Extended light absorption and accelerated charge migration in ultrathin twisted carbon nitride nanoplates for efficient solar hydrogen production  

作　　者：Yanmin Zou Shiyao Li Dandan Zheng Jianyong Feng Sibo Wang Yidong Hou Guigang Zhang 

机构地区：[1]State Key Laboratory of Photocatalysis on Energy and Environment,College of Chemistry,Fuzhou University,Fuzhou 350108,China [2]College of Environment and Safety Engineering,Fuzhou University,Fuzhou 350108,China [3]Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China

出　　处：《Science China Chemistry》2024年第7期2215-2223,共9页中国科学（化学英文版）

基　　金：financially supported by the National Key R&D Program of China(2021YFA1502100);the National Natural Science Foundation of China(22032002,22172029,22311540011,22202045,22002016,and U1905214);the 111 Project(D16008)。

摘　　要：Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water splitting.However,pristine carbon nitride prepared by traditional solid-state polymerization usually encounters issues such as rapid carrier recombination and insufficient absorption of visible light below 460 nm.Herein,poly(heptazine imide)with a distinctive nanoplate structure was synthesized in a binary molten salt of NaCl–CaCl_(2).The salt template allows the formation of the thin nanoplate structure,which promotes the charge separation and migration.Besides,the intercalation of Ca^(2+)ions between the conjugated layers endows the activation of n–π*electron transition due to the distortion of in-plane heptazine layers.Accordingly,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from water.This work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide).

关 键 词：photocatalysis poly heptazine imide NANOPLATES ion intercalation hydrogen production 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]