Spatial decoupling of bromide-mediated process boosts propylene oxide electrosynthesis

Mingfang Chi, Jingwen Ke, Yan Liu, Miaojin Wei, Hongliang Li, Jiankang Zhao, Yuxuan Zhou, Zhenhua Gu, Zhigang Geng () and Jie Zeng ()
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Mingfang Chi: University of Science and Technology of China
Jingwen Ke: University of Science and Technology of China
Yan Liu: University of Science and Technology of China
Miaojin Wei: University of Science and Technology of China
Hongliang Li: University of Science and Technology of China
Jiankang Zhao: University of Science and Technology of China
Yuxuan Zhou: University of Science and Technology of China
Zhenhua Gu: University of Science and Technology of China
Zhigang Geng: University of Science and Technology of China
Jie Zeng: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract The electrochemical synthesis of propylene oxide is far from practical application due to the limited performance (including activity, stability, and selectivity). In this work, we spatially decouple the bromide-mediated process to avoid direct contact between the anode and propylene, where bromine is generated at the anode and then transferred into an independent reactor to react with propylene. This strategy effectively prevents the side reactions and eliminates the interference to stability caused by massive alkene input and vigorously stirred electrolytes. As expected, the selectivity for propylene oxide reaches above 99.9% with a remarkable Faradaic efficiency of 91% and stability of 750-h (>30 days). When the electrode area is scaled up to 25 cm2, 262 g of pure propylene oxide is obtained after 50-h continuous electrolysis at 6.25 A. These findings demonstrate that the electrochemical bromohydrin route represents a viable alternative for the manufacture of epoxides.

Date: 2024
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DOI: 10.1038/s41467-024-48070-1

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