Synthesis of CsPbBr3/CsPb2Br5@silica yolk-shell composite microspheres: precisely controllable structure and improved catalytic activity for dye degradation

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 f...

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Published in:Advanced composites and hybrid materials 2022-06, Vol.5 (2), p.1423-1432
Main 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
Format: Article
Language:English
Subjects:
Ceramics
Chemistry and Materials Science
Composites
Glass
Materials Engineering
Materials Science
Natural Materials
Original Research
Polymer Sciences
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Summary: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 CsPbBr 3 /CsPb 2 Br 5 heterogeneous crystals into mesoporous hollow SiO 2 spheres to form the CsPbBr 3 /CsPb 2 Br 5 @SiO 2 yolk-shell microspheres. The composition modulation by simply adjusting the ratio of Cs + and Pb 2+ could result in the perovskite structure evolution from CsPbBr 3 to CsPbBr 3 /CsPb 2 Br 5 and CsPb 2 Br 5 . The prepared CsPbBr 3 /CsPb 2 Br 5 @SiO 2 were dispersed in the aqueous rhodamine B solutions and exhibited higher photocatalytic activities than the commercial TiO 2 (P25). The improvement in the photocatalytic efficiency is mainly caused by the formation of heterogeneous CsPbBr 3 /CsPb 2 Br 5 to boost the spatial charge separation efficiency. Graphical abstract
ISSN:2522-0128
2522-0136
DOI:10.1007/s42114-022-00520-4