Ultra-stable seawater oxidation at 1.5 A cm−2 enabled by heptafluorotantalate intercalated NiFe layered double hydroxide

Seawater electrolysis is a facile, economical, and ecologically friendly approach for large-scale hydrogen production. However, the presence of chloride ions (Cl − ) in seawater can cause severe anode corrosion, which hinders its further application. Herein, a heptafluorotantalate (TaF 7 2− ) intercalated NiFe layered double hydroxide on Ni foam (TF-NiFe LDH/NF) is proposed for efficient and durable alkaline seawater oxidation (ASO). Such TF-NiFe LDH/NF requires an overpotential of only 375 mV to achieve a current density ( j ) of 1 A cm −2 and maintains stable operation for 1000 h at a j of 1.5 A cm −2 . In situ Raman characterization and stability tests indicate that TaF 7 2− can not only facilitate the dynamic reconstruction process of the catalyst but also effectively repels Cl − at ampere-level j . This study highlights a novel anion (TaF 7 2− ) intercalation strategy, providing new insights into the design of efficient and stable electrocatalysts, thus offering a new approach to enhance corrosion resistance for ASO.