Based on Z-scheme heterojunction CsPbBr3/UiO-66 composite photocatalytic degradation

As an environmentally friendly technology, photocatalysis technology has great application prospects in the fields of photoelectric energy and environmental pollutants treatment, and its core is photocatalyst. In recent years, perovskite materials with a narrow band gap, high quantum efficiency, and high carrier mobility have been widely concerned to use as photocatalysts. However, as to a single perovskite, the electron-hole separation rate is still low. In this paper, CsPbBr3/UiO-66 composite photocatalyst was prepared based on a heterojunction strategy. CsPbBr3/UiO-66 photocatalyst has excellent photocatalytic performance: The degradation rate of methyl orange (MO) in aqueous solution is more than 90% in 90 min, which is much higher than that of original CsPbBr3 (57.7% in 90 min). Based on various characterization techniques, our study verified the formation of a Z-scheme heterojunction between CsPbBr3 and UiO-66. At the same time, the improved photocatalytic performance of CsPbBr3/UiO-66 is due to the efficient Z-scheme charge migration mechanism in CsPbBr3/UiO-66. This work is expected to provide a new opportunity to regulate the photocatalytic performance of perovskite by heterojunction strategy.

Automated summary

Photocatalysis technology, as an environmentally friendly technology, has great potential in the fields of photoelectric energy and environmental pollutants treatment. Perovskite materials, with narrow band gap, high quantum efficiency, and high carrier mobility, have attracted much attention as photocatalysts. However, the electron-hole separation rate for a single perovskite is still low. In this study, a CsPbBr3/UiO-66 composite photocatalyst was prepared using a heterojunction strategy, which exhibited excellent photocatalytic performance due to the efficient Z-scheme charge migration mechanism.