Modulate the electronic structure of Cu_(7)S_(4)nanosheet on TiO_(2)for enhanced photocatalytic hydrogen evolution
作者机构：State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China School of Materials EngineeringChangshu Institute of TechnologyChangshu 215500China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第4期
页 面：4488-4493页
核心收录：
学科分类：081704[工学-应用化学] 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：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
主 题：Cu_(7)S_(4)nanosheet Cu^(2+) electronic structure regulation heterojunction photocactalytic hydrogen evolution
摘 要：TiO_(2)is a promising photocatalyst due to its high thermodynamic stability and ***,its applications have been still limited because of the high recombination rate of electron-hole ***,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 *** 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),*** 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 *** 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 *** 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.
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