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Redox dynamics of 2D crystalline vanadium oxide phases on high-index anatase facets

Ek, Martin LU orcid ; Godiksen, Anita ; Arnarson, Logi ; Moses, Poul Georg ; Rasmussen, Søren B. ; Skoglundh, Magnus ; Olsson, Eva and Helveg, Stig (2023) In Nanoscale 15(21). p.9503-9509
Abstract

Vanadium oxides exist in a multitude of phases with varying structure and stoichiometry. This abundance of phases can be extended through the use of other oxides as supports, and through redox treatments. However, the combined effects of different supports and redox treatments can be difficult to identify, particularly when present as different terminating facets on nanoparticles. Here, we examine structural dynamics of 2D vanadium oxides supported on anatase TiO2 nanoparticles, correlated with changes in oxidation state, using in situ transmission electron microscopy imaging and electron energy loss spectroscopy. As the average oxidation state is reduced below V(iv), an ordered cubic V(ii) phase is observed exclusively at... (More)

Vanadium oxides exist in a multitude of phases with varying structure and stoichiometry. This abundance of phases can be extended through the use of other oxides as supports, and through redox treatments. However, the combined effects of different supports and redox treatments can be difficult to identify, particularly when present as different terminating facets on nanoparticles. Here, we examine structural dynamics of 2D vanadium oxides supported on anatase TiO2 nanoparticles, correlated with changes in oxidation state, using in situ transmission electron microscopy imaging and electron energy loss spectroscopy. As the average oxidation state is reduced below V(iv), an ordered cubic V(ii) phase is observed exclusively at the high-index {10l} facets of the support. This local accommodation of highly reduced states is necessary for explaining the observed range of average oxidation states. In turn, the findings show that oxidation states extending from V(v)-V(iv) to V(ii) can be simultaneously stabilized by different supporting oxide surfaces during exposure to atmospheres with controlled redox potential.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
15
issue
21
pages
7 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:37170698
  • scopus:85159374378
ISSN
2040-3364
DOI
10.1039/d2nr07067g
language
English
LU publication?
yes
id
2a798354-f872-4691-91bc-eb2142d7dbed
date added to LUP
2023-08-14 14:52:01
date last changed
2024-04-20 00:32:10
@article{2a798354-f872-4691-91bc-eb2142d7dbed,
  abstract     = {{<p>Vanadium oxides exist in a multitude of phases with varying structure and stoichiometry. This abundance of phases can be extended through the use of other oxides as supports, and through redox treatments. However, the combined effects of different supports and redox treatments can be difficult to identify, particularly when present as different terminating facets on nanoparticles. Here, we examine structural dynamics of 2D vanadium oxides supported on anatase TiO<sub>2</sub> nanoparticles, correlated with changes in oxidation state, using in situ transmission electron microscopy imaging and electron energy loss spectroscopy. As the average oxidation state is reduced below V(iv), an ordered cubic V(ii) phase is observed exclusively at the high-index {10l} facets of the support. This local accommodation of highly reduced states is necessary for explaining the observed range of average oxidation states. In turn, the findings show that oxidation states extending from V(v)-V(iv) to V(ii) can be simultaneously stabilized by different supporting oxide surfaces during exposure to atmospheres with controlled redox potential.</p>}},
  author       = {{Ek, Martin and Godiksen, Anita and Arnarson, Logi and Moses, Poul Georg and Rasmussen, Søren B. and Skoglundh, Magnus and Olsson, Eva and Helveg, Stig}},
  issn         = {{2040-3364}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{21}},
  pages        = {{9503--9509}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Nanoscale}},
  title        = {{Redox dynamics of 2D crystalline vanadium oxide phases on high-index anatase facets}},
  url          = {{http://dx.doi.org/10.1039/d2nr07067g}},
  doi          = {{10.1039/d2nr07067g}},
  volume       = {{15}},
  year         = {{2023}},
}