Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 138, Issue -, Pages 26-32Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2013.02.011
Keywords
Photocatalysis; Vacuum Deoxidation; ZnO; Surface oxygen vacancy
Funding
- National Natural Science Foundation of China [20925725, 50972070, 51102150]
- National Basic Research Program of China [2013CB632403]
- National High Technology Research and Development Program of China [2012AA062701]
- Ministry of Science and Technology of China [2009IM030500]
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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. (C) 2013 Elsevier B.V. All rights reserved.
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