J. Mater. Sci. Technol. ›› 2022, Vol. 117: 109-119.DOI: 10.1016/j.jmst.2021.11.046

• Research Article • Previous Articles     Next Articles

In-situ fabrication of Bi2S3/BiVO4/Mn0.5Cd0.5S-DETA ternary S-scheme heterostructure with effective interface charge separation and CO2 reduction performance

Zhiwei Zhaoa, Xiaofeng Lia, Kai Daia,*(), Jinfeng Zhanga, Graham Dawsonb   

  1. aLaboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei 235000, China
    bDepartment of Chemistry, Xi’an Jiaotong Liverpool University, Suzhou 215123, China
  • Accepted:2021-08-15 Published:2022-07-30 Online:2022-08-01
  • Contact: Kai Dai
  • About author:∗E-mail address: daikai940@chnu.edu.cn (K. Dai).

Abstract:

Exploring new and efficient photocatalysts to boost photocatalytic CO2 reduction is of critical importance for solar-to-fuel conversion. In this study, through the in-situ growth method, a series of S-scheme mechanism Bi2S3/BiVO4/Mn0.5Cd0.5S-DETA nanocomposites with good photocatalytic activity were synthesized. The extremely small size of Mn0.5Cd0.5S-DETA nanoparticles provides more active sites for photocatalytic reactions. In order to solve the serious shortcomings of sulfide photo-corrosion, BiVO4 were introduced as oxidation catalyst to consume too many holes and improve the stability of the material. In addition, the in-situ growth method produces the reduction cocatalyst Bi2S3 during the BiVO4 and Mn0.5Cd0.5S-DETA recombination process, thereby improving the efficiency of charge transfer at their interface contact. The ternary composite unveils a higher CO2-reduction rate (44.74 μmol g-1 h-1) comparing with pristine BiVO4 (14.11 μmol g-1 h-1). The enhanced photocatalytic CO2 reduction performance is due to the special interface structure of the S-scheme Bi2S3/BiVO4/Mn0.5Cd0.5S-DETA photocatalyst, which facilitates the charge separation at the interface and improves its photocatalytic activity and stability.

Key words: Step-scheme heterojunction, Bi2S3, BiVO4, Mn0.5Cd0.5S, Photocatalytic CO2 reduction