Facet-defined AgCl nanocrystals with surface-electronic-structure-dominated photoreactivities
Facet-defined AgCl nanocrystals with surface-electronic-structure-dominated photoreactivities
复制标题
具有表面电子结构主导光反应性的刻面定义的 AgCl 纳米晶体
DOI：
10.1016/j.nanoen.2015.11.022
复制
发表时间：
2016
期刊：
影响因子：
17.6
通讯作者：
Han Xiaodong
中科院分区：
文献类型：
--
作者：
Wang Hua;Lang Xiufeng;Hao Rui;Guo Lin;Li Jinghong;Wang Lihua;Han Xiaodong
对光催化剂刻面效应的传统理解是，暴露有高反应性刻面的半导体微/纳米晶体通常表现出优异的光催化活性。然而，这种观点在某些情况下受到了挑战。在此，成功制备了两种类型的刻面定义的AgCl纳米晶体，即暴露有六个{100}面的AgCl纳米立方体和被八个{111}面包围的AgCl八面体。其光催化性能的比较研究表明，尽管 AgCl {100} 面的理论表面能低于 AgCl {111} 面，但 AgCl 纳米立方体的光反应性高于 AgCl 八面体。进一步的机理研究表明，{111}面还原电位的大幅降低将导致光激发电子的消耗不足，从而抑制空穴参与光氧化反应。因此，表面电子结构主导AgCl {111}和{100}面的光反应性。我们的工作通过直接的实验证据揭示了AgCl {111}和{100}面的真实光反应性，所提出的机制将促进高效AgCl光催化剂的进一步开发。
The conventional understanding of facet effects on photocatalysts is that semiconductor micro/nanocrystals exposed with high-reactivity facets usually exhibit excellent photocatalytic activities. However, this point of view is being challenged in some circumstances. Herein, two types of facet-defined AgCl nanocrystals, AgCl nanocubes exposed with six {100} facets and AgCl octahedrons enclosed by eight {111} facets have been successfully prepared. The comparative studies of their photocatalytic properties reveal an unusual higher photoreactivity of AgCl nanocubes than that of AgCl octahedrons, although AgCl {100} facets have lower theoretical surface energy than the AgCl {111} facets. The further mechanism investigation suggests that the much decreased reduction potential of {111} facet would result in insufficient consumption of photo-excited electrons and hence depress the involvement of holes in photooxidation reactions. Consequently, the surface electronic structures dominate the photoreactivities of AgCl {111} and {100} facets. Our work reveals the true photoreactivities of AgCl {111} and {100} facets by direct experimental evidence, and the proposed mechanism will facilitate further development of highly efficient AgCl photocatalysts.
登录
查看更多内容
使用 ZnO 纳米线压电势增强有机染料的光催化降解
影响因子：
17.6
作者：
Xinyu Xue;Weili Zang, Ping Deng, Qi Wang, Lili Xing, Yan Zhang;Zhonglin Wang
通讯作者：
Zhonglin Wang
影响因子：
17.6
作者：
Jijie Zhang;Peng Zhang;Tuo Wang;Jinlong Gong
通讯作者：
Jijie Zhang;Peng Zhang;Tuo Wang;Jinlong Gong
影响因子：
13.3
作者：
Zhou, Weijia;Yin, Zongyou;Zhang, Hua
通讯作者：
Zhang, Hua
影响因子：
13.3
作者：
Li, Changjiang;Zhang, Peng;Gong, Jinlong
通讯作者：
Gong, Jinlong
影响因子：
19
作者：
Gong Zhang;Ziyu Hu;Meng Sun;Yang Liu;Li‐Min Liu;Huijuan Liu;C. Huang;J. Qu;Jinghong Li
通讯作者：
Gong Zhang;Ziyu Hu;Meng Sun;Yang Liu;Li‐Min Liu;Huijuan Liu;C. Huang;J. Qu;Jinghong Li