Durable Ampere-Scale Seawater Electrolysis Driven by Ba-Doped NiFe Layered Double Hydroxide

Direct seawater electrolysis is promising for green hydrogen production from earth’s most abundant water resource, but its anode suffers from chloride-induced corrosion. Herein, Ba-doped NiFe layered double hydroxide supported on Ni foam (Ba-NiFe LDH/NF) is demonstrated as a high-performance anode for durable alkaline seawater oxidation. Such Ba-NiFe LDH/NF needs only an overpotential of 342 mV to achieve 1000 mA cm–2 and operates stably for 1500 h with negligible degradation and minimal active chlorine generation. Ba doping not only accelerates catalyst surface reconstruction but also favors the selective adsorption of OH– vs Cl– over the anode. The membrane electrode assembly electrolyzer composed of Ba-NiFe LDH/NF and Pt/C/NF demonstrates stable operation at 1000 mA cm–2 for 500 h.