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Photocatalytic properties of TiO2: Effect of niobium and oxygen activity on partial water oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
44734 46344 2016 11 PDF Available
Title
Photocatalytic properties of TiO2: Effect of niobium and oxygen activity on partial water oxidation
Abstract

•Photocatalytic properties are determined by structural defects.•Photoreactivity of water with TiO2 is determined by the concentration of titanium vacancies.•Titanium vacancies are the surface active sites responsible for water oxidation.

This work reports the effect of niobium (0–1 at%) on photocatalytic activity and the band gap of TiO2 with controlled oxygen activity in the range 10−12 Pa < p(O2) < 105 Pa. It is shown that maximum of photocatalytic performance in partial water oxidation is observed for Nb-doped TiO2 containing 1 at% Nb that is processed at 1273 K in pure oxygen, p(O2) = 105 Pa. The mechanism of photocatalytic water oxidation is considered in terms of a predominant effect of photocatalytically active surface sites corresponding to titanium vacancies. It is shown that the niobium-induced increase of the band gap, surface potential and charge transport have a minor influence on photoreactivity of Nb-doped TiO2 with water.

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Keywords
Solar energy; Defect chemistry; Oxide semiconductors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 198, 5 December 2016, Pages 243–253
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us