基于无序化结构构建高可见光催化活性的Z机制2D/2D异质结

设计和构建高可见光催化活性、低成本的材料体系是推动光催化走向应用的前提。如何集成宽可见光吸收、有效载流子转移和高表面反应活性是目前制约光催化材料发展的主要问题。本项目提出将无序化结构分别引入具有强还原、氧化能力的单体二维（2D）材料，构建无序化Z机制2D/2D异质结的设想，利用2D/2D异质结（充分界面接触）、Z机制（保留异质结中高氧化、还原性的载流子参与反应）的优势，结合无序化结构对可见光吸收、异质结界面键合以及表面反应活性位的有利影响，有望获得具有优异可见光催化活性的体系。选用具有可见光吸收、易合成、原料价格低廉的石墨态氮化碳纳米片和WO3纳米片作为研究模型材料，通过系统研究不同无序化状态对2D材料以及Z机制2D/2D异质结的影响，揭示无序化异质结构建的科学机制。本项目的实施将为其他材料异质结的构建提供新的研究思路和方向，对高可见光活性光催化材料的发展具有重大意义。

Designing and constructing low-cost material systems with high visible-light photocatalytic activities is the prerequisite to promote photocatalytic applications. How to integrate wide visible-light absorption, effective charge carrier transfer and high surface reactivity is the main problem that restricts the development of photocatalytic materials currently. This project proposes the idea of constructing amorphous structured Z scheme 2D/2D heterojunctions by introducing amorphous structures in two single 2D (two dimensional) materials with high reduction and oxidation abilities, respectively. Taking advantages of 2D/2D heterojunctions (sufficient interfacial contact), Z-scheme (retaining the charge carriers with higher redox abilities to participate in the reaction) and combining the beneficial effects of amorphous structures on the visible-light absorption, the interface binding and surface active sites in the heterojunctions, systems with superior visible-light photocatalytic activities are expected. Graphitic carbon nitride nanosheets and WO3 nanosheets with the advantages of visible-light absorption, easy synthesis and low cost are chosen as model materials of the project. Through systematically studying the influence of different amorphous states on the structure and photocatalytic properties of 2D materials and Z scheme 2D/2D systems, we intend to reveal the science principles in the construction of amorphous heterojunctions. The implementation of this project will provide new research ideas and directions for the construction of heterojunctions of other materials, and is of great significance for the development of highly visible-light efficient photocatalytic materials.