Highly efficient FexNi1-xOy/CP electrode prepared via simple soaking and heating treatments for electrocatalytic water oxidation

摘要

The oxygen evolution reaction (OER) is a key step in the overall water splitting process.Numerous electrocatalysts have been developed to lower the overpotential and accelerate the kinetics of the OER.In this work,a simple soaking and heating treatment was used to form a stable and efficient FexNi1-xOy/CP electrode.The electrode combined nickel and iron oxides on a commercial carbon paper were used for electrocatalytic water oxidation.The best FexNi1-xOy/CP electrode (Ni/Fe =15/1) displayed a current density of 10 mA/cm2 at a low overpotential of 290 mV in 0.1 M KOH solution with a Tafel slope of 52 mV/dec.A higher current density of ～50 mA/cm2 at the same overpotential and a lower Tafel slope of 43 mV/dec was obtained for this electrode in 1.0 M KOH solution.Excellent durability of the FexNi1-xOy/CP electrode in 1.0 M KOH solution was confirmed under a high current density of 136 mA/cm2 at an overpotential of 340 mV.