期刊
JOURNAL OF POWER SOURCES
卷 285, 期 -, 页码 449-459出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.03.070
关键词
Ti3+ self-doped; Hybrid oxides; Heterojunction; Hydrogen production; Visible light photocatalyst
资金
- Key Project of Natural Science Foundation of Shandong Province [ZR2013EMZ001]
- National Basic Research Program of China [2013CB632401]
- National Nature Science Foundation of China [51402145]
- Project of Shandong Province Higher Educational Science and Technology Program [J12LA01]
- Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province
- U.S. Department of Energy [DE-AC0206CH11357]
- Vehicle Technologies Office, Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE)
Ti3+ self-doped titanium-zinc hybrid oxides with different phase compositions and morphologies were successfully synthesized using Zn powder as the reductant and Zn source by a chemical-reduction precipitation method with subsequent thermal treatment. The fabricated Ti3+ self-doped TiO2(A)/TiO2(R), TiO2(A)/TiO2(R)/ZnTiO3, and TiO2(A)/ZnO heterojunctions were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The effects of various Ti/Zn molar ratios and preparation processes on the structural, morphological, optical, photocurrent and photocatalytic properties of the resultant samples were investigated systematically. Results reveal that Ti3+ self-doping enhances the photoabsorption capability of titanium-zinc hybrid oxides in the visible-light region. Moreover, different processes and Ti/Zn molar ratios play great influences on the structure, morphology, optical, photocurrent and photocatalytic properties of the final products. Ti3+ self-doped titanium-zinc hybrid oxides exhibit excellent photocurrent and photocatalytic activity than pure TiO2 and ZnTiO3 under visible-light irradiation (lambda >= 400 nm). The most active Ti3+ self-doped titanium-zinc hybrid oxides photoanode presents significantly improved water splitting performance. The synergistic effect between the Ti3+ self-doped and heterojunctions is responsible for the enhanced performance of these materials. Published by Elsevier B.V.
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