等离激元金属/半导体光催化由于等离激元金属优异的太阳能吸收特性已经成为太阳能制氢领域的重要新兴方向。虽已取得了一些重要进展，但是其最终的太阳能到氢能的转化效率仍然很低。主要挑战有：等离激元激发产生的电荷寿命极短，电子注入效率低；电荷复合效率高，电荷分离效率低；表面催化反应速率缓慢；根据前期的结果发现等离激元光催化的基本过程均涉及界面问题，因此本项目计划以等离激元金纳米粒子/半导体为模型体系，聚焦光催化体系的界面问题，通过发展界面缺陷调控、界面助催化剂修饰等理性调控策略，考察界面结构变化对光催化分解水产氢、产氧的影响；然后结合时间、空间分辨等光谱技术定量化研究界面结构-性能关系，从而阐明界面结构在光催化过程中的微观机制。本项目研究将加深对光催化分解水基本过程的认识和理解，并为指导开发高效光催化制氢体系提供理论基础和实验依据。目前，初步的研究结果证明了该项目的可行性。

Plasmonic metal/semiconductor photocatalysis has become an important new direction in the field of solar energy hydrogen production due to its excellent solar absorption property. Although some important advances have been made, the resulting solar to hydrogen conversion efficiency is still very low. The main challenges are as follows: the lifetime of plasmon-generated electron-hole pairs is very short and the electron injection efficiency is low; the charge recombination efficiency is high and therefore the charge separation efficiency is poor. the surface catalytic reaction rate is sluggish. According to previous research, it is found that the interface issues are involved in nearly all the photocatalytic processes. For this reason, in this project, we plan to focus on the interface issues of the plasmonic photocatalysis based on gold nanoparticle/semiconductor photocatalyst as the model system. By developing rational regulation strategies such as interfacial defect regulation and interfacial co-catalyst modification, we could investigate the relationship between the interfacial structure and the performance of photocatalytic hydrogen and oxygen production. Furthermore, the critical role of interfacial structure on photocatalytic performance is quantitatively studied by combining time and space resolution spectral techniques, so as to elucidate the microscopic mechanism of interfacial structure in the photocatalytic process. The implementation of this project will deepen the understanding of the basic process of photocatalytic water splitting and provide a theoretical and experimental basis for guiding the development of high-efficiency photocatalytic hydrogen production system. At present, the preliminary research results prove the feasibility of the project.