期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 13, 页码 5106-5113出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm04131a
关键词
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资金
- NSFC [50872070, 60974117, 50925205, 50990303, 50721002]
- Independent Innovation Foundation of Shandong University [2009JC011]
- Program of Introducing Talents of Discipline to Universities in China [b06015]
Nano-p-n junction heterostructure TiO2 nanobelts have been produced by assembling p-type semiconductor NiO nanoparticles on n-type TiO2 nanobelts for enhancement of the photocatalytic properties of TiO2 nanobelts. NiO/TiO2 nano-p-n junctions were synthesized on the surfaces of TiO2 nanobelts and surface-coarsened TiO2 nanobelts. The nanobelts were obtained using alkaline-and acid-assisted hydrothermal processes. The chemical-solution-deposition-decomposition process was used to form NiO nanoparticle/TiO2 heterostructure composite nanobelts (NiO-NP/TiO2 NBs), and NiO nanoparticle/surface-coarsened TiO2 heterostructure composite nanobelts (NiO-NP/TiO2 coarsened NBs). The uniform assembly of p-type NiO nanoparticles produces a large number of nano-p-n junction heterostructures on the surface of the TiO2 nanobelts, where NiO and TiO2 form p-and n-type semiconductors, respectively. Compared with both pure NiO nanoparticles and TiO2 nanobelts, NiO-NP/TiO2 NBs exhibit much enhanced photocatalytic activity. Interestingly, the optimized composite NiO-NP/TiO2 coarsened NBs exhibit an enhanced photocatalytic activity in the decomposition of a model dye compound, methyl orange (MO), under both ultraviolet and visible light irradiation. It is argued that the nano-p-n junctions effectively reduce the recombination of electrons and holes, thus leading to the enhancement of the photocatalytic properties of the heterostructure composites. The larger number of abundant photocatalytic-active surfaces in the surface-coarsened nanobelts increases photo-absorption and the production of charge carriers, which gives the composites an enhanced photocatalytic performance. The established approach allows for controlling the nano-p-n junction heterostructure of the nanobelts, and hence, their photocatalytic effect. The NiO/TiO2 nanobelt-based nano-p-n junction heterostructure TiO2 can provide a practical way to design and prepare nano-composites for applications as solar-cell electrodes, in solar photocatalysis, solar photolysis of water and other related fields.
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