Vectorial doping-promoting charge transfer in anatase TiO2 {001} surface
Vectorial doping-promoting charge transfer in anatase TiO2 {001} surface
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矢量掺杂促进锐钛矿型 TiO2 {001} 表面的电荷转移
DOI：
10.1016/j.apsusc.2014.05.045
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发表时间：
2014
影响因子：
6.7
通讯作者：
Cao Shaowen
中科院分区：
文献类型：
--
作者：
Zhou Peng;Wu Jionghua;Yu Weilai;Zhao Guanghui;Fang Guojia;Cao Shaowen
掺杂引起的可见光吸附通常被认为是提高TiO2光催化活性的主要原因。然而，这项工作对掺杂对TiO2光催化活性的影响有了新的认识。对C-F共掺锐钛矿型二氧化钛{0，0，1}表面的研究表明，杂质C和F原子更倾向于取代二氧化钛{0，0，1}表面最外层的氧原子，而不是块体二氧化钛中的氧原子。C和F原子在二氧化钛{0，0，1}表面的矢量掺杂形成了一层低电阻的导电层，可以促进光催化反应中的电荷转移。这有效地抑制了光生电子和空穴的不希望发生的整体复合。因此，C-F共掺杂的TiO2光催化剂表面电荷转移的优化对提高TiO2光催化活性有很大的贡献。此外，表面掺杂处理是一种潜在的提高光催化剂性能的方法。
Doping-induced visible-light adsorption is often considered as the main reason for the enhanced photocatalytic activity of TiO2. However, this work provides a new understanding on the effect of doping on the photocatalytic activity of TiO2. The investigation on the C–F codoped anatase TiO2{0 0 1} surface reveals that the impurity C and F atoms prefer to substitute for the outmost O atoms in the TiO2{0 0 1} surface rather than those in the bulk TiO2. The exhibited vectorial doping of C and F atoms in TiO2{0 0 1} surface produces a conducting layer with low electric resistance, which can promote the charge transfer in the photocatalytic reaction. This effectively inhibits the undesirable bulk recombination of photogenerated electron and hole. Hence, the optimized charge transfer in the C–F codoped TiO2{0 0 1} surface makes a great contribution to the enhanced photocatalytic activity of TiO2. Further, the surface doping treatment is a potential method to improve the performance of photocatalyst.