In-Depth Understanding of the Effect of Halogen-Induced Stable 2D Bismuth-Based Perovskites for Photocatalytic Hydrogen Evolution Activity

Yali Ji; Mengyao She; Xue BaiEnzhou LiuWenhua XueZhe ZhangKerou WanPing LiuShengyong ZhangJianli Li

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In-Depth Understanding of the Effect of Halogen-Induced Stable 2D Bismuth-Based Perovskites for Photocatalytic Hydrogen Evolution Activity

机译：In-Depth Understanding of the Effect of Halogen-Induced Stable 2D Bismuth-Based Perovskites for Photocatalytic Hydrogen Evolution Activity

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Halide perovskites are excellent catalysts for photocatalytic hydrogen (H_2) evolution;however, their instability in aqueous systems limits their applications. Inthis study, an alternative system is presented to avoid the ionization of halideperovskites based on ethanol splitting and three Bi-based halide perovskitenanosheets (Cs_3Bi_2X_9 PNs; X = I, Br, Cl) are prepared for H_2 evolution. Smallamounts of these halide perovskites possess good stability in ethanol, where theoptimal Cs_3Bi_2I_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 areinvestigated in depth from various perspectives for Cs_3Bi_2X_9. The increasednumber of halogen atoms reduces the Bi···Bi distance in the octahedral configurationand eliminates the strong localization of electron–hole pairs, which areconducive to photogenerated charge separation and transfer. In addition, thedominant contribution of halogens to the conduction band is enhanced with anincrease in the halogen atomic number. This study establishes a novel strategyfor studying Bi-based perovskites for optimizing their photocatalytic properties.Furthermore, it provides a new perspective for developing highly efficient andstable H_2 evolution systems for halide perovskites.

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《Advanced functional materials》 |2022年第31期|2201721.1-2201721.9|共9页
作者
Yali Ji; Mengyao She; Xue BaiEnzhou LiuWenhua XueZhe ZhangKerou WanPing LiuShengyong ZhangJianli Li;
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Ministry of Education Key Laboratory of Synthetic and NaturalFunctional Molecule ChemistryCollege of Chemistry & Materials ScienceNorthwest UniversityXi’an 710127, P. R. China,Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry o;

Ministry of Education Key Laboratory of Synthetic and NaturalFunctional Molecule ChemistryCollege of Chemistry & Materials ScienceNorthwest UniversityXi’an 710127, P. R. China,School of Chemical EngineeringNorthwest UniversityXi’an 710127, P. R. China;

School of Chemical EngineeringNorthwest UniversityXi’an 710127, P. R. ChinaMinistry of Education Key Laboratory of Synthetic and NaturalFunctional Molecule ChemistryCollege of Chemistry & Materials ScienceNorthwest UniversityXi’an 710127, P. R. ChinaKey Laboratory of Catalytic Materials and Technology of Shaanxi ProvinceKaili Catalyst & New Materials Co., LtdXi’an 710201, P. R. China;

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Cs_3Bi_2X_9; Bi-based halide perovskites; hydrogen evolution; nanosheets; photocatalysis;

In-Depth Understanding of the Effect of Halogen-Induced Stable 2D Bismuth-Based Perovskites for Photocatalytic Hydrogen Evolution Activity

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