Concerning the stability of seawater electrolysis: a corrosion mechanism study of halide on Ni-based anode

Sixie Zhang, Yunan Wang, Shuyu Li, Zhongfeng Wang, Haocheng Chen, Li Yi, Xu Chen, Qihao Yang, Wenwen Xu (), Aiying Wang and Zhiyi Lu ()
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Sixie Zhang: Chinese Academy of Sciences
Yunan Wang: Chinese Academy of Sciences
Shuyu Li: University of Chinese Academy of Sciences
Zhongfeng Wang: Chinese Academy of Sciences
Haocheng Chen: Chinese Academy of Sciences
Li Yi: Chinese Academy of Sciences
Xu Chen: Chinese Academy of Sciences
Qihao Yang: Chinese Academy of Sciences
Wenwen Xu: Chinese Academy of Sciences
Aiying Wang: University of Chinese Academy of Sciences
Zhiyi Lu: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The corrosive anions (e.g., Cl−) have been recognized as the origins to cause severe corrosion of anode during seawater electrolysis, while in experiments it is found that natural seawater (~0.41 M Cl−) is usually more corrosive than simulated seawater (~0.5 M Cl−). Here we elucidate that besides Cl−, Br− in seawater is even more harmful to Ni-based anodes because of the inferior corrosion resistance and faster corrosion kinetics in bromide than in chloride. Experimental and simulated results reveal that Cl− corrodes locally to form narrow-deep pits while Br− etches extensively to generate shallow-wide pits, which can be attributed to the fast diffusion kinetics of Cl− and the lower reaction energy of Br− in the passivation layer. Additionally, for the Ni-based electrodes with catalysts (e.g., NiFe-LDH) loading on the surface, Br− causes extensive spalling of the catalyst layer, resulting in rapid performance degradation. This work clearly points out that, in addition to anti-Cl− corrosion, designing anti-Br− corrosion anodes is even more crucial for future application of seawater electrolysis.

Date: 2023
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DOI: 10.1038/s41467-023-40563-9

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