Zeolite A‑Coated Mn-Doped Perovskite Quantum Dots Prepared by Vapor Deposition Crystallization for Reduction of CO₂

Zeolite A (LTA)-coated Mn-doped perovskite quantum dot CsPb_1–xMn_xCl₃@LTA (x = 0, 0.2, 0.4, 0.6, and 0.8) composites were fabricated by vapor deposition crystallization. LTA not only improved the water, light, and thermal stability of perovskite quantum dots but also limited the average size of perovskite quantum dots to less than 20 nm. Mn²⁺ doping improved the exciton lifetime of a perovskite quantum dot matrix. The photogenerated carriers generated by Mn²⁺ have a decay life of hundreds of microseconds, which effectively improves the photocatalytic efficiency. When x = 0.6, the total yield of CO and CH₄ was 1443.25 μmol g^–1 (1191.08 μmol g^–1 of CO and 252.17 μmol g^–1 of CH₄). After 5 catalytic cycles, the yields of CO and CH₄ remained at 53.77% and 62.27% of their original levels, respectively, indicating that CsPb_1–xMn_xCl₃@LTA has excellent photocatalytic application prospects.