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Reactivity at the oxygen/titania interface and the related charge transfer

Reactivity at the oxygen/titania interface and the related charge transfer The present paper reports the reactivity between TiO2 and oxygen and the related charge transfer at 298 and 1,073 K. The studies were performed using work function measurements. It was found that oxidation of TiO2 at 1,073 K and p(O2) = 75 kPa, initially standardized at 1,173 K and p(O2) = 10 Pa, results in work function changes that are consistent with the theoretical model of the charge transfer during oxygen chemisorption and oxygen incorporation at the absence of structural transitions. However, oxidation of TiO2 at 298 K, p(O2) = 75 kPa, which has been initially standardized at 1,173 K in extremely reducing conditions at p(O2) = ∼10−10 Pa, results in work function changes that are consistent with low-dimensional structural changes of the surface layer. It is shown that oxidation of strongly reduced TiO2 at 298 K results in a decrease of work function, which cannot be explained without assuming the structural changes of the outermost surface layer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Reactivity at the oxygen/titania interface and the related charge transfer

Bak, T.; Nowotny, J.; Nowotny, M.; Sheppard, L.
Ionics , Volume 12 (5) – Oct 11, 2006
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References (12)

Publisher
Springer Journals
Copyright
Copyright © 2006 by Springer-Verlag
Subject
Chemistry; Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-006-0044-0
Publisher site
See Article on Publisher Site

Abstract

The present paper reports the reactivity between TiO2 and oxygen and the related charge transfer at 298 and 1,073 K. The studies were performed using work function measurements. It was found that oxidation of TiO2 at 1,073 K and p(O2) = 75 kPa, initially standardized at 1,173 K and p(O2) = 10 Pa, results in work function changes that are consistent with the theoretical model of the charge transfer during oxygen chemisorption and oxygen incorporation at the absence of structural transitions. However, oxidation of TiO2 at 298 K, p(O2) = 75 kPa, which has been initially standardized at 1,173 K in extremely reducing conditions at p(O2) = ∼10−10 Pa, results in work function changes that are consistent with low-dimensional structural changes of the surface layer. It is shown that oxidation of strongly reduced TiO2 at 298 K results in a decrease of work function, which cannot be explained without assuming the structural changes of the outermost surface layer.

Journal

Ionics – Springer Journals

Published: Oct 11, 2006

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