Visualizing atomic-scale redox dynamics in vanadium oxide-based catalysts
Ek, Martin LU
; Ramasse, Quentin M.
; Arnarson, Logi
; Georg Moses, Poul
and Helveg, Stig
(2017)
In Nature Communications
8(1).
- Abstract
Surface redox processes involving oxygen atom exchange are fundamental in catalytic reactions mediated by metal oxides. These processes are often difficult to uncover due to changes in the surface stoichiometry and atomic arrangement. Here we employ high-resolution transmission electron microscopy to study vanadium oxide supported on titanium dioxide, which is of relevance as a catalyst in, e.g., nitrogen oxide emission abatement for environmental protection. The observations reveal a reversible transformation of the vanadium oxide surface between an ordered and disordered state, concomitant with a reversible change in the vanadium oxidation state, when alternating between oxidizing and reducing conditions. The transformation depends on... (More)
Surface redox processes involving oxygen atom exchange are fundamental in catalytic reactions mediated by metal oxides. These processes are often difficult to uncover due to changes in the surface stoichiometry and atomic arrangement. Here we employ high-resolution transmission electron microscopy to study vanadium oxide supported on titanium dioxide, which is of relevance as a catalyst in, e.g., nitrogen oxide emission abatement for environmental protection. The observations reveal a reversible transformation of the vanadium oxide surface between an ordered and disordered state, concomitant with a reversible change in the vanadium oxidation state, when alternating between oxidizing and reducing conditions. The transformation depends on the anatase titanium dioxide surface termination and the vanadium oxide layer thickness, suggesting that the properties of vanadium oxide are sensitive to the supporting oxide. These atomic-resolution observations offer a basis for rationalizing previous reports on shape-sensitive catalytic properties.
(Less)
- author
- Ek, Martin
LU
; Ramasse, Quentin M.
; Arnarson, Logi
; Georg Moses, Poul
and Helveg, Stig
- publishing date
- 2017-12-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nature Communications
- volume
- 8
- issue
- 1
- article number
- 305
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:28824163
- scopus:85027705539
- ISSN
- 2041-1723
- DOI
- 10.1038/s41467-017-00385-y
- language
- English
- LU publication?
- no
- id
- 746a56b3-9870-4ae0-8415-8c1012d424a1
- date added to LUP
- 2023-12-07 09:20:00
- date last changed
- 2024-03-23 02:16:40
@article{746a56b3-9870-4ae0-8415-8c1012d424a1,
abstract = {{<p>Surface redox processes involving oxygen atom exchange are fundamental in catalytic reactions mediated by metal oxides. These processes are often difficult to uncover due to changes in the surface stoichiometry and atomic arrangement. Here we employ high-resolution transmission electron microscopy to study vanadium oxide supported on titanium dioxide, which is of relevance as a catalyst in, e.g., nitrogen oxide emission abatement for environmental protection. The observations reveal a reversible transformation of the vanadium oxide surface between an ordered and disordered state, concomitant with a reversible change in the vanadium oxidation state, when alternating between oxidizing and reducing conditions. The transformation depends on the anatase titanium dioxide surface termination and the vanadium oxide layer thickness, suggesting that the properties of vanadium oxide are sensitive to the supporting oxide. These atomic-resolution observations offer a basis for rationalizing previous reports on shape-sensitive catalytic properties.</p>}},
author = {{Ek, Martin and Ramasse, Quentin M. and Arnarson, Logi and Georg Moses, Poul and Helveg, Stig}},
issn = {{2041-1723}},
language = {{eng}},
month = {{12}},
number = {{1}},
publisher = {{Nature Publishing Group}},
series = {{Nature Communications}},
title = {{Visualizing atomic-scale redox dynamics in vanadium oxide-based catalysts}},
url = {{http://dx.doi.org/10.1038/s41467-017-00385-y}},
doi = {{10.1038/s41467-017-00385-y}},
volume = {{8}},
year = {{2017}},
}