J. Mater. Sci. Technol. ›› 2022, Vol. 124: 164-170.DOI: 10.1016/j.jmst.2022.01.030

• Research Article • Previous Articles     Next Articles

S-scheme CoTiO3/Cd9.51Zn0.49S10 heterostructures for visible-light driven photocatalytic CO2 reduction

Bo Sua, Haowei Huangb, Zhengxin Dinga,*(), Maarten B.J. Roeffaersb, Sibo Wanga,*(), Jinlin Longa,*()   

  1. aState Key Lab of Photocatalysis on Energy and Environment, College of Chemistry Fuzhou University, Fuzhou 350108, China
    bcMACS, Department of Microbial and Molecular Systems, KU Leuven, Celestijnenlaan 200F, Leuven 3001, Belgium
  • Received:2021-10-25 Revised:2022-01-05 Accepted:2022-01-11 Published:2022-10-10 Online:2022-04-04
  • Contact: Zhengxin Ding,Sibo Wang,Jinlin Long
  • About author:jllong@fzu.edu.cn (J. Long)
    sibowang@fzu.edu.cn (S. Wang),
    E-mail addresses:. zxding@fzu.edu.cn (Z. Ding),

Abstract:

Cd1-xZnxS solid solutions with strong light absorption are promising materials for solar-driven CO2 reduction; however, their relatively weak redox ability and intrinsic photo-corrosion limit their further development as a photocatalyst. The addition of a second photocatalyst with a suitable band structure to construct a S-scheme photocatalytic system can solve both problems simultaneously. Here, we report a S-scheme photocatalyst based on the heterostructure of CoTiO3/Cd9.51Zn0.49S10 (abbreviated as CoTiO3/CdZnS) that enables the efficient photocatalytic reduction of CO2. Detailed physicochemical characterization resolves the S-scheme charge transfer mechanism in this composite photocatalyst. With the well-designed structure of particles and desirable band offsets, this hybrid system offers visible light absorption in a broad spectral region, large surface area, strong redox ability, and fast carrier separation and transportation. Under visible-light illumination, the CoTiO3/CdZnS hybrid system displays a CO formation rate of about 11 mmol h-1 g-1 combined with a long-term operational stability. Besides, a high apparent quantum efficiency (AQE) of 7.27% is realized for the CO2-to-CO reduction reaction by the optimized CoTiO3/CdZnS hybrid under 420 nm monochromatic light irradiation.

Key words: Photocatalysis, CO2 reduction, S-scheme, Metal sulfides, Heterostructure