Cationic surface polarization centers on ionic carbon nitride for efficient solar-driven H_(2)O_(2) production and pollutant abatement  

作　　者：Zhenyu Hu Zhenchun Yang Shiqi Zeng Kun Wang Lina Li Chun Hu Yubao Zhao 

机构地区：[1]MOE Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Institute of Environmental Research at Greater Bay,Guangzhou University,Guangzhou510006,China

出　　处：《Chinese Chemical Letters》2024年第10期383-388,共6页中国化学快报（英文版）

基　　金：Financial supports by the 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)are acknowledged。

摘　　要：Solar-driven H_(2)O_(2)production and emerging organic pollutants(EOPs)elimination are of great significance from the perspective of environmental sustainability.The efficiency of the photocatalytic reaction system is the key challenge to be addressed.In this work,the strategy of constructing surface ionic local polarization centers to enhance the exciton dissociation of the polymeric photocatalytic is demonstrated.Selected bipyridinium cation(TMAP)is complexed on a K^(+)-incorporated carbon nitride(CNK)framework,and the combination of local polarization centers both on the surface(bipyridinium cation)and bulk(K+cation)contributes to a superior photocatalytic H_(2)O_(2)production performance,affording a remarkable H_(2)O_(2)generation rate of 46.8μmol h^(-1)mg^(-1)and a high apparent quantum yield(AQY)value of 77.5%under irradiation of 405 nm photons.As substantiated experimentally by steady state/transient spectroscopy techniques,the surface local polarization centers increase the population of the long-lived trapped electrons,and thereby promote the interfacial charge transfer process for chemical conversion reaction.The strategy is potentially applicable to the design of a wide range of efficient solar-to-chemical conversion systems.

关 键 词：Local polarization Oxygen reductionreaction Hydrogen peroxide production Pollutantdegradation Polymeric carbon nitride 

分 类 号：TK51[动力工程及工程热物理—热能工程] X505[环境科学与工程—环境工程] TQ123.6[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]