Atomic-scale view of redox-induced reversible changes to a metal-oxide catalytic surface: VOx/α-Fe2O3(0001)

Chang Yong Kim; Anthony A. Escuadro; Peter C. Stair; Michael J. Bedzyk

doi:10.1021/jp067862s

Atomic-scale view of redox-induced reversible changes to a metal-oxide catalytic surface: VO_x/α-Fe₂O₃(0001)

Chang Yong Kim, Anthony A. Escuadro, Peter C. Stair, Michael J. Bedzyk^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

X-ray standing wave (XSW) analysis and X-ray photoelectron spectroscopy are used to trace the electronic and atomic-scale structural changes of a supported vanadium oxide system at different stages of its oxidation-reduction cycle. Both the oxidation state and adsorption geometry of the vanadium oxide and its α-Fe₂O₂(0001) single crystal support show reversible changes through the oxidation-reduction cycle characteristic of catalytic behavior. The 3D V atomic distribution maps, derived from the summation of the XSW measured Fourier components, reveal that the V undergoes adsorption site exchange during the oxidation and reduction cycle.

Original language	English (US)
Pages (from-to)	1874-1877
Number of pages	4
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	5
DOIs	https://doi.org/10.1021/jp067862s
State	Published - Feb 8 2007

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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abstract = "X-ray standing wave (XSW) analysis and X-ray photoelectron spectroscopy are used to trace the electronic and atomic-scale structural changes of a supported vanadium oxide system at different stages of its oxidation-reduction cycle. Both the oxidation state and adsorption geometry of the vanadium oxide and its α-Fe2O2(0001) single crystal support show reversible changes through the oxidation-reduction cycle characteristic of catalytic behavior. The 3D V atomic distribution maps, derived from the summation of the XSW measured Fourier components, reveal that the V undergoes adsorption site exchange during the oxidation and reduction cycle.",

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AB - X-ray standing wave (XSW) analysis and X-ray photoelectron spectroscopy are used to trace the electronic and atomic-scale structural changes of a supported vanadium oxide system at different stages of its oxidation-reduction cycle. Both the oxidation state and adsorption geometry of the vanadium oxide and its α-Fe2O2(0001) single crystal support show reversible changes through the oxidation-reduction cycle characteristic of catalytic behavior. The 3D V atomic distribution maps, derived from the summation of the XSW measured Fourier components, reveal that the V undergoes adsorption site exchange during the oxidation and reduction cycle.

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