A Single-Atom Au Catalyst Boosts High-Efficiency Electrochemical Seawater Oxidation

Alkaline seawater electrolysis has garnered significant attention as an efficient, green, and sustainable method for producing green hydrogen in recent years. However, the lack of highly active anodes in seawater electrolysis to prevent chloride oxidation reactions has limited its commercial application. In this study, Au single atoms were deposited on NiCoFeS through the electrochemical deposition method. The optimized catalyst exhibited significantly enhanced activity in seawater electrolyte; the Au@NiCoFeS catalyst achieved a current density of 10 mA/cm2 with only 183 mV and maintained its performance without degradation for 250 h at a current density of 200 mA/cm2, with no corrosion observed on either the catalyst or the substrate.