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 10mA/cm2 at a low overpotential of 290mV in 0.1M KOH solution with a Tafel slope of 52mV/dec. A higher current density of ∼50mA/cm2 at the same overpotential and a lower Tafel slope of 43mV/dec was obtained for this electrode in 1.0M KOH solution. Excellent durability of the FexNi1−xOy/CP electrode in 1.0M KOH solution was confirmed under a high current density of 136mA/cm2 at an overpotential of 340mV.