Tunable crystal structure of Cu-Zn-Sn-S nanocrystals for improving photocatalytic hydrogen evolution enabled by copper element regulation  

作　　者：Zhe Yin Min Hu Jun Liu Hao Fu Zhijie Wang Aiwei Tang 

机构地区：[1]Key Laboratory of Luminescence and Optical Information,Ministry of Education,School of Science,Beijing Jiaotong University,Beijing 100044,China [2]Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [3]Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [4]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Semiconductors》2022年第3期68-73,共6页半导体学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.61974009,62075005,and 62105019).

摘　　要：Hydrogen energy is a powerful and efficient energy resource,which can be produced by photocatalytic water split-ting.Among the photocatalysis,multinary copper-based chalcogenide semiconductor nanocrystals exhibit great potential due to their tunable crystal structures,adjustable optical band gap,eco-friendly,and abundant resources.In this paper,Cu-Zn-Sn-S(CZTS)nanocrystals with different Cu content have been synthesized by using the one-pot method.By regulating the surface ligands,the reaction temperature,and the Cu content,kesterite and hexagonal wurtzite CZTS nanocrystals were obtained.The critical factors for the controllable transition between two phases were discussed.Subsequently,a series of quatern-ary CZTS nanocrystals with different Cu content were used for photocatalytic hydrogen evolution.And their band gap,energy level structure,and charge transfer ability were compared comprehensively.As a result,the pure hexagonal wurtzite CZTS nano-crystals have exhibited an improved photocatalytic hydrogen evolution activity.

关 键 词：photocatalytic hydrogen evolution WURTZITE Cu-Zn-Sn-S nanocrystals 

分 类 号：TQ116.2[化学工程—无机化工] TQ426[一般工业技术—材料科学与工程] TB383.1