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Bandgap engineering of oxygen-rich TiO2+x for photocatalyst with enhanced visible-light photocatalytic ability
Pan H.
2015-06-01
Source PublicationJournal of Materials Science
ISSN15734803 00222461
Volume50Issue:12Pages:4324-4329
Abstract

TiO, as a photocatalyst, has attracted substantial attention since the discovery of water splitting property on the TiO electrodes. However, its efficiency of water splitting is limited by its wide bandgap (~3.0 eV). Here, we predict its bandgap can be efficiently reduced by incorporating excess oxygen atoms on the basis of first-principles calculations. We show that the excess oxygen is more stable to bond to Ti atom and to form ordered structure. The narrowing of bandgap in oxygen-rich TiO originates from the ordered excess oxygen because the coupling between them shifts the conduction band bottom down. The bandgap of TiO decreases with the increase of the density of excess oxygen (x). A bandgap of 1.3 eV can be achieved at x = 0.5. The oxygen-rich TiO shows intrinsic semiconducting characteristic without localized states within the bandgap, indicating lower trapping centers. The enhancement of visible-light absorption due to the narrowed bandgap and the intrinsic semiconductor characteristic result in the improvement of the photocatalytic performance in oxygen-rich TiO.

DOI10.1007/s10853-015-8984-2
URLView the original
Indexed BySCI
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000354089200017
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Citation statistics
Cited Times [WOS]:16   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
AffiliationUniversidade de Macau
Recommended Citation
GB/T 7714
Pan H.. Bandgap engineering of oxygen-rich TiO2+x for photocatalyst with enhanced visible-light photocatalytic ability[J]. Journal of Materials Science,2015,50(12):4324-4329.
APA Pan H..(2015).Bandgap engineering of oxygen-rich TiO2+x for photocatalyst with enhanced visible-light photocatalytic ability.Journal of Materials Science,50(12),4324-4329.
MLA Pan H.."Bandgap engineering of oxygen-rich TiO2+x for photocatalyst with enhanced visible-light photocatalytic ability".Journal of Materials Science 50.12(2015):4324-4329.
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