Atomic‐level insight of sulfidation‐engineered Aurivillius‐related Bi2O2SiO3 nanosheets enabling visible light low‐concentration CO2 conversion
Kai Wang,
Yue Du,
Yuan Li,
Xiaoyong Wu,
Haiyan Hu,
Guohong Wang,
Yao Xiao,
Shulei Chou,
Gaoke Zhang
Affiliations
Kai Wang
College of Urban and Environmental Sciences, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Institute for Advanced Materials Hubei Normal University Huangshi Hubei China
Yue Du
College of Urban and Environmental Sciences, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Institute for Advanced Materials Hubei Normal University Huangshi Hubei China
Yuan Li
School of Resources and Environmental Engineering Wuhan University of Technology Wuhan Hubei China
Xiaoyong Wu
School of Resources and Environmental Engineering Wuhan University of Technology Wuhan Hubei China
Haiyan Hu
Institute for Carbon Neutralization, College of Chemistry and Materials Engineering Wenzhou University Wenzhou Zhejiang China
Guohong Wang
College of Urban and Environmental Sciences, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Institute for Advanced Materials Hubei Normal University Huangshi Hubei China
Yao Xiao
Institute for Carbon Neutralization, College of Chemistry and Materials Engineering Wenzhou University Wenzhou Zhejiang China
Shulei Chou
Institute for Carbon Neutralization, College of Chemistry and Materials Engineering Wenzhou University Wenzhou Zhejiang China
Gaoke Zhang
School of Resources and Environmental Engineering Wuhan University of Technology Wuhan Hubei China
Abstract Unraveling atomic‐level active sites of layered photocatalyst towards low‐concentration CO2 conversion is still challenging. Herein, the yield and selectivity of photocatalytic CO2 reduction of the Aurivillius‐related oxide semiconductor Bi2O2SiO3 nanosheet (BOSO) were largely improved using a surface sulfidation strategy. The experiment and theoretical calculation confirmed that surface sulfidation of the Bi2O2SiO3 nanosheet (S‐BOSO, 6.28 nm) redistributed the charge‐enriched Bi sites, extended the solar spectrum absorption to the whole visible range, and considerably enhanced the charge separation, in addition to creating new reaction active sites, as compared to pristine BOSO. Subsequently, surface sulfidation played a switchable role, wherein S‐BOSO showed a very high CH3OH generation rate (12.78 µmol g−1 for 4 h, 78.6% selectivity) from low‐concentration CO2 (1000 ppm) under visible light irradiation, which outperforms most of the state‐of‐the‐art photocatalysts under similar conditions. This study presents an atomic‐level modification protocol for engineering reactive sites and charge behaviors to promote solar‐to‐energy conversion.
