Tuning photocatalytic performance of Cs_(3)Bi_(2)Br_(9)perovskite by g-C_(3)N_(4)for C(sp^(3))–H bond activation  

作　　者：Zhang-Jun Bai Yu Mao Bing-Hao Wang Lang Chen Sheng Tian Biao Hu You-Ji Li Chak-Tong Au Shuang-Feng Yin 

机构地区：[1]Advanced Catalytic Engineering Research Center of the Ministry of Education,State Key Laboratory of Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China [2]Key Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials in Hunan Province,Jishou University,Jishou 416000,China [3]College of Chemical Engineering,Fuzhou University,Fuzhou 350002,China

出　　处：《Nano Research》2023年第5期6104-6112,共9页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21938002,21725602,21776064,and 21975069);the Innovative Research Groups of Hunan Province(No.2019JJ10001);Science and Technology Planning Project of Hunan Province(No.2019RS3010);C.T.Au thanks HNU for an adjunct professorship.

摘　　要：All-inorganic halide perovskite(IHP)has been deemed promising in photocatalysis due to tunable bandgap and long lifetime of charge carriers.However,unsatisfactory photocatalytic activity and low stability prevent its practical applications.Rational construction of heterojunctions has been proved to be an efficient way to circumvent these obstacles.Herein,g-C_(3)N_(4)nanosheet was employed to construct a 2D/2D(2D:two-dimensional)heterostructure with Cs_(3)Bi_(2)Br_(9)through an electrostatic self-assembly process.Owing to the efficient transfer of photogenerated charge carriers,the activity of Cs_(3)Bi_(2)Br_(9)was boosted with enhanced generation of carbon centered radicals.The optimized 10%Cs_(3)Bi_(2)Br_(9)/g-C_(3)N_(4)composite displays the highest benzaldehyde formation rate of 4.53 mmol·h^(−1)·g^(−1)under visible light,which is 41.8 and 2.3 times that of individual g-C_(3)N_(4)and Cs_(3)Bi_(2)Br_(9),respectively.The stability of Cs_(3)Bi_(2)Br_(9)nanosheets and its selectivity for benzaldehyde(from 65%of Cs_(3)Bi_(2)Br_(9)to 90%of the composite)was enhanced by reducing its surface energy and tuning the reaction pathway,respectively.

关 键 词：photocatalysis Cs_(3)Bi_(2)Br_(9)/g-C_(3)N_(4)heterojunction selective oxidation toluene BENZALDEHYDE 

分 类 号：O62[理学—有机化学]