卤化物
卤素
钙钛矿(结构)
材料科学
光催化
铋
水溶液
卤化氢
八面体
催化作用
化学物理
分解水
无机化学
光化学
物理化学
结晶学
晶体结构
化学
有机化学
烷基
冶金
作者
Yali Ji,Mengyao She,Xue Bai,Enzhou Liu,Weilan Xue,Zhe Zhang,Kerou Wan,Ping Liu,Shengyong Zhang,Jian Li Li
标识
DOI:10.1002/adfm.202201721
摘要
Abstract Halide perovskites are excellent catalysts for photocatalytic hydrogen (H 2 ) evolution; however, their instability in aqueous systems limits their applications. In this study, an alternative system is presented to avoid the ionization of halide perovskites based on ethanol splitting and three Bi‐based halide perovskite nanosheets (Cs 3 Bi 2 X 9 PNs; X = I, Br, Cl) are prepared for H 2 evolution. Small amounts of these halide perovskites possess good stability in ethanol, where the optimal Cs 3 Bi 2 I 9 PNs exhibit the highest H 2 evolution rate of 2157.8 µmol h −1 g −1 . In particular, the effects of halogen regulation on the H 2 evolution activity are investigated in depth from various perspectives for Cs 3 Bi 2 X 9 . The increased number of halogen atoms reduces the Bi···Bi distance in the octahedral configuration and eliminates the strong localization of electron–hole pairs, which are conducive to photogenerated charge separation and transfer. In addition, the dominant contribution of halogens to the conduction band is enhanced with an increase in the halogen atomic number. This study establishes a novel strategy for studying Bi‐based perovskites for optimizing their photocatalytic properties. Furthermore, it provides a new perspective for developing highly efficient and stable H 2 evolution systems for halide perovskites.
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