Interfacial chemical bond-modulated Z-scheme Cs2AgBiBr6/WO3 enables stable and highly efficient photocatalysis

Lead-free double perovskite Cs2AgBiBr6 has been widely devoted to photocatalysis owing to its outstanding optical properties. However, insufficient redox capacity and high photogenerated carrier recombination effi-ciency of Cs2AgBiBr6 would limit its effective performance. Herein, we have developed Cs2AgBiBr6/WO3 Z-scheme heterojunction for enabling stable and highly efficient photocatalysis by building interfacial chemical bonds at the interface. The internal electronic structure of Z-scheme heterojuction by regulating close coupling interfacial chemical bonds at the hetero-interface could accelerate the charge transfer, enhance the separation efficiency of photogenerated carriers and maximize the redox ability. The Cs2AgBiBr6/WO3 exhibits superior photocatalytic degradation, which could degrade 93.64% and 100% (complete mineralization) of Methyl Orange and Rhodamine B within 30 min and 25 min, respectively. The effective degradation of pollutants is ascribed to the electron-transfer mechanism of Z-scheme with reducing recombination rate of the photogenerated carriers, which could produce dominant & BULL;O2- and supporting & BULL;OH to effectively degrade the pollutants.