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Oxidation of Ultrathin FeO(111) Grown on Pt(111) : Spectroscopic Evidence for Hydroxylation

Johansson, Niclas LU ; Merte, Lindsay R. LU ; Grånäs, Elin LU ; Wendt, Stefan ; Andersen, Jesper N. LU ; Schnadt, Joachim LU orcid and Knudsen, Jan LU (2016) In Topics in Catalysis 59(5-7). p.506-515
Abstract

Using high resolution and ambient pressure X-ray photoelectron spectroscopy we show that the catalytically active FeO $$-{2}$$ 2 trilayer films grown on Pt(111) are very active for water dissociation, in contrast to inert FeO(111) bilayer films. The FeO $$-{2}$$ 2 trilayer is so active for water dissociation that it becomes hydroxylated upon formation, regardless of the applied preparation method. FeO $$-{2}$$ 2 trilayers were grown by oxidation of FeO(111) bilayer films either with molecular oxygen in the mbar regime, or by NO $$-2$$ 2 and atomic oxygen exposures, respectively, in the ultrahigh vacuum regime. Because it was impossible to prepare clean FeO $$-{2}$$ 2 without any hydroxyls we propose that catalytically highly active FeO... (More)

Using high resolution and ambient pressure X-ray photoelectron spectroscopy we show that the catalytically active FeO $$-{2}$$ 2 trilayer films grown on Pt(111) are very active for water dissociation, in contrast to inert FeO(111) bilayer films. The FeO $$-{2}$$ 2 trilayer is so active for water dissociation that it becomes hydroxylated upon formation, regardless of the applied preparation method. FeO $$-{2}$$ 2 trilayers were grown by oxidation of FeO(111) bilayer films either with molecular oxygen in the mbar regime, or by NO $$-2$$ 2 and atomic oxygen exposures, respectively, in the ultrahigh vacuum regime. Because it was impossible to prepare clean FeO $$-{2}$$ 2 without any hydroxyls we propose that catalytically highly active FeO $$-{2}$$ 2 trilayer films are generally hydroxylated. In addition, we provide spectroscopic fingerprints both for Pt(111)-supported FeO(111) and FeO $$-2$$ 2 films that can serve as reference for future in situ studies.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydroxylation, Iron oxide monolayers, Spectroscopy, Ultra-thin films
in
Topics in Catalysis
volume
59
issue
5-7
pages
10 pages
publisher
Springer
external identifiers
  • wos:000371424800010
  • scopus:84959497972
ISSN
1022-5528
DOI
10.1007/s11244-015-0521-7
language
English
LU publication?
yes
id
082c9a62-90bd-460c-a425-57b51c279fd1
date added to LUP
2016-07-14 11:59:19
date last changed
2025-10-14 11:21:05
@article{082c9a62-90bd-460c-a425-57b51c279fd1,
  abstract     = {{<p>Using high resolution and ambient pressure X-ray photoelectron spectroscopy we show that the catalytically active FeO $$-{2}$$ 2 trilayer films grown on Pt(111) are very active for water dissociation, in contrast to inert FeO(111) bilayer films. The FeO $$-{2}$$ 2 trilayer is so active for water dissociation that it becomes hydroxylated upon formation, regardless of the applied preparation method. FeO $$-{2}$$ 2 trilayers were grown by oxidation of FeO(111) bilayer films either with molecular oxygen in the mbar regime, or by NO $$-2$$ 2 and atomic oxygen exposures, respectively, in the ultrahigh vacuum regime. Because it was impossible to prepare clean FeO $$-{2}$$ 2 without any hydroxyls we propose that catalytically highly active FeO $$-{2}$$ 2 trilayer films are generally hydroxylated. In addition, we provide spectroscopic fingerprints both for Pt(111)-supported FeO(111) and FeO $$-2$$ 2 films that can serve as reference for future in situ studies.</p>}},
  author       = {{Johansson, Niclas and Merte, Lindsay R. and Grånäs, Elin and Wendt, Stefan and Andersen, Jesper N. and Schnadt, Joachim and Knudsen, Jan}},
  issn         = {{1022-5528}},
  keywords     = {{Hydroxylation; Iron oxide monolayers; Spectroscopy; Ultra-thin films}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{5-7}},
  pages        = {{506--515}},
  publisher    = {{Springer}},
  series       = {{Topics in Catalysis}},
  title        = {{Oxidation of Ultrathin FeO(111) Grown on Pt(111) : Spectroscopic Evidence for Hydroxylation}},
  url          = {{http://dx.doi.org/10.1007/s11244-015-0521-7}},
  doi          = {{10.1007/s11244-015-0521-7}},
  volume       = {{59}},
  year         = {{2016}},
}