Synthesis and Photocatalytic Application of Stable Lead‐Free Cs2AgBiBr6 Perovskite Nanocrystals

Abstract Lead halide perovskite nanocrystals (NCs) have demonstrated great potential as appealing candidates for advanced optoelectronic applications. However, the toxicity of lead and the intrinsic instability toward moisture hinder their mass production and commercialization. Herein, to solve such thorny problems, novel lead‐free Cs 2 AgBiBr 6 double perovskite NCs fabricated via a simple hot‐injection method are reported, which exhibit impressive stability in moisture, light, and temperature. Such materials are then applied into photocatalytic CO 2 reduction, achieving a total electron consumption of 105 µ mol g −1 under AM 1.5G illumination for 6 h. This study offers a reliable avenue for Cs 2 AgBiBr 6 perovskite nanocrystals preparation, which holds a great potential in the further photochemical applications.