摘要
有一个维的异质接面的层次 TiO <sub>2</sub> 光催化剂经由一个灵巧的没有模板的热水的方法被综合。TiO <sub>2</sub> 光催化剂是有 3 m 直径的象花的 microspheres。象花的 microspheres 的基础结构是有 10 nm 直径的一致 nanowire。锐钛矿电影是均匀地涂的到金红石 TiO <sub>2</sub> nanowires 的表面上形成一个维的核心壳底结构。这种一个维的异质接面对费用搬运人的分离导致。另外，层次 TiO <sub>2</sub> microspheres 与 260 m <sup>2</sup>/g 的一个高特定的表面区域拥有了好 mesoporous 结构。因此，散布的光和利用效率在这结构被改进。光催化剂在 photocatalytic 氧化和减小反应展出了更好的性能。而且，新奇 TiO <sub>2</sub> 光催化剂在这些反应显示了优秀稳定性。这种层次 TiO <sub>2</sub> 结构从来没在文学被报导过。层次结构和一个维的异质接面对量效率的增加重要。因此，这些层次 TiO <sub>2</sub> 光催化剂有潜在的应用程序在环境并且精力域，例如在 photocatalytic 降级，氢生产， Li 离子电池，和敏化染料的太阳能电池。
Hierarchical TiO2 photocatalysts with a one-dimensional heterojunction were synthesized via a facile template-free hydrothermal method. The TiO2 photo- catalysts were flower-like microspheres with a 3 μm 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 m2/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.
