Br−/BrO−-mediated highly efficient photoelectrochemical epoxidation of alkenes on α-Fe2O3

Yukun Zhao, Mengyu Duan, Chaoyuan Deng, Jie Yang, Sipeng Yang, Yuchao Zhang, Hua Sheng, Youji Li, Chuncheng Chen () and Jincai Zhao
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Yukun Zhao: Chinese Academy of Sciences
Mengyu Duan: Chinese Academy of Sciences
Chaoyuan Deng: Chinese Academy of Sciences
Jie Yang: Chinese Academy of Sciences
Sipeng Yang: Chinese Academy of Sciences
Yuchao Zhang: Chinese Academy of Sciences
Hua Sheng: Chinese Academy of Sciences
Youji Li: Jishou University
Chuncheng Chen: Chinese Academy of Sciences
Jincai Zhao: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Epoxides are significant intermediates for the manufacture of pharmaceuticals and epoxy resins. In this study, we develop a Br−/BrO− mediated photoelectrochemical epoxidation system on α-Fe2O3. High selectivity (up to >99%) and faradaic efficiency (up to 82 ± 4%) for the epoxidation of a wide range of alkenes are achieved, with water as oxygen source, which are far beyond the most reported electrochemical and photoelectrochemical epoxidation performances. Further, we can verify that the epoxidation reaction is mediated by Br−/BrO− route, in which Br− is oxidized non-radically to BrO− by an oxygen atom transfer pathway on α-Fe2O3, and the formed BrO− in turn transfers its oxygen atom to the alkenes. The non-radical mediated characteristic and the favorable thermodynamics of the oxygen atom transfer process make the epoxidation reactions very efficient. We believe that this photoelectrochemical Br−/BrO−-mediated epoxidation provides a promising strategy for value-added production of epoxides and hydrogen.

Date: 2023
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DOI: 10.1038/s41467-023-37620-8

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