Chinese Journal of Catalysis ›› 2023, Vol. 51: 55-65.DOI: 10.1016/S1872-2067(23)64481-X

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Visible light-driven dehydrocoupling of thiols to disulfides and H2 evolution over PdS-decorated ZnIn2S4 composites

Xiao-Juan Li, Ming-Yu Qi, Jing-Yu Li, Chang-Long Tan, Zi-Rong Tang(), Yi-Jun Xu()   

  1. College of Chemistry, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, Fujian, China
  • Received:2023-04-23 Accepted:2023-06-29 Online:2023-08-18 Published:2023-09-11
  • Contact: *E-mail: zrtang@fzu.edu.cn (Z.-R. Tang), yjxu@fzu.edu.cn (Y.-J. Xu).
  • Supported by:
    Natural Science Foundation of China(22172030);Natural Science Foundation of China(22072023);Natural Science Foundation of China(21872029);Natural Science Foundation of China(21173045);Natural Science Foundation of China(U1463204);Program for Leading Talents of Fujian Universities;Program for National Science and Technology Innovation Leading Talents(00387072);Natural Science Foundation of Fujian Province(2017J07002);Natural Science Foundation of Fujian Province(019J01631);1st Program of Fujian Province for Top Creative Young Talents

Abstract:

The simultaneous utilization of photogenerated electrons and holes in one cooperative photoredox system for the dehydrocoupling of thiols into value-added disulfides and clean hydrogen (H2) fuel meets the development criteria of green chemistry. Herein, we report the synthesis and application of cocatalyst PdS decorated ZnIn2S4 (PdS-ZIS) composites for photocatalytic coupling of thiols into disulfides and H2 evolution under visible light irradiation. The superior photocatalytic performance over PdS-ZIS composites compared with blank ZIS is attributed to the function of PdS as oxidation cocatalyst, which dramatically promotes the separation and transfer of photogenerated charge carriers due to its excellent hole trapping ability. In-situ Fourier transform infrared spectra reveal the dynamic variation of reactants on the catalyst surface. Electron paramagnetic resonance technology confirms that sulfur-centered radicals are the key reaction intermediates in this coupling process. Moreover, the application of PdS-ZIS composites to the dehydrocoupling of various thiols with different substituent groups into the corresponding S-S coupling products has been demonstrated to be practicable. This work is expected to offer insights into the rational design of cocatalyst-decorated semiconductor photocatalysts with efficient utilization of photogenerated electrons and holes for the co-production of high-value chemicals and clean H2 energy in a cooperative photoredox catalysis process.

Key words: Oxidation cocatalyst, ZnIn2S4, Photoredox reaction, Disulfide synthesis, Hydrogen evolution