MoS2/金属-有机框架材料（MOFs）/g-C3N4纳米复合结构的构建、形成机制及光催化性能研究

石墨相氮化碳（g-C3N4）具有适宜的能带结构，性质稳定，成本低，在光催化产氢方面极具应用前景。但其比表面积小、可见光吸收能力低、光生载流子复合率高等问题限制了应用。本课题以MoS2/金属-有机框架材料（MOFs）/g-C3N4纳米复合结构的构建及其光催化性能为研究目标，在能带调控及性能优化后的层状g-C3N4表面负载比表面积大且具载流子传输能力的MOFs和光吸收性能好且电子捕获能力强的助催化剂MoS2，以获得高催化活性的纳米复合结构。研究g-C3N4形态、能带结构及表面状态的调控机制及优化方法，探讨MoS2及MOFs在g-C3N4表面沉积的关键因素及调控机理，探明纳米复合结构内部的界面特性、各组元/纳米复合结构与光子及水分子的相互作用，研究复合结构表面/内部载流子的产生、输运及利用机理。该结果有望获得高效稳定低成本的光解水产氢材料，为新型高效光解水产氢系统的开发提供理论指导和技术途经。

Polymeric graphitic carbon nitride (g-C3N4) shows broad and important application in photocatalytic hydrogen evolution due to its appropriate band structure, stable properties and low cost, but its applications are restricted by its relatively small specific surface area, low visible light absorption and high photo-generated carriers recombination to some extent. The main research objective of this propose is to fabricate MoS2/metal-organic framework(MOFs)/g-C3N4 nano-composite structure and study their photocatalytic performance. The nano-layered g-C3N4 after band structure control and performance optimization is used as photocatalytic active materials, and then MOFs with high specific surface area and good photo-generated carriers transport ability as well as MoS2 as photocatalytic promoter are both deposited on the g-C3N4 nanolayers to form the MoS2/MOFs/g-C3N4 nano-composite structure. The control mechanism and optimization methods of the morphology, band structure and surface state of the g-C3N4 as well as the key factors and formation mechanism of the MoS2 and MOFs on the nano-layered g-C3N4 will be systematically studied. The interfacial characteristics of the nano-composite structure and the interaction between every component, water and photons in the nano-composite structure will be researched. At the same time, the generation, transportation and utilization process of the charge carriers on the surface and inside of the MoS2/MOFs/g-C3N4 nano-composite structure will also evaluated. During the research process, a high efficient, stable and low-cost photocatalytic materials for hydrogen evolution will be fabricated, and the obtained research results will provide theoretical direction and technological approach for the new style water splitting system with high conversion efficiency.