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

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 a...

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Bibliographic Details
Published in:Nature communications 2023-01, Vol.14 (1), p.253-253, Article 253
Main Authors: Du, Kaifa, Gao, Enlai, Zhang, Chunbo, Ma, Yongsong, Wang, Peilin, Yu, Rui, Li, Wenmiao, Zheng, Kaiyuan, Cheng, Xinhua, Tang, Diyong, Deng, Bowen, Yin, Huayi, Wang, Dihua
Format: Article
Language:English
Subjects:
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Basicity
Carbon dioxide
Catalytic activity
Chlorides
Electrochemistry
Electrodes
Electrolysis
Electrolytes
Evolution
Heavy metals
High temperature
Humanities and Social Sciences
Iron
Lithium
Lithium ferrite
Low cost
Molten salts
multidisciplinary
Oxide coatings
Oxygen
Oxygen evolution reactions
Principles
Science
Science (multidisciplinary)
Stability
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Summary: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 CO 2 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. A low-cost and efficient high-temperature oxygen evolution reaction electrode is a big challenge. Here, the authors report an iron-base electrode with an in situ formed lithium ferrite for enhanced stability and catalytic activity in molten carbonate and chloride salts and achieve kiloampere-scale electrolysis.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-35904-7