Modulate the electronic structure of Cu_(7)S_(4)nanosheet on TiO_(2)for enhanced photocatalytic hydrogen evolution  

作　　者：Wenqiang Liu Huiping Peng Leigang Li Mingmin Wang Hongbo Geng Xiaoqing Huang 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China [2]School of Materials Engineering,Changshu Institute of Technology,Changshu 215500,China

出　　处：《Nano Research》2023年第4期4488-4493,共6页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2020YFB1505802);the Ministry of Science and Technology(No.2017YFA0208200);the National Natural Science Foundation of China(Nos.22025108,U21A20327,and 22121001);the start-up fundings from Xiamen University.

摘　　要：TiO_(2)is a promising photocatalyst due to its high thermodynamic stability and non-toxicity.However,its applications have been still limited because of the high recombination rate of electron-hole pairs.Herein,we show that by combining heterojunction construction and electronic structure regulation,the electron-hole pairs in TiO_(2)can be effectively separated for enhanced photocatalytic hydrogen evolution.The optimized Cu_(7)S_(4)nanosheet decorated TiO_(2)achieves much enhanced H_(2)evolution rate(11.5 mmol·g−1·h−1),which is 13.8 and 4.2 times of that of TiO_(2)and Cu_(7)S_(4)/TiO_(2),respectively.The results of photoluminescence spectroscopy,transient photocurrent spectra,ultraviolet-visible diffuse reflectance spectra,and electrochemical impedance spectroscopy collectively demonstrate that the enhanced photocatalytic performance of Air-Cu_(7)S_(4)/TiO_(2)is attributed to the effective separation of charge carriers and widened photoresponse range.The electron paramagnetic resonance and X-ray photoelectron spectroscopy results indicate that the increase of Cu2+in the Cu_(7)S_(4)nanosheet after calcination can promote the charge transfer.This work provides an effective method to improve the electron migration rate and charge separation of TiO_(2),which holds great significance for being extended to other material systems and beyond.

关 键 词：Cu_(7)S_(4)nanosheet Cu^(2+) electronic structure regulation HETEROJUNCTION photocactalytic hydrogen evolution 

分 类 号：O644.1[理学—物理化学]