Design and Preparation of NiFe₂O₄@FeOOH Composite Electrocatalyst for Highly Efficient and Stable Oxygen Evolution Reaction

Rational design and constructing earth-abundant electrocatalysts for efficient electrocatalytic water splitting is a crucial challenge. Herein, we report a simple and efficient one-step electrochemical synthetic route of the NiFe₂O₄@FeOOH composite electrocatalyst for the oxygen evolution reaction. The unique morphology of the NiFe₂O₄ nanoflowers loaded on FeOOH nanosheets allows more active sites to be exposed and promote charge transfer as well as gas release, and the resulting electrode enables a current density of 10 mA cm^-2 at a low overpotential of 255 mV with outstanding stability at a current density of 100 mA cm^-2 for 300 h.