2D-硫化铼/2D-二氧化钛异质结的结构设计、界面调控及其光催化性能研究

项目以构建高效稳定的光解水制氢系统为目标，以光化学性质稳定、光吸收能力强、比表面积大、载流子传输能力强的二维二氧化钛（2D-TiO2）纳米片为主光催化材料，在结构优化及缺陷改性基础上，负载新型二维TMDCs—ReS2，构建由2D-TiO2作为光捕获剂，由2D-ReS2作为助催化剂的新型2D/2D异质结光催化材料。探讨2D-TiO2表面负载2D-ReS2以形成不同结构和界面特性2D/2D异质结的调控方法，探明异质结结合形式及界面特性对电子快速传输的作用，明确不同结构2D/2D异质结对光催化体系载流子分离、迁移及光催化产氢反应的促进作用；最后找到2D/2D异质结与光催化制氢效率、稳定性的相互关系。此类基于2D/2D异质结的光催化产氢系统可最大限度实现对太阳光中可见及近红外光的利用，有效促进体系中载流子的分离和迁移，进而提高2D材料表面双电子催化产氢反应速率，可望最大限度提升光催化分解产氢效

Aim for the water splitting system with highly efficient and stable characteristics, the two-dimensional TiO2 nanosheets (2D-TiO2) are chosen as main photocatalytic materials because of their stable photochemical property, high light absorption ability, large specific surface area and good carrier transport ability. Based on defect modification of 2D-TiO2, a novel 2D TMDCs—ReS2 with unique physical and chemical properties will be loaded on the surface of 2D-TiO2 nanosheets, and then a functional 2D-ReS2/2D-TiO2 heterojunction photocatalyst with different structure will be designed and synthesized by using 2D anatase TiO2 nanosheets with exposed (001) facets as the light-harvesting semiconductor and 2D layered ReS2 as the cocatalyst for solar H2 generation. The regulation and control method of the 2D/2D heterojunction with different combination mode and interface characteristics will be studied. The role of combination mode and interface structure of the 2D/2D heterojunction on the fast transmission of electrons as well as the photocatalytic hydrogen production will be deeply analyzed. The relationship between the efficiency as well as stability of photocatalytic hydrogen production and 2D/2D heterojunction is also clarified in this project. It is easily expected that the photocatalyst system based on the 2D-ReS2/2D-TiO2 heterojunction can achieve the maximum utilization of the sun light in the visible and near infrared light region, and it is easy for 2D/2D heterojunction to control carrier flow and separation, and then improve two-electron catalytic reaction occurring on the surface of the two 2D materials. It is very important for the solar photocatalyst system to reach the maximum hydrogen production efficiency.