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Probing surface-sensitive redox properties of VOx/TiO2 catalyst nanoparticles

Ek, Martin LU orcid ; Arnarson, Logi ; Moses, Poul Georg ; Rasmussen, Søren B. ; Skoglundh, Magnus ; Olsson, Eva and Helveg, Stig (2021) In Nanoscale 13(15). p.7266-7272
Abstract
Redox processes of oxide materials are fundamental in catalysis. These processes depend on the surface structure and stoichiometry of the oxide and are therefore expected to vary between surface facets. However, there is a lack of direct measurements of redox properties on the nanoscale for analysing the importance of such faceting effects in technical materials. Here, we address the facet-dependent redox properties of vanadium-oxide-covered anatase nanoparticles of relevance to, e.g., selective catalytic reduction of nitrogen oxides. The vanadium oxidation states at individual nanoscale facets are resolved in situ under catalytically relevant conditions by combining transmission electron microscopy imaging and electron... (More)
Redox processes of oxide materials are fundamental in catalysis. These processes depend on the surface structure and stoichiometry of the oxide and are therefore expected to vary between surface facets. However, there is a lack of direct measurements of redox properties on the nanoscale for analysing the importance of such faceting effects in technical materials. Here, we address the facet-dependent redox properties of vanadium-oxide-covered anatase nanoparticles of relevance to, e.g., selective catalytic reduction of nitrogen oxides. The vanadium oxidation states at individual nanoscale facets are resolved in situ under catalytically relevant conditions by combining transmission electron microscopy imaging and electron energy loss spectroscopy. The measurements reveal that vanadium on {001} facets consistently retain higher oxidation states than on {10l} facets. Insight into such structure-sensitivity of surface redox processes opens prospects of tailoring oxide nanoparticles with enhanced catalytic functionalities. (Less)
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author
; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
13
issue
15
pages
7 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85105114563
ISSN
2040-3372
DOI
10.1039/D0NR08943E
project
Understanding of Catalysts for Climate-Neutral Chemicals by in situ Transmission Electron Microscopy Characterization
language
English
LU publication?
no
id
ca1e740a-9ac3-440c-8575-9a9be2ebd840
date added to LUP
2022-01-18 09:52:42
date last changed
2022-04-27 07:11:52
@article{ca1e740a-9ac3-440c-8575-9a9be2ebd840,
  abstract     = {{Redox processes of oxide materials are fundamental in catalysis. These processes depend on the surface structure and stoichiometry of the oxide and are therefore expected to vary between surface facets. However, there is a lack of direct measurements of redox properties on the nanoscale for analysing the importance of such faceting effects in technical materials. Here, we address the facet-dependent redox properties of vanadium-oxide-covered anatase nanoparticles of relevance to, <em>e.g.</em>, selective catalytic reduction of nitrogen oxides. The vanadium oxidation states at individual nanoscale facets are resolved <em>in situ</em> under catalytically relevant conditions by combining transmission electron microscopy imaging and electron energy loss spectroscopy. The measurements reveal that vanadium on {001} facets consistently retain higher oxidation states than on {10<em>l</em>} facets. Insight into such structure-sensitivity of surface redox processes opens prospects of tailoring oxide nanoparticles with enhanced catalytic functionalities.}},
  author       = {{Ek, Martin and Arnarson, Logi and Moses, Poul Georg and Rasmussen, Søren B. and Skoglundh, Magnus and Olsson, Eva and Helveg, Stig}},
  issn         = {{2040-3372}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{15}},
  pages        = {{7266--7272}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Nanoscale}},
  title        = {{Probing surface-sensitive redox properties of VO<sub>x</sub>/TiO<sub>2</sub> catalyst nanoparticles}},
  url          = {{http://dx.doi.org/10.1039/D0NR08943E}},
  doi          = {{10.1039/D0NR08943E}},
  volume       = {{13}},
  year         = {{2021}},
}