Synthesis of CsPbBr3/CsPb2Br5@silica yolk-shell composite microspheres: precisely controllable structure and improved catalytic activity for dye degradation
- Resource Type
- Original Paper
- Authors
- Xie, Kehan; Wei, Shijing; Alhadhrami, A.; Liu, Jie; Zhang, Putao; Elnaggar, Ashraf Y.; Zhang, Feng; Mahmoud, M. H. H.; Murugadoss, Vignesh; El-Bahy, Salah M.; Wang, Feijiu; Li, Chao; Li, Guoqiang
- Source
- Advanced Composites and Hybrid Materials. 5(2):1423-1432
- Subject
- CsPbBr3
CsPb2Br5 heterostructure
Composition modulation
Yolk-shell microspheres
Photocatalysis
Charge separation
Water-based system catalysis
- Language
- English
- ISSN
- 2522-0128
2522-0136
Heterogeneous metal halide perovskites (MHPs) are of great interest in photovoltaic and photocatalytic applications because of their high photon-to-electron conversion efficiency. However, the improvement in the stability of heterogeneous MHP is still a great challenge and has rarely been reported for polar solvent–based photocatalytic applications. Herein, we report a precisely controllable synthesis of CsPbBr3/CsPb2Br5 heterogeneous crystals into mesoporous hollow SiO2 spheres to form the CsPbBr3/CsPb2Br5@SiO2 yolk-shell microspheres. The composition modulation by simply adjusting the ratio of Cs+ and Pb2+ could result in the perovskite structure evolution from CsPbBr3 to CsPbBr3/CsPb2Br5 and CsPb2Br5. The prepared CsPbBr3/CsPb2Br5@SiO2 were dispersed in the aqueous rhodamine B solutions and exhibited higher photocatalytic activities than the commercial TiO2 (P25). The improvement in the photocatalytic efficiency is mainly caused by the formation of heterogeneous CsPbBr3/CsPb2Br5 to boost the spatial charge separation efficiency.Graphical abstract: