Journal
NANO RESEARCH
Volume 8, Issue 6, Pages 2092-2101Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0720-3
Keywords
one-dimensional heterojunction; TiO2; photocatalytic activity
Categories
Funding
- Ministry of Science and Technology of China [2011FY130104]
- National Basic Research Program of China (973 Program) [2011CB932802]
- CAS Key Laboratory for Standardization and Measurement for Nanotechnology
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Hierarchical TiO2 photocatalysts with a one-dimensional heterojunction were synthesized via a facile template-free hydrothermal method. The TiO2 photocatalysts were flower-like microspheres with a 3 mu m diameter. The base structure of the flower-like microspheres was a uniform nanowire with a 10 nm diameter. Anatase films were evenly coated onto the surface of the rutile TiO2 nanowires to form a one-dimensional core-shell base structure. This kind of one-dimensional heterojunction is conducive to the separation of charge carriers. In addition, the hierarchical TiO2 microspheres possessed a good mesoporous structure with a high specific surface area of 260 m(2)/g. Thus, the light scattering and utilization efficiency were improved in this structure. The photocatalysts exhibited better performance in both photocatalytic oxidation and reduction reactions. Moreover, the novel TiO2 photocatalysts displayed excellent stability in these reactions. This kind of hierarchical TiO2 structure has never been reported in the literature. The hierarchical structure and one-dimensional heterojunction were vital to the increase in quantum efficiency. Therefore, these hierarchical TiO2 photocatalysts have potential applications in the environmental and energy fields, such as in photocatalytic degradation, hydrogen production, Li-ion batteries, and dye-sensitized solar cells.
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