光催化分解水系统通常由捕光材料和助催化剂组成。因捕光材料中电荷输运距离长、与助催化剂之间的界面作用弱，导致光生电荷难以高效分离，是制约光解水性能的本质因素。基于电荷分离特性分析，捕光材料多孔化可引入均相分布的活性位，缩短电荷输运距离；同时，原位生长的助催化剂可与捕光材料形成强作用界面，促进电荷界面转移，最终实现电荷的高效分离。基于此，结合石墨相氮化碳存在弱氢键、强碳-氮键及较低热稳定性的特点，申请人拟通过可控热处理破坏氢键来制备多孔氮化碳，并利用热处理过程中因氮化碳部分分解释放的活性含氮物种，在其表面原位生长高活性金属氮化物助催化剂，实现具有强界面作用的多孔氮化碳捕光材料-金属氮化物助催化剂的一体化构筑。本项目旨在建立具有强界面作用的多孔捕光材料-助催化剂一体化构筑的一般性方法，揭示界面结构促进界面电荷分离的作用机制，为发展高性能氮化碳基光解水材料提供科学依据和实验指导。

Photocatalysts are usually composed of the light-absorber and the cocatalyst. Because of the long charge transport in the light absorber and the weak interaction at the light absorber/cocatalyst interface, the photogenerated carriers cannot be efficiently separated in photocatalysts, suppressing the photocatalytic water splitting performance. Based on the analysis of the charge separation characteristics, a porous light-absorber can produce homogeneous active sites, shorten the charge transportation distance. In-situ growth of cocatalysts at surface active sites can form interfaces with strong interactions, promoting the charge transfer across interfaces. Thus, in-situ growth of cocatalysts on porous light absorber materials is a promising strategy to produce photocatalysts with high charge separation efficiency. Based on the characteristics of the weak hydrogen bond, strong C-N bond and low thermal stability of graphitic carbon nitride, active nitrogen species could be yielded by the partial decomposition of carbon nitride during selectively breaking hydrogen bond to form the porous structure, which can in-situ convert the metal precursor into the corresponding metal nitride. Therefore, metal nitride cocatalysts could be in situ anchored on the surface active sites of porous carbon nitride during one-step thermal treatment. This project aims to establish a general method for the integration of the porous carbon nitride and cocatalysts with strong interface interaction, revealing the interaction mechanism of interface structure on promoting the charge carrier separation across interfaces and providing scientific basis and experimental guidance for the development of high-performance carbon nitride based photocatalysts.