J. Mater. Sci. Technol. ›› 2023, Vol. 156: 64-71.DOI: 10.1016/j.jmst.2023.03.003

• Research Article • Previous Articles     Next Articles

A hierarchical Bi-MOF-derived BiOBr/Mn0.2Cd0.8S S-scheme for visible-light-driven photocatalytic CO2 reduction

Jiahui Huaa,1, Zhongliao Wanga,1, Jinfeng Zhanga,1, Kai Daia,*, Chunfeng Shaoa,*, Ke Fanb,*   

  1. aLaboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Huaibei Normal University, Huaibei 235000, China;
    bState Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
  • Received:2023-02-14 Revised:2023-02-26 Accepted:2023-03-05 Published:2023-09-01 Online:2023-03-11
  • Contact: * E-mail addresses: daikai940@chnu.edu.cn (K. Dai), shaocf@chnu.edu.cn (C. Shao), kefan@kth.se (K. Fan) .
  • About author:1 These authors contributed equally to this work.

Abstract: S-scheme heterojunctions have promising applications in photocatalytic CO2 reduction due to their unique structure and interfacial interactions, but improving their carrier separation efficiency and CO2 adsorption capacity remains a challenge. In this work, highly dispersed MOF-BiOBr/Mn0.2Cd0.8S (MOF-BiOBr/MCS) S-scheme heterojunctions with high photocatalytic CO2 reduction performance were constructed. The intimate contact between the MCS nano-spheres and the nanosheet-assembled MOF-BiOBr rods, driven by the internal electric field, accelerates the charge transfer along the S-scheme pathway. Moreover, the high specific surface area of MOFs is preserved to provide abundant active sites for reaction/adsorption. The formation of MOF-BiOBr/MCS S-scheme heterojunction is confirmed by theoretical calculations. The optimum MOF-BiOBr/MCS shows excellent activity in CO2 reduction, affording a high CO evolution rate of 60.59 µmol h-1 g-1. The present work can inspire the exploration for the construction of effective heterostructure photocatalysts for photoreduction CO2.

Key words: Mn0.2Cd0.8S, Bi-MOF, CO2 reduction, S-scheme heterojunction