indicate the formation of an Ir(100)-O c(2 × 2) oxygen superstructure along with the onset of epitaxial IrO2(110) bulk oxide formation. For the 5 and 10 mbar O2partial pressures the formation of additional IrO2bulk oxide epitaxies with (100) and (101) orientations as well as of polycrystalline IrO2was observed. Upon CO reduction, we found the IrO2islands to be reduced into epitaxial and metallic Ir(111) and (221) oriented islands.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
126
issue
11
pages
12 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85125390778
ISSN
1932-7447
DOI
10.1021/acs.jpcc.1c10250
language
English
LU publication?
yes
id
9b8c440f-97d9-4ccf-aa36-98f33c0ee82b
date added to LUP
2022-04-13 17:16:30
date last changed
2023-11-26 09:08:38
@article{9b8c440f-97d9-4ccf-aa36-98f33c0ee82b,
  abstract     = {{<p>The oxidation and reduction of an Ir(100) surface using 2.5, 5, and 10 mbar O<sub>2</sub>partial pressure and a sample temperature of 775 K have been studied by using high-energy surface X-ray diffraction (HESXRD) which allowed to record large volumes of reciprocal space in short time periods. The complex 3D diffraction patterns could be disentangled in a stepwise procedure. For the 2.5 mbar experiment the measurements indicate the formation of an Ir(100)-O c(2 × 2) oxygen superstructure along with the onset of epitaxial IrO<sub>2</sub>(110) bulk oxide formation. For the 5 and 10 mbar O<sub>2</sub>partial pressures the formation of additional IrO<sub>2</sub>bulk oxide epitaxies with (100) and (101) orientations as well as of polycrystalline IrO<sub>2</sub>was observed. Upon CO reduction, we found the IrO<sub>2</sub>islands to be reduced into epitaxial and metallic Ir(111) and (221) oriented islands.</p>}},
  author       = {{Albertin, Stefano and Merte, Lindsay R. and Lundgren, Edvin and Martin, Rachel and Weaver, Jason F. and Dippel, Ann Christin and Gutowski, Olof and Hejral, Uta}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{11}},
  pages        = {{5244--5255}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Oxidation and Reduction of Ir(100) Studied by High-Energy Surface X-ray Diffraction}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.1c10250}},
  doi          = {{10.1021/acs.jpcc.1c10250}},
  volume       = {{126}},
  year         = {{2022}},
}