Spinel oxide CoFeO grown on Ni foam as an efficient electrocatalyst for oxygen evolution reaction.

The effect of the oxygen evolution reaction (OER) is important in water splitting. In this work, we develop sphere-like morphology spinel oxide CoFeO/NF by hydrothermal reaction and calcination, and the diameter of the spheres is about 111.1 nm. The CoFeO/NF catalyst exhibits excellent electrocatalytic performance with an overpotential of 273 mV at a current density of 10 mA cm and a Tafel slope of 78 mV dec. The cycling stability of CoFeO/NF is remarkable, and it only increased by 5 mV at a current density of 100 mA cm after 3000 cycles. Therefore, this simple method to prepare CoFeO/NF can enhance the OER properties of electrocatalysts, which makes CoFeO/NF a promising material to replace noble metal-based catalysts for the oxygen evolution reaction.