Electrodeposition of amorphous CoFe oxide/hydroxide onto nickel mesh as a highly efficient electrocatalyst for the oxygen evolution reaction

Abstract

The rational design of an efficient and stable electrocatalyst is the key to driving the oxygen evolution reaction (OER) in water electrolysis. Herein, we synthesized the CoFe/Ni/NM electrode in the amorphous/crystalline phase on a nickel mesh using an electrodeposition method. The prepared CoFe/Ni/NM electrode has a rich pore structure, and the overpotentials required to generate current densities of 10 mA cm−2 and 100 mA cm−2 were 235 mV and 361 mV in 1.0 M KOH, respectively, exhibiting excellent OER-catalytic activity with stability over 72 h. To simulate industrial production, we have tested the cell Ni/NM || CoFe/Ni/NM for overall electrolysis in 6.0 M KOH, which display a current density of 879 mA cm−2 at 90 °C and 2 V.