Porous Monolithic Electrode of Ni₃FeN on 3D Graphene for Efficient Oxygen Evolution

Developing high-performance nonprecious electrocatalysts for oxygen evolution reaction (OER) is of great importance, but it remains a challenge. In this paper, we synthesize a porous monolithic catalytic electrode, which is transition metal nitride, Ni₃FeN, constructed on a 3D network-like support of the strutted graphene foam (Ni₃FeN/SG). The obtained Ni₃FeN/SG electrode shows the excellent catalytic activity and the durability for OER in alkaline solution, owing to iron incorporation, high electrical conductivity and 3D network-like structure of strutted graphene. It requires small overpotential (226 mV) to actuate 10 mA cm^-2, superior to most recently developed catalysts and commercial RuO₂. The fabrication strategy provides a substantial way to expand 3D porous monolithic electrodes for various electrocatalytic applications.