Heterojunction-Type Photocatalytic System Based on Inorganic Halide Perovskite CsPbBr3

Enbo Zhu, Yizhou Zhao, Yi Dai, Qiuhe Wang, Yuanyuan Dong, Qi Chen, Yujing Li*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

21 引用 (Scopus)

摘要

The heterojunction-type structure has shown significant merits in tuning the optical properties and carrier physics. Inspired by the excellent absorption capability of halide perovskite materials for visible light, a series of CsPbBr3/TiO2 heterojunction-type photocatalysts with various all-inorganic-perovskite/TiO2 ratios are successfully fabricated by the ligand-assisted reprecipitation (LARP) method. The heterojunction structure extends the light absorption of TiO2 with good chemical and structural stability. A Pb-O interaction at the CsPbBr3/TiO2 interface is observed by the XPS and confirmed by the TRPL showing improved interface carrier transport and stability. The heterojunction-type catalyst shows drastically enhanced photocatalytic activity towards the direct oxidation of toluene with O2 molecule, as an important reaction for organic chemical synthesis. The optimized sample shows an activity of 2356 μmol·g–1·h–1 at 75 °C, 4 times of that of the naked CsPbBr3 nanocrystals, and 3 times of that of the bare TiO2. Based on the investigation with trapping agents, a reaction mechanism is hence proposed suggesting that the photo-generated hole may be involved in the rate-limiting step. This work demonstrates the potential of inorganic halide perovskite-based heterojunction structure for photocatalytic applications.

源语言英语
页(从-至)1718-1722
页数5
期刊Chinese Journal of Chemistry
38
12
DOI
出版状态已出版 - 12月 2020

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