J. Mater. Sci. Technol. ›› 2024, Vol. 193: 73-80.DOI: 10.1016/j.jmst.2024.01.021

• Research Article • Previous Articles     Next Articles

Promoting photocatalytic hydrogen evolution by modulating the electron-transfer in an ultrafast timescale through Mo-S6 configuration

Yi Lia,b, Shan Yub, Yuehan Caob, Yue Huangb, Qiaohao Wangb, Yuangang Duanb, Lina Lic, Kaibo Zhengd,e, Ying Zhoua,b,*   

  1. aNational Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    bSchool of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
    cShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    dDepartment of Chemical Physics and NanoLund Chemical Center, Lund University P.O. Box 124, 22100 Lund, Sweden
    eDepartment of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
  • Received:2023-11-16 Revised:2023-12-29 Accepted:2024-01-02 Published:2024-09-10 Online:2024-09-05
  • Contact: *National Key Laboratory of Oil and Gas Reservoir Ge-ology and Exploitation, Southwest Petroleum University, Chengdu 610500, China. E-mail address: yzhou@swpu.edu.cn (Y. Zhou).

Abstract: Maximizing ultrafast electron-transfer kinetics in semiconductor is pivotal but challenging for high-efficiency solar-to-energy during the photocatalytic reaction process due to the intrinsic property of photocatalysts with low surface electron density. Herein, a model photocatalyst CdS@Mo is synthesized through a typical hydrothermal method for modulating the ultrafast electron-transfer to enhance the surface electron density. X-ray absorption fine spectra (XAFS) reveal that Mo is coordinated with S atoms to form a Mo-S6 configuration which is different from common MoS2 and Mo foil structures. Based on the femtosecond transient absorption spectra (fs-TAS), it is found that the formation of Mo-S6 configuration contributes to the fast decay of CdS signal and Mo-S6 signal reactivation, illustrating the ultrafast electron-transfer (∼2.2 ps) from CdS to Mo-S6 configuration, which achieves the enhanced electron density of photocatalyst surface. Finally, a holistic photocatalytic performance evaluation discloses that the growing of Mo-S6 configuration obviously improves the photocatalytic hydrogen evolution (PHE) efficiency of CdS from 28.5 to 47.5 mmol g-1 h-1 with a solar-to-hydrogen (STH) efficiency of 0.10 % which is seldomly discussed in the system containing sacrificial agents. This work opens a new path to modulate the surface electron density by tuning the ultrafast electron-transfer for enhancing reaction efficiency in electron-density-dependent systems.

Key words: Electron-transfer, Photocatalytic hydrogen evolution, CdS, Mo-S6 configuration