Highly Efficient Photocatalytic H2o2 Production On Core-Shell Cds@Cdin2s4 Heterojunction In Non-Sacrificial System

Hydrogen peroxide (H2O2) has received increasing attention as an important green-oxidate and energy carrier, but the H2O2 production industry has been plagued by high energy consumption and high environment risk in current processing technology. Photocatalytic production of H2O2 from earth-abundant water and molecular oxygen (O-2) is seemed to be a potential solution. Core-shell CdS@CdIn2S4 heterojunctions was prepared through a "sequential two-step hydrothermal growth" route. The photoexcited CdIn2S4 moiety transfers the conduction band electrons to CdS, leading to selective production of H2O2 via single-electron reduction of O-2. In contrast, the valence band holes photoformed on the CdS moieties are transferred to CdIn2S4, leading to efficient oxidation of water. The electron-hole separation enhanced by the core-shell structure of CdS@CdIn2S4 heterojunctions and significantly suppresses the charge recombination, which resulting in greatly enhanced photocatalytic activity for H2O2 production. The resultant catalyst shows an ultra-high H2O2 production rate of 1408.4 mu mol/L in non-sacrificial system, which is about 3.8 times higher than that of pure CdS. This inorganic photocatalysis therefore shows potential as an artificial photosynthesis for H2O2 production by powdered catalysts.