Abstract
Efficient, low-cost photocatalysts with mild synthesis conditions and stable photocatalytic behavior have always been the focus in the field of photocatalysis. This study proves that non-quantum-dot Cs(2)PbI(2)Cl(2)-based materials, created by a simple method, can be successfully employed as new high-efficient photocatalysts. The results demonstrate that two-dimensional Cs(2)PbI(2)Cl(2) perovskite can achieve over three times higher photocatalytic performance compared to three-dimensional CsPbBr(3) perovskite. Moreover, the photocatalytic performance of Cs(2)PbI(2)Cl(2) can be further improved by constructing a heterojunction structure, such as Cs(2)PbI(2)Cl(2)/CsPbBr(3). Cs(2)PbI(2)Cl(2) can connect well with CsPbBr(3) through a simple method, resulting in tight bonding at the interface and efficient carrier transfer. Cs(2)PbI(2)Cl(2)/CsPbBr(3) exhibits notable 5-fold and 10-fold improvements in photocatalytic performance and rate compared to CsPbBr(3). Additionally, Cs(2)PbI(2)Cl(2)/CsPbBr(3) demonstrates superb stable catalytic performance, with nearly no decrease in photocatalytic performance after 7 months (RH = 20% ± 10, T = 25 °C ± 5). This study also reveals that the photocatalytic process based on Cs(2)PbI(2)Cl(2)/CsPbBr(3) can directly oxidize organic matter using holes, without relying on the generation of intermediate reactive oxygen species from water or oxygen (such as ·OH or ·O(2)(-)), showcasing further potential for achieving high photocatalytic efficiency and selectivity in anhydrous/anaerobic catalytic reactions and treating recalcitrant pollutants.