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

Abstract

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.