In-situ study of the hydrogen peroxide photoproduction in seawater on carbon dot-based metal-free catalyst under operation condition  

作　　者：Jiaxuan Wang Jiacheng Li Zenan Li Jie Wu Honglin Si Yangbo Wu Zhiyong Guo Xuepeng Wang Fan Liao Hui Huang Mingwang Shao Yang Liu Zhenhui Kang 

机构地区：[1]Institute of Functional Nano and Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices,Soochow University,Suzhou 215123,China [2]Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China [3]State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products,School of Material Science and Chemical Engineering,Ningbo University,Ningbo 315211,China [4]Macao Institute of Materials Science and Engineering(MIMSE),MUST-SUDA Joint Research Center for Advanced Functional Materials,Macao University of Science and Technology,Taipa 999078,Macao,China

出　　处：《Nano Research》2024年第7期5956-5964,共9页纳米研究（英文版）

基　　金：supported by Natural Science Foundation of Jiangsu Province(No.BK20220028);the National Key Research and Development Program of China(Nos.2020YFA0406104 and 2020YFA0406101);the National Natural Science Foundation of China(Nos.52272043,52271223,52202107,and 52201269);Natural Science Foundation of Jiangsu Province(Nos.BK20210735 and 21KJB430043);the Science and Technology Development Fund,Macao SAR(No.0009/2022/ITP);Shenzhen Science and Technology Plan Project(Collaborative Innovation Special Project,SGDX20220530111203019);Collaborative Innovation Center of Suzhou Nano Science and Technology;the 111 Project;Suzhou Key Laboratory of Functional Nano and Soft Materials.

摘　　要：Hydrogen peroxide(H_(2)O_(2))photoproduction in seawater with metal-free photocatalysts derived from biomass materials is a green,sustainable,and ultra environmentally friendly way.However,most photocatalysts are always corroded or poisoned in seawater,resulting in a significantly reduced catalytic performance.Here,we report the metal-free photocatalysts(RUT-1 to RUT-5)with in-situ generated carbon dots(CDs)from biomass materials(Rutin)by a simple microwave-assisted pyrolysis method.Under visible light(λ≥420 nm,81.6 mW/cm^(2)),the optimized catalyst of RUT-4 is stable and can achieve a high H_(2)O_(2)yield of 330.36μmol/L in seawater,1.78 times higher than that in normal water.New transient potential scanning(TPS)tests are developed and operated to in-situ study the H_(2)O_(2)photoproduction of RUT-4 under operation condition.RUT-4 has strong oxygen(O_(2))absorption capacity,and the O_(2)reduction rate in seawater is higher than that in water.Metal cations in seawater further promote the photo-charge separation and facilitate the photo-reduction reaction.For RUT-4,the conduction band level under operating conditions only satisfies the requirement of O_(2)reduction but not for hydrogen(H2)evolution.This work provides new insights for the in-situ study of photocatalyst under operation condition,and gives a green and sustainable path for the H_(2)O_(2)photoproduction with metal-free catalysts in seawater.

关 键 词：carbon dots hydrogen peroxide photocatalysis transient potential scanning in-situ study operation condition 

分 类 号：O64[理学—物理化学]