Molecular engineering towards dual surface local polarization sites on poly(heptazine imide)framework for boosting H_(2)O_(2) photo-production  

作　　者：Zhenchun Yang Bixiao Guo Zhenyu Hu Kun Wang Jiahao Cui Lina Li Chun Hu Yubao Zhao 

机构地区：[1]Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Institute of Environmental Research at Greater Bay,Guangzhou University,Guangzhou 510006,China [2]Department of Environmental Science and Engineering,Guangzhou University,Guangzhou 510006,China

出　　处：《Chinese Chemical Letters》2024年第8期396-400,共5页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.21976041);Guangzhou Municipal Science and Technology Project(No.202201020168);Tertiary Education Scientific Research Project of Guangzhou Municipal Education Bureau(No.202235238);Guangdong Basic and Applied Basic Research Foundation(No.2023A1515010788).

摘　　要：The selective 2e^(−)ORR reaction on polymeric carbon nitride framework is one of the most promising approaches for solar-driven hydrogen peroxide production.Poly(heptazine imide)(PHI)as a class of K+-incorporated crystalline carbon nitride framework,is highly active for photocatalytic H_(2)O_(2)production.An upgrade on the H_(2)O_(2)photoproduction performance of PHI is realized and the mechanistic insights are revealed in this work.By photochemical reaction,the electron withdrawing groups of hydroxyl group and cyano group are grafted on the surface of PHI frameworks.The dual polarization sites on the sur-face contribute significantly to the enhancement of the exciton dissociation.The optimized PHI with dual polarization sites exhibits a remarkable photocatalytic H_(2)O_(2)production performance,which is 2times of the active pristine PHI.Most importantly,the photochemical reaction method is generally applicable to improve the exciton dissociation of a wide range of polymeric carbon nitride frameworks with vari-ous structure and compositions;and the thiourea-derived polymeric carbon nitride framework with dual surface polarization sites exhibits a remarkable photocatalytic performance with a high H_(2)O_(2)production rate of 40.5 mmol h^(−1)g^(−1).

关 键 词：PHOTOCATALYSIS Hydrogen peroxide production Carbon nitride framework Surface functionalization ORR 

分 类 号：TQ123.6[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]