title: Constructing bulk defective perovskite SrTiO3nanocubes for high performance photocatalysts.
abstract: Defects (Ti3+or oxygen vacancies) have been demonstrated to promote the charge separation process in TiO2based photocatalysts. Particularly, the bulk defects within a certain concentration can give a great enhancement for both light absorption and charge separation efficiency. In this report, we explored a one-step molten salts route to synthesize SrTiO3nanocubes with bulk defects (Ti3+doped) by using SrCO3as a Sr source, and TiO2and Ti powder as Ti sources. The amount of defects can be tuned by changing the molar ratio of Ti/TiO2. The corresponding bandgap of SrTiO3can be changed from 3.29 to 2.73 eV with the increase of defects. X-ray diffraction and electron microscopy disclose that SrTiO3is highly crystalline and has a cubic morphology. X-ray photoelectron spectroscopy and electron paramagnetic resonance indicate that the as-prepared SrTiO3is close to the Ti3+doped SrTiO3. Surface photovoltage spectroscopy (SPS) and field-induced SPS confirm that Ti3+doping in the SrTiO3turns it from an n-type semiconductor to p-type. The SrTiO3with an optimal amount of defects exhibits highly enhanced photocatalytic performance. An excess amount of defects results in a weak SPS response and photocatalytic performance.
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Changchun, 130033, Jilin, P. R. China.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Beijing Key Laboratory of Green Catalysis and Separation Department of Chemistry, Chemical Engineering School of Environmental and Energy, University of Beijing Technology, Beijing, 100022, P. R. China. sunzc@bjut.edu.cn.
authors.forename: Wenshuai
authors.initials: W
authors.lastname: Jiang
authors.affiliation: Beijing Key Laboratory of Green Catalysis and Separation Department of Chemistry, Chemical Engineering School of Environmental and Energy, University of Beijing Technology, Beijing, 100022, P. R. China. sunzc@bjut.edu.cn.
authors.forename: Shixin
authors.initials: S
authors.lastname: Hua
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Changchun, 130033, Jilin, P. R. China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Changchun, 130033, Jilin, P. R. China.
authors.forename: Ligong
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Beijing Key Laboratory of Green Catalysis and Separation Department of Chemistry, Chemical Engineering School of Environmental and Energy, University of Beijing Technology, Beijing, 100022, P. R. China. sunzc@bjut.edu.cn.
authors.forename: Zaicheng
authors.initials: Z
authors.lastname: Sun