Nitrate-coordinated FeNi(OH)2 for hydrazine oxidation assisted seawater splitting at the industrial-level current density

Abstract

In this study, we developed a nitrate-coordinated iron–nickel hydroxide [N_C–FeNi(OH)₂] catalyst for hydrazine oxidation-assisted seawater splitting. Replacement of O₂ evolution by hydrazine oxidation in a two-electrode setup resulted in a cell voltage of 1.20 V at 100 mA cm⁻². This represents a voltage reduction of 470 mV compared to conventional seawater splitting. Additionally, N_C–FeNi(OH)₂ demonstrated remarkable stability over a period of 60 hours.