Molecular Engineering of g-C_(3)N_(4)with Dibenzothiophene Groups as Electron Donor for Enhanced Photocatalytic H_(2)-Production  

作　　者：Shanren Tao Sijie Wan Qinyang Huang Chengming Li Jiaguo Yu Shaowen Cao 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Chinese Journal of Structural Chemistry》2022年第6期48-54,共7页结构化学（英文）

基　　金：financially supported by the National Natural Science Foundation of China(51922081,51961135303,51932007,and U1705251);National Innovation and Entrepreneurship Training Program for College Students(S202110497007)。

摘　　要：The construction of donor-acceptor(D-A)molecular structure is an attractive strategy to enhance the photocatalytic performance of polymeric semiconductors.Herein,dibenzothiophene(DBT)-4-carbaldehyde as the precursor is introduced into g-C_(3)N_(4)(TCN)prepared by two-step thermal polymerization to construct an intramolecular D-A type copolymer(TCN-DBT_(x)).DFT calculation and experimental results reveal that DBT plays the role of electron donor unit to modify g-C_(3)N_(4).The incorporation of DBT not only adjusts the band gap to improve reduction ability,but also induces an internal electric field with extendingπ-conjugated system for effective charge transfer.As a result,TCN-DBT_(x)exhibits much better photocatalytic performance with an optimal hydrogen production rate of 3334μmol h^(-1)g^(-1),which is 2.5 times that of TCN.This work provides a protocol for preparing high-performance g-C_(3)N_(4)-based photocatalysts toward various applications.

关 键 词：carbon nitride DONOR-ACCEPTOR PHOTOCATALYSIS charge transfer 

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]