Hexafluoroantimonate intercalated NiFe layered double hydroxide enables stable alkaline seawater oxidation at ampere-level current densities

Abstract

Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions. However, the high concentration of chloride ions (Cl−) in seawater triggers competitive chemical reactions and severe corrosion, posing a challenge to the durability of the anode. In this study, we present a hexafluoroantimonate-intercalated NiFe layered double hydroxide nanosheet array on Ni foam (SbF6−-NiFe LDH/NF), which serves as a highly active and stable electrocatalyst for alkaline seawater oxidation (ASO). SbF6−-NiFe LDH/NF requires only an overpotential of 379 mV to achieve a current density of 1000 mA cm−2, significantly outperforming NiFe LDH/NF (396 mV). Furthermore, it exhibited excellent long-term stability over 600 hours at 1000 mA cm−2, with only trace amounts of active chlorine detected during the ASO process. In situ Raman spectroscopy confirms that the insertion of SbF6− into the LDH layers promotes the formation of active sites. More importantly, SbF6− efficiently repels Cl−, thus providing robust protection to the anode. This development represents a significant advancement in the design of noble-metal-free, durable anode electrodes for ASO.

Supplementary files

Article information

Article type
Research Article
Submitted
14 Nov 2024
Accepted
17 Apr 2025
First published
03 Jun 2025

Inorg. Chem. Front., 2025, Accepted Manuscript

Hexafluoroantimonate intercalated NiFe layered double hydroxide enables stable alkaline seawater oxidation at ampere-level current densities

Q. Dai, Z. Cai, C. Yang, Z. Li, S. Sun, Y. Meng, X. Tang, X. He, Y. Yuan, H. tang, Y. Yao, D. Zheng, Y. Luo, M. S. Hamdy, F. A. Ibrahim, T. Li, X. Sun and B. Tang, Inorg. Chem. Front., 2025, Accepted Manuscript , DOI: 10.1039/D4QI02892A

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