氮化碳共轭π体系的精确调控及其CO2光还原协同有机光合成研究

针对氮化碳的光吸收、电荷分离迁移、表面反应及电子和空穴的综合利用等关键科学问题，本项目拟设计合成可见-近红外响应的分子钴/氮化碳光催化剂，精确调控其共轭π体系，进而调控其能带结构，并将其应用于二氧化碳光还原协同有机光合成应用中。（1）通过超分子自组装构建分子组合体，获得特殊形貌结构的氮化碳；（2）通过引入不同给电子和吸电子能力的有机官能团以及可控氢还原等技术调控其共轭π体系进而精确调控其能带结构，从而拓展其光谱响应范围；（3）通过分子钴等助催化剂的表面修饰加速电荷分离迁移，增强表面化学反应；（4）通过二氧化碳光还原与有机光合成协同催化，增强电子和空穴的综合利用率，提升体系整体光催化性能。本项目有助于揭示共轭π体系的调控及分子钴的表面修饰对能带结构和光电荷分离传输特性的影响，指导设计高效的光催化剂，将对氮化碳在二氧化碳光还原协同有机光合成应用方面提供重要思路。

In response to the key scientific issues: light absorption, charge separation, surface photocatalytic reaction and comprehensive utilization of electrons and holes, we present the following strategies. (1) Constructing a molecular assembly by supramolecular pre-assembly to obtain carbon nitride with special morphology; (2) Regulating the conjugated π system and then precisely regulating the electronic band structure, which could expand the spectral response range, accelerate charge separation and migration, and enhance surface chemical reactions; (3) Accelerating the charge separation and migration and enhancing the surface chemical reaction by the surface modification of molecular cobalt; (4) Enhancing the photocatalytic performance of the whole system through the synergistic catalysis of CO2 photoreduction and organic photosynthesis. This project will help to reveal the effects on electronic band structure and charge separation and transport properties through the regulation of conjugated π system and surface modification of molecular cobalt, and to guide the design of efficient photocatalysts. It will also provide an important theoretical basis for the synergistic catalysis of CO2 photoreduction and organic photosynthesis.