J. Mater. Sci. Technol. ›› 2024, Vol. 193: 18-21.DOI: 10.1016/j.jmst.2023.12.054

• Research Article • Previous Articles     Next Articles

Charge transfer kinetic analysis of S-scheme heterojunction by femtosecond transient absorption spectrum

Juntao Yana, Jianjun Zhangb,*   

  1. aCollege of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
    bLaboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, 68 Jincheng Street, Wuhan 430078, China
  • Received:2023-12-22 Revised:2023-12-29 Accepted:2023-12-30 Published:2024-09-10 Online:2024-09-05
  • Contact: *E-mail address: zhangjianjun@cug.edu.cn (J. Zhang).

Abstract: An emerging S-scheme photocatalyst consisting of Ni-doped Zn0.2Cd0.8S quantum dots and TiO2 microspheres has been reported to show excellent H2 production performance and high benzylidene benzylamine evolution efficiency. To monitor the charge transfer dynamics in this S-scheme heterojunction, femtosecond transient absorption spectroscopy measurements are conducted. The charge transfer kinetic analysis confirms that S-scheme heterojunction promotes interfacial electron transfer and accelerates hole consumption. This work provides an in-depth explanation for the enhanced photocatalytic performance of S-scheme photocatalysts from the perspective of charge dynamics.

Key words: Electron transfer dynamics, Ultrafast electron transfer, Charge dynamics, Electron quenching, Lifetime