Design and in-situ construct BiOI/Bi/TiO_(2)photocatalysts with metal-mediated heterostructures employing oxygen vacancies in TiO_(2)nanosheets

作     者：Chenchen Zhang Wenbin Chen Dairong Hu Hanjie Xie Yibing Song Binbin Luo Yiwen Fang Wenhua Gao Ziyi Zhong Chenchen Zhang;Wenbin Chen;Dairong Hu;Hanjie Xie;Yibing Song;Binbin Luo;Yiwen Fang;Wenhua Gao;Ziyi Zhong

作者机构：Department of ChemistryShantou UniversityGuangdong515063China Department of Chemical EngineeringGuangdong Technion-Israel Institute of Technology(GTIIT)Guangdong515063China Technion-Israel Institute of Technology(IIT)Haifa32000Israel 

出 版 物：《Green Energy & Environment》 (绿色能源与环境（英文版）)

年 卷 期：2022年第7卷第4期

页      面：680-690页

核心收录：

学科分类：081704[工学-应用化学] 081705[工学-工业催化] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.21043006 and 51702205) the Education Department of Guangdong Province(No.2018KTSCX063 and 2013KJCX0081) the Science and Technology Planning Project of Guangdong Province(No.2014A020216045) the 2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant(2020LKSFG09A) the Guangdong Key Discipline Fund at GTIIT 

主　　题：TiO_(2)nanosheets Oxygen vacancy Metallic bismuth Sandwiched heterostructure Photocatalysis 

摘      要：The conventional p-n heterojunction photocatalysts suffer from the incompatibility between the interfacial charge transfer efficiency and the redox ability of charge *** optimize the interfacial charge transfer of the conventional BiOI/TiO_(2) p-n photocatalyst,we synthesized the BiOI/Bi/TiO_(2) ternary photocatalyst with sandwiched metallic bismuth(Bi~0)by the oxygen-vacancy assisted *** DFT calculation and structural characterizations confirmed the reaction of the electron-rich oxygen vacancies in the 2D-TiO_(2) nanosheets(TiO_(2)-NS)with the adsorbed BiO~+*** reaction broke the Bi-O bonds to form Bi^(0) nanoparticles in-situ at the interface but still maintained the p-n heterojunction *** NO-TPD and XRD analyses for samples correlated the Bi~0 formation with the oxygen vacancy concentrations *** sandwiched Bi~0 functioned as an electronic transfer mediator like that in the Z-scheme *** with 0.20 BiOI/TiO_(2)-NP(NP,Nanoparticles),0.20 BiOI/Bi/TiO_(2)-NS-a(NS,Nanosheet)showed a much improved catalytic performance,i.e.,duplicated apparent quantum yield(AQY)and triplicated reaction rate constant(k).Also,the formation mechanism and the reaction mechanism were investigated in *** work provides a new strategy for the improving of the conventional p-n photocatalysts and new insights into the nature of the photocatalysis.