Nickel–iron foam as a three-dimensional robust oxygen evolution electrode with high activity

In this communication, we report the first use of commercial nickel–iron (NiFe) foam as a novel three-dimensional anode for oxygen evolution reaction in alkaline electrolyte . The NiFe foam electrode exhibits onset overpotential of 300 mV and affords current density of 10 mA cm −2 at an overpotential of 320 mV, with catalytic activity being maintained for at least 10 h. Further acid etching of this electrode leads to greatly enhanced OER activity.