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Effects of Potassium Chemisorption on the Electronic Structure of VxOy/TiO2 Surfaces

Published online by Cambridge University Press:  10 February 2011

Fulvio Parmigiani ,
Laura E. Depero  and
Luigi Sangaletti
Fulvio Parmigiani
Affiliation:
Istituto Nazionale di Fisica per la Materia and Politecnico di Milano, Dipartimento di Fisica, Piazza leonardo da Vinci, 32 – 20133 Milano, ITALY
Laura E. Depero
Affiliation:
Istituto Nazionale di Fisica per la Materia and Università di Brescia, Dipartimento di Chimica e Fisica per i Materiali, Via Branze, 38 – 25123 Brescia, ITALY
Luigi Sangaletti
Affiliation:
Istituto Nazionale di Fisica per la Materia and Università di Brescia, Dipartimento di Chimica e Fisica per i Materiali, Via Branze, 38 – 25123 Brescia, ITALY
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Abstract

X-ray photoelectron spectroscopy of pure and K chemisorbed VxOy/TiO2 powders are reported. Core-line and valence band spectra suggest the presence of vanadium open shell ions on the pure VxOy/TiO2 interface, whereas potassium vanadate seems to form after K chemisorption. That results in the presence of a significant amount of gap states, with vanadium character, just above the O2p band edge, for the pure VxOy/TiO2 powder, while K chemisorption, reducing significantly the open shell vanadium ions, quenches the gap emission in the XPS valence band spectra.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 454: Symposium S – Advanced Catalytic Materials–1996 , 1996 , 97
Copyright
Copyright © Materials Research Society 1997

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