Dynamic Migration of Ag Efficiently Modulated Electronic Structure and Impressed Chlorine Corrosion of NiFe‐LDH for Seawater Oxidation

Abstract Seawater electrolysis is a promising route for hydrogen production. However, the elevated concentration of Cl − in seawater can cause the serious corrosion of electrode materials, which limits the large‐scale application of seawater splitting for the generation of green hydrogen. Herein, nickel iron layered double hydroxide@Ag/iron foam (NiFe‐LDH@Ag/IF) composites are synthesized using a two‐step method at room temperature. The introduction of Ag not only induces the electron density redistribution of NiFe‐LDH to promote the formation of NiFeOOH as the catalytically active sites, but also impress the corrosion of chloride ions during the seawater oxidation. The as‐prepared NiFe‐LDH@Ag/IF only requires a low overpotential of 255 mV at a current density of 500 mA cm −2 in alkaline solution, and it can stably operate for 1000 h without degradation. Importantly, the formed AgCl nanoparticles loaded on the surface of NiFe‐LDH nanosheets can effectively prevent the corrosive effect of Cl − during the seawater oxidation process. Thus, NiFe‐LDH@Ag/IF can maintain high catalytic activity and work stably for 1000 h at high current density of 500 mA cm −2 for seawater oxidation. This study presents a simple method for preparing self‐supported electrocatalysts with excellent corrosion resistance and high catalytic activity in alkaline seawater oxidation.