Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1102-1107.doi: 10.1007/s40242-020-0308-7

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Reducing Packing Factor of ZnIn2S4 to Promote Photocatalytic Activity

HU Keyan1,2, XU Zian3, LIU Yiting4, HUANG Fuqiang1,5   

  1. 1. State Key Laboratory of High-performance Ceramics and Super Fine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;
    2. School of Mechanical and Electrical Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, P. R. China;
    3. Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, P. R. China;
    4. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, P. R. China;
    5. Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2020-09-30 Revised:2020-11-13 Online:2020-12-01 Published:2020-11-13
  • Contact: HUANG Fuqiang E-mail:huangfq@mail.sic.ac.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21871008), the Key Research Program of Frontier Science of Chinese Academy of Sciences(No.QYZDJ-SSW-JSC013), the Natural Science Foundation of Jiangxi Province, China (Nos.20151BAB212008, GJJ150912) and the Science and Technology Project of Jingdezhen, China(No.20192GYZD008-21).

Abstract: Due to the quite sluggish charge-carrier separation in semiconductor photocatalysts, the photocatalytic activity of these materials is still far inferior than anticipated. Herein, a novel approach to reducing the packing factor(PF) of ZnIn2S4 semiconductors to improve the charge-carrier separation is offered. The well-crystallized Zn1-xIn2S4-x(x=0, 0.05, 0.1) powders were productively prepared through solid-state reactions. Their structures were verified by the high-resolution transmission electron microscopy, powder X-ray diffraction, and X-ray photoelectron spectroscopy. The PF values of Zn1-xIn2S4-x(x=0, 0.05, 0.1) samples were calculated to be 0.683, 0.651, and 0.618, respectively. The reduction of the PF for Zn1-xIn2S4-x with increasing x can promote the separation of photoexcited carriers, and this process was endorsed by their photoelectric response and photoluminescence emission spectra. The Zn0.9In2S3.9 sample with a lower PF value presents roughly 21 times higher photocurrent density and four times higher photodegrading rate of methyl orange than those of pristine ZnIn2S4.

Key words: Charge-carrier separation, Packing factor, Zn1-xIn2S4-x, Solid state reaction, Photocatalytic activity