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Production of visible activity and UV performance enhancement of ZnO photocatalyst via vacuum deoxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
46204 46435 2013 7 PDF Available
Title
Production of visible activity and UV performance enhancement of ZnO photocatalyst via vacuum deoxidation
Abstract

ZnO photocatalyst with surface oxygen vacancies was obtained via vacuum deoxidation method. The concentration of surface oxygen vacancies could be controlled by tuning the temperature and time in vacuum, which governs the production of visible activity and the enhanced level of photocatalytic activity. The optimum UV photocatalytic activity and photocurrent of vacuum ZnO are almost 1.7 and 2.4 times as high as that of pure ZnO, respectively. Interestingly, the dramatic visible photocatalytic activity and distinct photocurrent both are generated due to the introducing of oxygen vacancies on ZnO surface. The enhancement in performance is attributed to the high separation efficiency of photogeneration electron–hole pairs due to the broadening of the valance band (VB) induced by surface oxygen-vacancies states. The production of visible photoactivity is demonstrated to be the narrow of energy band gap resulting from the rising of VB.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► ZnO with visible activity and high UV activity was fabricated via vacuum deoxidation. ► The performance is regarded due to the introduction of surface oxygen vacancies. ► The concentration of surface oxygen vacancies could be controlled by tuning the temperature and time in vacuum. ► The enhancement in performance is due to the broadening of the valance band. ► The production of visible activity results from the narrow of energy band gap.

Keywords
Photocatalysis; Vacuum Deoxidation; ZnO; Surface oxygen vacancy
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Production of visible activity and UV performance enhancement of ZnO photocatalyst via vacuum deoxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 138–139, 17 July 2013, Pages 26–32
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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