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

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In-Depth Understanding of the Effect of Halogen-Induced Stable 2D Bismuth-Based Perovskites for Photocatalytic Hydrogen Evolution Activity
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-05-19 , DOI: 10.1002/adfm.202201721
Yali Ji ₁ , Mengyao She _{1,

2} , Xue Bai _{1,

3} , Enzhou Liu ₃ , Wenhua Xue ₃ , Zhe Zhang ₁ , Kerou Wan ₄ , Ping Liu ₁ , Shengyong Zhang ₁ , Jianli Li ₁

Affiliation

Halide perovskites are excellent catalysts for photocatalytic hydrogen (H₂) 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 (Cs₃Bi₂X₉ PNs; X = I, Br, Cl) are prepared for H₂ evolution. Small amounts of these halide perovskites possess good stability in ethanol, where the optimal Cs₃Bi₂I₉ PNs exhibit the highest H₂ evolution rate of 2157.8 µmol h⁻¹ g⁻¹. In particular, the effects of halogen regulation on the H₂ evolution activity are investigated in depth from various perspectives for Cs₃Bi₂X₉. 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 H₂ evolution systems for halide perovskites.

中文翻译：

深入了解卤素诱导的稳定二维铋基钙钛矿对光催化析氢活性的影响

_{卤化物钙钛矿是光催化析氢（H 2} ）的优良催化剂；然而，它们在水性体系中的不稳定性限制了它们的应用。在这项研究中，提出了一种替代系统，以避免基于乙醇分解的卤化物钙钛矿电离，并为 H _{2制备了三个基于铋的卤化物钙钛矿纳米片（Cs}₃ Bi ₂ X ₉ PNs；X = I、Br、Cl）。进化。少量这些卤化物钙钛矿在乙醇中具有良好的稳定性，其中最佳的 Cs ₃ Bi ₂ I ₉ PNs 表现出最高的 H ₂释放速率，为 2157.8 µmol h ^-1 g ^-1. 特别是对Cs ₃ Bi ₂ X _{9的卤素调控对H}₂析出活性的影响进行了深入研究。卤原子数量的增加减小了八面体构型中的Bi···Bi距离，消除了电子-空穴对的强局域化，有利于光生电荷的分离和转移。此外，卤素对导带的主要贡献随着卤素原子序数的增加而增强。本研究建立了一种研究铋基钙钛矿以优化其光催化性能的新策略。为开发高效稳定的H _{2提供了新的视角}卤化物钙钛矿的演化系统。

更新日期：2022-05-19

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