Recent Advances and Future Perspectives of Lead‐Free Halide Perovskites for Photocatalytic CO2 Reduction

Abstract It is still challenging to design and develop the state‐of‐the‐art photocatalysts toward CO 2 photoreduction. Enormous researchers have focused on the halide perovskites in the photocatalytic field for CO 2 photoreduction, due to their excellent optical and physical properties. The toxicity of lead‐based halide perovskites prevents their large‐scale applications in photocatalytic fields. In consequence, lead‐free halide perovskites (LFHPs) without the toxicity become the promising alternatives in the photocatalytic application for CO 2 photoreduction. In recent years, the rapid advances of LFHPs have offer new chances for the photocatalytic CO 2 reduction of LFHPs. In this review, we summarize not only the structures and properties of A 2 BX 6 , A 2 B(I)B(III)X 6 , and A 3 B 2 X 9 ‐type LFHPs but also their recent progresses on the photocatalytic CO 2 reduction. Furthermore, we also point out the opportunities and perspectives to research LFHPs photocatalysts for CO 2 photoreduction in the future.