Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2025, Vol. 71: 353-362.DOI: 10.1016/S1872-2067(24)60275-5

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All solid-solution S-scheme heterojunction with adjustable internal electric field for highly efficient photocatalytic activity

Shiya Yuea,1, Rong Lia,b,*,1(), Zhengrong Weia, Yun Gaoa,*(), Karen Wilsonc, Xuxing Chena,*()   

  1. aMinistry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, Hubei, China
    bSchool of Intelligent Manufacturing, Hubei University, Wuhan 430062, Hubei, China
    cCentre for Catalysis and Clean Energy, School of Environment and Science, Griffith University, Brisbane, Queensland, 4222, Australia
  • Received:2024-12-31 Accepted:2025-02-09 Online:2025-04-18 Published:2025-04-13
  • Contact: * E-mail: rli@hubu.edu.cn (R. Li), gaoyun@hubu.edu.cn (Y. Gao), cxx0613@hubu.edu.cn (X. Chen).
  • About author:

    1Contributed to this work equally.

  • Supported by:
    National Natural Science Foundation of China(21801071);National Natural Science Foundation of China(21902046);Overseas Expertise Introduction Center for Discipline Innovation(D18025);Natural Science Foundation of Hubei Provincial(2018CFB171);Hubei Provincial Department of Education(D20221001);open foundation of the State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences;Opening Fund of Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, Hubei Engineering University(2023K003)

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Abstract:

Developing an efficient photocatalyst is the key to realize the practical application of photocatalysis. The S-scheme heterojunction has great potential in photocatalysis due to its unique charge-carrier migration pathway, effective light absorption and high redox capacity. However, further enhancing the built-in electric field of the S-scheme, accelerating carrier separation, and achieving higher photocatalytic performance remain unresolved challenges. Herein, based on the continuously adjustable band structure of continuous solid-solution, a novel 0D/2D all solid-solution S-scheme heterojunction with adjustable internal electric field was designed and fabricated by employing a solid-solution of ZnxCd1-xS and Bi2MoyW1-yO6 respectively as reduction and oxidation semiconductors. The synergistic optimization of effective light absorption, fast photogenerated carrier separation, and high redox potential leads can be tuned to promote photocatalytic activity. Under visible light, the S-scheme system constructed by Zn0.4Cd0.6S quantum dot (QDs) and Bi2Mo0.2W0.8O6 monolayer exhibits a high rate for photocatalytic degradation C2H4 (150.6 × 10-3 min-1), which is 16.5 times higher than that of pure Zn0.4Cd0.6S (9.1 × 10-3 min-1) and 53.8 times higher than pure Bi2Mo0.2W0.8O6 (2.8 × 10-3 min-1). Due to the unique charge-carrier migration pathway, photo-corrosion of ZnxCd1-xS is further inhibited simultaneously. In-situ irradiation X-ray photoelectron spectroscopy, photoluminescence spectroscopy, time-resolved photoluminescence, transient absorption spectroscopy and electron paramagnetic resonance provide compelling evidence for interfacial charge transfer via S-scheme pathways, while in-situ diffuse reflectance infrared Fourier transform spectroscopy identifies the reaction pathway for C2H4 degradation. This novel S-scheme photocatalysts demonstrates excellent performance and potential for the practical application of the fruits and vegetables preservation at room temperatures.

Key words: Photocatalysis, S-scheme, Solid-solution, Internal electric field, Ethylene