Perovskite Cs3Bi2I9 Hexagonal Prisms with Ordered Geometry for Enhanced Photocatalytic Hydrogen Evolution

被引：28

作者：

Li, Mingjie ^{[1
]}

Xu, Shuang ^{[1
]}

Wu, Liqin ^{[1
]}

Tang, Huiling ^{[1
]}

Zhou, Biao ^{[1
]}

Xu, Jie ^{[1
]}

Yang, Qi ^{[1
]}

Zhou, Ting ^{[1
]}

Qiu, Yongcai ^{[1
]}

Chen, Guangxu ^{[1
]}

Waterhouse, Geoffrey I. N. ^{[2
]}

Yan, Keyou ^{[1
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Solid Wastes Pollut Contro, Guangzhou 510000, Peoples R China

[2] Univ Auckland, Sch Chem Sci, Auckland 1142, New Zealand

来源：

ACS ENERGY LETTERS | 2022年 / 7卷 / 10期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

H-2; EVOLUTION; EFFICIENT; CRYSTALS; FACETS;

D O I：

10.1021/acsenergylett.2c01856

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis of metal halide perovskite/perovskitoid (MHP) photocatalysts with well-defined morphologies and facet-specific redox activity is technically challenging. Herein, using surfactants to control the arrangement of 0D facet-shared [Bi2I9](3-) dioctahedra building blocks, we successfully fabricated ordered perovskite Cs3Bi2I9 hexagonal prisms (CBI-HPs). Using Co2+ oxidation and PT4+ reduction as redox probes, photoexcited holes were shown to spatially migrate to the edge (100) facets while photoexcited electrons migrated to the (006) basal facets, respectively. Density functional theory revealed that the built-in potential of the facet junction between (100) and (006) facets was similar to 130 meV. Because of the well-separated redox facets, the photocatalytic hydrogen evolution rate of ordered CBI-HPs via hydroiodic acid splitting reached 1504.5 mu mol/h/g, which is 22.1 times that of a disordered CBI photocatalyst. This work guides the rational design of high-performance MHP photocatalysts for solar energy conversion and other applications.

引用

页码：3370 / 3377

页数：8

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