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Issue 15, 2021
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Probing surface-sensitive redox properties of VOx/TiO2 catalyst nanoparticles

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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 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.

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

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Article information


Submitted
18 Dec 2020
Accepted
26 Mar 2021
First published
07 Apr 2021

Nanoscale, 2021,13, 7266-7272
Article type
Paper

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

M. Ek, L. Arnarson, P. Georg Moses, S. B. Rasmussen, M. Skoglundh, E. Olsson and S. Helveg, Nanoscale, 2021, 13, 7266
DOI: 10.1039/D0NR08943E

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