J. Mater. Sci. Technol. ›› 2022, Vol. 124: 202-208.DOI: 10.1016/j.jmst.2021.10.059

• Research Article • Previous Articles     Next Articles

Selective solar-driven CO2 reduction mediated by 2D/2D Bi2O2SiO3/MXene nanosheets heterojunction

Kai Wang, Quanpeng Wang, Kaijia Zhang, Guohong Wang(), Hukun Wang()   

  1. College of Urban and Environmental Sciences, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Hubei Normal University, Huangshi 435002, China
  • Received:2021-08-24 Revised:2021-10-27 Accepted:2021-10-30 Published:2022-10-10 Online:2022-03-30
  • Contact: Guohong Wang,Hukun Wang
  • About author:wanghukun@163.com (H. Wang)
    E-mail addresses:. wangkai@hbnu.edu.cn (K. Wang),

Abstract:

Photocatalytic CO2 reduction reaction (CO2RR) is an environment-friendly technique for clean fuel generation. Developing low-cost and efficient photocatalyst/cocatalyst systems for boosting CO2RR is still a challenge. Herein, a novel Bi2O2SiO3/Ti3C2 2D/2D heterojunction photocatalysts are successfully prepared by in situ growth of Bi2O2SiO3 on the surface of ultrathin Ti3C2 nanosheets, a kind of MXenes. The observed Bi2O2SiO3/Ti3C2 (BOSO/TC-2) hybrids exhibit a large interface contact area companied with enhanced CO2 adsorption capability, illustrating excellent 2D/2D interfacial charge transfer behaviors. The total yield of products obtained on the optimized BOSO/TC-2 photocatalyst is 3.8 times that of pristine Bi2O2SiO3 nanosheets and achieve near 90% selectivity for CO over CH3OH without sacrificial agents, which was higher than most all inorganic Bi-based photocatalysts. Moreover, the mechanism of enhanced photocatalytic activity and reaction pathway was proposed in terms of the DFT study and in situ FTIR analysis. This work might provide new semiconductor/cocatalyst systems for selective CO2 photoreduction to solar fuels.

Key words: Bi2O2SiO3, MXene, Heterojunction, CO2 photoreduction, Selectivity