期刊
ACS CATALYSIS
卷 12, 期 15, 页码 9570-9578出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c01959
关键词
photocatalysis; direct Z-scheme heterojunction; photogenerated electrons and holes; interfacial electric field; Density Functional Theory
资金
- China Postdoctoral Science Foundation [2022M711691]
- National Natural Science Foundation [51872145]
- Natural Science Foundation of Nanjing University of Posts and Telecommunications [NY221102]
This study investigates the formation mechanism of direct Z-scheme photocatalysts through theoretical simulations. The results indicate that the interfacial electric field can significantly promote the interlayer recombination of photogenerated electrons and holes with weak redox ability, while the weak nonadiabatic coupling of interface transfer channel plays a key role in preserving the high activity of photogenerated electrons and holes with strong redox ability. These findings deepen our understanding of Z-scheme formation and can accelerate the design of direct Z-scheme photocatalysts.
The direct Z-scheme photocatalytic heterojunction, possessing type II band alignments but simultaneously realizing the spatial separation of photogenerated electrons and holes (PEHs) and the well-preserved strong redox ability, is a promising strategy for solving energy and environmental issues. However, the conventional method of solely relying on the direction of interfacial electric field (IEF) to determine the Z-scheme is often different with experiments. Properly evaluating and constructing the direct Z-scheme remain limited. Herein, combining hybrid density functional theory and excited state ultrafast dynamics simulation, we find that the formative factor of the Z-scheme path comes from two aspects by systematically exploring a series of prototypical heterojunctions taking X2Y3 ferroelectrics (X: Al, Ga, In. Y: S, Se, Te) and BCN semiconductors. On the one hand, the interlayer recombination of PEHs with weak redox ability can be significantly promoted by the IEF. On the other hand, for PEHs with strong redox ability, the weak nonadiabatic coupling of interface transfer channel plays a key role in preserving the high activity of PEHs, which can extend the reacting time of PEHs from femtosecond to hundreds of nanosecond scale. This study deepens the understanding of Z-scheme formation and can accelerate the design of direct Z-scheme photocatalysts.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据