Visible light responsive high-entropy Cs2AgInCl6 double perovskite nanoparticles photocatalyst with high water resistance

Metal halide double perovskite Cs₂AgInCl₆, as an environmentally friendly direct-bandgap semiconductor, emerged as a strong candidate for a new generation of environmentally friendly and stable photocatalysts due to its long carrier lifetime, non-toxicity, and moisture resistance. However, due to parity-forbidden transitions and high sensitivity to water, achieving higher-efficiency photocatalytic degradation in water remained an urgent challenge. Our study presented for the first time a high-entropy Cs 2 AgInCl 6 material Cs₂(Na₁/₂Ag₁/₂)(Mn₁/₃In₁/₃Bi₁/₃)Cl₆ (ANIBM DPNCs), which exhibited a remarkable visible light responsive and applicable to degrade pollutants in aqueous environments. In comparison with existing photocatalysts within the halide perovskite family, ANIBM DPNCs has been shown to exhibit higher photocatalytic efficiency and to demonstrate low sensitivity to various environments such as water and oxygen. Within 30 min, the RhB (10 mg/L) was completely degraded, while demonstrating comprehensive phase stability. Following four cycles of reuse and four months of atmospheric exposure, ANIBM DPNCs exhibited no structural alteration and retained its original photocatalytic performance. Notably, at elevated temperatures of 483 K, a remarkable resilience was exhibited, with the material retaining its original crystal structure. The results demonstrated that this material can be efficiently synthesized, is non-toxic, and exhibited outstanding photocatalytic performance and stability. This advancement successfully overcame the limitations of Cs 2 AgInCl 6 in photocatalysis, which were previously restricted to ultraviolet response and degradation in ethanol solutions. Our research provided a solid foundation for the transformation of Cs 2 AgInCl 6 from a low-efficiency luminescent material into a high-performance photocatalyst.