Corrosion-resistant NiFe anode towards kilowatt-scale alkaline seawater electrolysis

Xiaogang Sun, Wei Shen, Hao Liu, Pinxian Xi, Mietek Jaroniec, Yao Zheng () and Shi-Zhang Qiao ()
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Xiaogang Sun: The University of Adelaide
Wei Shen: Lanzhou University
Hao Liu: The University of Adelaide
Pinxian Xi: Lanzhou University
Mietek Jaroniec: Kent State University
Yao Zheng: The University of Adelaide
Shi-Zhang Qiao: The University of Adelaide

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Development of large-scale alkaline seawater electrolysis requires robust and corrosion-resistant anodes. Here we propose engineering NiFe layered double hydroxide (LDH)-based anodes by incorporating a series of anions into the LDH interlayers. The most optimal NiFe LDH anode with intercalated phosphates demonstrates stable operation at a high current density of 1.0 A cm−2 for over 1000 hours in a 2 W-scale alkaline seawater electrolyzer (ASWE). Fundamental studies indicate that the basicity, indicated by pKa values, of the intercalated anions in NiFe LDH governs its oxygen evolution reaction activity and corrosion resistance. Highly basic anions (i.e., phosphates) securely anchor Fe sites and facilitate proton transfer to boost both durability and activity. Notably, we demonstrate the proof-of-concept for the NiFe anode in an industrial 1 kW-scale ASWE stack (1,081.2 cm2 anode area in total). This unit achieves a stable operating current density of 0.5 A cm−2 at about 2.0 V, twice that of the commercial alkaline pure water electrolyzer, contributing to an economically competitive hydrogen production cost of US$ 1.96 kgH2−1.

Date: 2024
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DOI: 10.1038/s41467-024-54754-5

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