A robust perovskite photosensitizer for efficient visible-light-driven CO₂ reduction

Efficient conversion of CO₂ to valuable fuels via artificial photosynthesis under visible-light irradiation is of great significance. However, traditional photocatalytic systems based on homogeneous photosensitizers (PSs) usually suffer from high costs and poor stability. Herein, we report all-inorganic perovskite CsPbBr₃ quantum dots (QDs) as a robust PS for efficient visible-light-driven CO₂ photoreduction. This perovskite PS-based photocatalytic system, using NiCo-layered double hydroxide (LDH) as a catalyst, offers 204.4 μmol g⁻¹ h⁻¹ of CO evolution rate and 100% selectivity under visible-light irradiation over 35 h. The efficient electron transfer from CsPbBr₃ QDs to the catalyst is demonstrated by ultrafast transient absorption analysis. The key role of oleylamine on CsPbBr₃ QDs as a sacrificial electron donor in improving the photostability of the photocatalytic system is verified via systematic control experiments. This work sheds light on the rational design of efficient CO₂ photocatalytic systems with low cost and long-term photostability.