近年来，贵金属内核@半导体外壳的核壳纳米材料，以独特的微观结构和催化特性，成为光催化领域的研究热点。在前期探索性研究中，申请人首次合成了二元合金内核的AuPd@TiO2、PtCo@CdS核壳光催化材料，发现其具有高的光解水产氢活性和催化稳定性。在此基础上，本项目拟深入研究二元合金@半导体核壳光催化材料的分解水活性及机理：首先，通过形貌调控合成不同结构的二元合金纳米晶，研究二元合金的表面结构、SPR效应等性质，揭示合金元素的“协同作用”微观机制；进一步研究二元合金与半导体“三维”界面的物理化学性质，实现光生载流子在界面处的高效分离，阐明载流子迁移机制和反应途径；再次，基于二元合金内核的形貌，控制合成多种结构的核壳材料，研究二元合金形貌对核壳材料光催化性能的影响规律；最终揭示二元合金纳米晶内核对核壳光催化材料性能的影响机制，通过对实验规律深入研究和总结，为高效光催化体系开发提供理论及实验依据。

In recent years, the novel core-shell nanomaterials with noble metal core@semiconductor shell structures have become the hot issue in the field of photocatalysis, due to their unique chemical structures and catalytic performance. In the previous exploring research, we have successfully synthesized the novel AuPd@TiO2 and PtCo@CdS core-shell photocatalytic materials with bimetallic cores, and found that the novel core-shell catalysts showed high hydrogen evolution activity via photocatalytic water splitting and catalytic stability. Based on the prior experimental results, the present proposal will investigate the water splitting performance and catalytic mechanisms of bimetallic alloy@semiconductor core-shell photocatalytic materials: first, we will synthesis bimetallic alloy nanocrystals with different structures via morphology control techniques, and investigate the surface structures and SPR effects of the bimetallic alloy cores, and reveal the “synergistic effect” micro mechanism of the metal elements. Next, we will analyze the physical chemistry properties of the "three-dimensional" interfaces between bimetallic alloy cores and photocatalysts, and achieve the efficient separation of photogenerated electrons and holes in the interfaces, and reveal the transfer mechanism and reacting path ways of photo-generated charge carriers. Thirdly, we will control the synthesis of core-shell photocatalytic materials with different component and structures based on the morphology of bimetallic alloy cores, and explore the effect mechanism of the bimetallic alloy cores morphology on the performance of core-shell materials. Finally, we will in-depth investigate and summary the experimental rules to reveal the influence mechanism of bimetallic alloy nanocrystal cores on the performance of core-shell photocatalytic materials, and provide the theoretical and experimental basis for the development of efficient photocatalytic systems.