Readily Available Stable Nonquantum Dot CsPbBr3/TiO2 Heterostructure Crystals for Efficient Photocatalyst

The application of perovskites in the field of photocatalyst has been greatly limited due to their poor stability. Herein, the easy‐to‐prepare CsPbBr 3 /TiO 2 heterostructure nanocrystals are employed as photocatalysts. The results confirm that the strong interfacial connection and efficient charge separation can be observed in CsPbBr 3 /TiO 2 heterostructure crystals by natural crystal growth. Consequently, the generation of superoxide radicals, which is beneficial for the photocatalytic properties, is obviously increased. The CsPbBr 3 /TiO 2 heterostructure nanocrystals completely degrade Rhodamine B in just 4 min. In addition, it is also found that the nonquantum dot CsPbBr 3 crystals can be naturally encapsulated by the stable and compact TiO 2 nanoparticles without complex synthesis process, which finally provides an excellent protection for the stability of CsPbBr 3 perovskite. The CsPbBr 3 /TiO 2 heterostructure nanocrystals can exhibit almost no degradation of photocatalytic performance exceeding 8 months in oceanic climate (10 °C ≤ T ≤ 32 °C, 20% ≤ RH ≤ 100%), showing a remarkable stability.