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

Ming Shi, Guanna Li, Jianming Li, Xu Jin, Xiaoping Tao, Bin Zeng, Evgeny A. Pidko, Rengui Li, Can Li

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)6590-6595
Number of pages6
JournalAngewandte Chemie - International Edition
Volume59
Issue number16
DOIs
Publication statusPublished - 2020

Keywords

  • BiOBr
  • facet-dependency
  • intrinsic reactivity
  • photocatalysis
  • water splitting

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