Intrinsic Facet‐Dependent Reactivity of Well‐Defined BiOBr Nanosheets on Photocatalytic Water Splitting

Surface atomic arrangement and coordination of photocatalysts highly exposed to different crystal facets significantly affect the photoreactivity. However, controversies on the true photoreactivity of a specific facet in heterogeneous photocatalysis still exits. Herein, we exemplified well‐defined B...

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Published in:Angewandte Chemie International Edition Vol. 59; no. 16; pp. 6590 - 6595
Main Authors: Shi, Ming, Li, Guanna, Li, Jianming, Jin, Xu, Tao, Xiaoping, Zeng, Bin, Pidko, Evgeny A., Li, Rengui, Li, Can
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 16.04.2020
Edition:International ed. in English
Subjects:
BiOBr
Chemical reduction
Exposure
facet-dependency
Hydrogen production
intrinsic reactivity
Nanosheets
Oxidation
Oxygen evolution reactions
Photocatalysis
Photochemicals
Reactivity
Splitting
Water splitting
facet-dependency
BiOBr
water splitting
photocatalysis
intrinsic reactivity
ISSN:1433-7851, 1521-3773, 1521-3773
Online Access:Get full text
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Summary:Surface atomic arrangement and coordination of photocatalysts highly exposed to different crystal facets significantly affect the photoreactivity. However, controversies on the true photoreactivity of a specific facet in heterogeneous photocatalysis still exits. Herein, we exemplified well‐defined BiOBr nanosheets dominating with respective facets, (001) and (010), to track the reactivity of crystal facets for photocatalytic water splitting. The real photoreactivity of BiOBr‐(001) were evidenced to be significantly higher than BiOBr‐(010) for both hydrogen production and oxygen evolution reactions. Further in situ photochemical probing studies verified the distinct reactivity is not only owing to the highly exposed facets, but dominated by the co‐exposing facets, leading to an efficient spatial separation of photogenerated charges and further making the oxidation and reduction reactions separately occur with different reaction rates, which ordains the fate of the true photoreactivity. Intrinsic facet‐dependent photoreactivity: It is demonstrated that the spatial separation of photogenerated charges between top and lateral facets of BiOBr nanosheets dominates the intrinsic facet‐dependent photoreactivity, and not the commonly recognized highly exposed active facets.
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ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.201916510