Identification of Halogen-Associated Active Sites on Bismuth-Based Perovskite Quantum Dots for Efficient and Selective CO 2 -to-CO Photoreduction

All-inorganic Pb-free bismuth (Bi) halogen perovskite quantum dots (PQDs) with distinct structural and photoelectric properties provide plenty of room for selective photoreduction of CO2. However, the efficient conversion of CO2-to-CO with high selectivity on Bi-based PQDs driven by solar light remains unachieved, and the precise reaction path/mechanism promoted by the surface halogen-associated active sites is still poorly understood. Herein, we screen a series of nontoxic and stable Cs3Bi2X9 (X = Cl, Br, I) PQDs for selective photocatalytic reduction of CO2-to-CO at the gas–solid interface. Among all the reported pure-phase PQDs, the as-synthesized Cs3Bi2Br9 PQDs exhibited the highest CO2-to-CO conversion…

• NN
  National Natural Science Foundation of China

  Awards: 21777011, 21822601
• MO
  Ministry of Education of the People's Republic of China

  Awards: B20030, ZYGX2019Z021
• CP
  China Postdoctoral Science Foundation

  Award: 2020M673175
• SA
  State Administration of Foreign Experts Affairs

  Award: B20030