Realizing improved CO2 photoreduction in Z-scheme Bi4O5Br2/AgBr heterostructure

作者：Jin, Xiaoli; Cao, Jian; Wang, Huiqing; Lv, Chade; Xie, Haiquan^*; Su, Fengyun; Li, Xin; Sun, Ruixue; Shi, Shukui; Dang, Mengfei; Ye, Liqun^*

来源：Applied Surface Science, 2022, 598: 153758.

DOI：10.1016/j.apsusc.2022.153758

• Photocatalysis
• CO2 reduction
• Solar energy
• Z-scheme heterojunction
• Carrier separation
• Photocatalysis

Architecting Z-scheme heterojunction can restrain the recombination of photoinduced carriers to improve the photocatalytic performance. However, it still lacks high-efficiency catalysts for sustainable photoreduction of CO2. Herein, an Ag-bridged Z-scheme Bi4O5Br2/AgBr heterostructure is successfully developed, which enables room-temperature CO2 reduction driven by solar energy. In this catalyst, the Ag mediator acts as a bridge to shuttle electrons between Bi4O5Br2 and AgBr, separating the electron-hole pairs efficiently and maintaining the original strong reduction reaction. As a result, Z-scheme Bi4O5Br2/AgBr heterostructures show obviously promoted performance of photocatalytic CO2 reduction in contrast with pristine Bi4O5Br2, delivering a high CO2 conversion activity of 6.6 and 1.8 mu mol g-1h-1 for CO and CH4 products, respectively. This study reports an effective reference of Z-scheme Bi4O5Br2/AgBr heterojunction for satisfactory photocatalytic solar energy conversion and synthesis of high value-added products from CO2.

• 单位
  南阳理工学院