An iron-base oxygen-evolution electrode for high-temperature electrolyzers

Kaifa Du, Enlai Gao, Chunbo Zhang, Yongsong Ma, Peilin Wang, Rui Yu, Wenmiao Li, Kaiyuan Zheng, Xinhua Cheng, Diyong Tang, Bowen Deng, Huayi Yin () and Dihua Wang ()
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Kaifa Du: Wuhan University
Enlai Gao: Wuhan University
Chunbo Zhang: Wuhan University
Yongsong Ma: Wuhan University
Peilin Wang: Wuhan University
Rui Yu: Wuhan University
Wenmiao Li: Wuhan University
Kaiyuan Zheng: Wuhan University
Xinhua Cheng: Wuhan University
Diyong Tang: Wuhan University
Bowen Deng: Wuhan University
Huayi Yin: Wuhan University
Dihua Wang: Wuhan University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract High-temperature molten-salt electrolyzers play a central role in metals, materials and chemicals production for their merit of favorable kinetics. However, a low-cost, long-lasting, and efficient high-temperature oxygen evolution reaction (HT-OER) electrode remains a big challenge. Here we report an iron-base electrode with an in situ formed lithium ferrite scale that provides enhanced stability and catalytic activity in both high-temperature molten carbonate and chloride salts. The finding is stemmed from a discovery of the ionic potential-stability relationship and a basicity modulation principle of oxide films in molten salt. Using the iron-base electrode, we build a kiloampere-scale molten carbonate electrolyzer to efficiently convert CO2 to carbon and oxygen. More broadly, the design principles lay the foundations for exploring cheap, Earth-abundant, and long-lasting HT-OER electrodes for electrochemical devices with molten carbonate and chloride electrolytes.

Date: 2023
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DOI: 10.1038/s41467-023-35904-7

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