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Unprecedented Eighteen‐Faceted BiOCl with a Ternary Facet Junction Boosting Cascade Charge Flow and Photo‐redox

2019; Wiley; Volume: 58; Issue: 28 Linguagem: Inglês

10.1002/anie.201904921

1521-3773

Min Li, Shixin Yu, Hongwei Huang, Xiaowei Li, Yibo Feng, Cong Wang, Yonggang Wang, Tianyi Ma, Lin Guo, Yihe Zhang,

Covalent Organic Framework Applications

Exposure of anisotropic crystal facets allows the directional transfer of photoexcited electrons (e- ) and holes (h+ ), for spatial charge separation. High-index facets with a high density of low-coordinated atoms always serve as reactive catalytic sites. However, preparation of multi-facets or high-index facets is highly challenging for layered bismuth-based photocatalysts. Herein, we report the preparation of unprecedented eighteen-faceted BiOCl with {001} top facets and {102} and {112} oblique facets via a hydrothermal process. Compared to the conventional BiOCl square plates with {001} top facets and {110} lateral facets, the eighteen-faceted BiOCl has highly enhanced photocatalytic activity for H2 evolution and hydroxyl radicals (. OH) production. Theoretical calculations and photodeposition results disclose that the of eighteen-faceted BiOCl has a well-matched {001}/{102}/{112} ternary facet junction, which provides a cascade path for more efficient charge flow than the binary facet junction in BiOCl square plates.