期刊
ADVANCED ENERGY MATERIALS
卷 4, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201300995
关键词
TiO2; BiVO4 nanocomposites; high-energy electron transfer; photogenerated charges; lifetimes; photocatalysis; water splitting
类别
资金
- NSFC [21071048]
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- Research Project of Chinese Ministry of Education [213011A]
- Specialized Research Fund for the Doctoral Program of Higher Education [20122301110002]
- Chang Jiang Scholar Candidates Programme for Heilongjiang Universities [2012CJHB003]
Different mole ratios of TiO2/BiVO4 nanocomposites with effective contacts have are fabricated by putting BiVO4 nanoparticles into the TiO2 sol, followed by thermal treatment at 450 degrees C. Based on the transient-state surface photovoltage responses and the atmosphere-controlled steady-state surface photovoltage spectra, it is concluded that the photogenerated charge carriers in the TiO2/BiVO4 nanocomposite with a proper mole ratio (5%) display much longer lifetime and higher separation than those in the BiVO4 alone. This is responsible for the unexpected activity for photoelectrochemical oxidation of water, for photocatalytic production of H-2, and for photocatalytic degradation of phenol as a model pollutant under visible irradiation. Moreover, it is suggested that the prolonged lifetime and increased separation of photogenerated charges in the fabricated TiO2/BiVO4 nanocomposite is attributed to the unusual spatial transfer of visible-excited high-energy electrons of BiVO4 to TiO2. This work will provide feasible routes to synthesize visible-light responsive nanomaterials for efficient solar utilization.
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