Layered double hydroxide nanosheets activate CsPbBr3 nanocrystals for enhanced photocatalytic CO2 reduction

Halide perovskite nanocrystals are potential catalysts for CO2 photoreduction, while, the strong radiative recombination and insufficient stability limit their catalytic performance and application. Herein, we report that layered double hydroxide nanosheets activate CsPbBr3 nanocrystals (CLDH) for enhanced photocatalytic CO2 reduction. These CLDH heterojunctions show the remarkably enhanced CO2 photoreduction performance; without cocatalyst and sacrificial agent, the average electron consumption rate of CLDH (49.16 μmol·g−1·h−1) is approximately 3.7 times higher than that of pristine CsPbBr3. Also, CLDH catalyst exhibits a robust stability after ten cycles over 30 h.