Modifying CsPbX₃ (X = Cl, Br, I) with a Zeolitic Imidazolate Framework through Mechanical Milling for Aqueous Photocatalytic H₂ Evolution

Abstract

All-inorganic perovskite nanocrystals (CsPbX3, X = Cl, Br, and I) have attracted increasing attention in various fields due to their unique optoelectronic properties. However, the vulnerable structure of CsPbX3 in aqueous solutions severely limits its further application in diverse fields. Although many protocols have been developed, the synthesis of all-inorganic CsPbX3 nanocrystals in a large-scale and environment-friendly manner remains a significant challenge. Here, we demonstrate a facile strategy for modifying CsPbX3 with a zeolitic imidazolate framework (ZIF-8) through mechanical milling, which can be used for the large-scale synthesis of CsPbX3@ZIF-8 composites. More importantly, the as-prepared composites display superior stability, and the photoluminescence (PL) intensity remains ∼86.7% after 8 weeks. Detailed characterizations indicate that the synergy in the composites can significantly facilitate the separation of photoinduced electrons and holes, leading to an increase in the photocurrent intensity. For photocatalytic H2 evolution under visible light, the optimal CsPbBr3@ZIF-8 composite exhibits a H2 productivity of 19.63 μmol·g–1 H2 after 2.5 h, thus proving to be a promising catalyst for photocatalytic H2 evolution under visible light in aqueous solutions. This work may not only provide a facile strategy for the modification of CsPbX3 nanocrystals but also promotes their practical applications in diverse fields.

Near-infrared multiphoton absorption and third harmonic generation with CsPbBr3 quantum dots embedded in micro-particles of metal–organic frameworks

“…30 It is obvious that the fluorescence lifetime is improved after compounding, which may result from the surface passivation, 16 or the separation of photoinduced electrons and holes by the introduction of ZIF-8. 31 With the excitation of infrared femto-second laser pulses at wavelengths from 1000 to 2200 nm, CsPbBr 3 @ZIF-8 exhibits strong MPEPL. The details of the experimental setup are shown in Fig.…”

“…30 It is obvious that the fluorescence lifetime is improved after compounding, which may result from the surface passivation, 16 or the separation of photoinduced electrons and holes by the introduction of ZIF-8. 31…”

Recent progress in metal halide perovskite photocatalysts for hydrogen evolution

“…10d), 131 The MoS 2 edges offered large amounts of unsaturated S 2 2À that could be considered as active sites for HER. 163,164 135 Copyright 2022 American Chemical Society.…”

Research Progress on Photocatalytic Reduction of CO2 Based on CsPbBr3 Perovskite Materials

“…CsPbX 3 is the most widely used inorganic metal halide perovskite materials, such as solar cells, [71] photodetectors, [72] photocatalytic applications, [38,73] etc. CsPbX 3 has begun to explore the application of photocatalysis, and CsPbBr 3 perovskite has been widely used in the field of photocatalytic reduction of CO 2 .…”