Two-Step Electrochemical Oxidation Enables Synergistic Fe³⁺ Doping and PO₄³⁻ Modification of Nickel-Based Catalysts for Efficient Oxygen Evolution

Abstract

A two-step electrochemical oxidation strategy is developed to fabricate (Fe³⁺,PO₄³⁻)-Ni(OH)₂/NiOOH catalyst on a commercial nickel mesh with the optimal ratio of 0.1 mmol/L Fe³⁺ and 5 mmol/L PO₄³⁻ for alkaline OER. It delivers significantly boosted OER activity and robust 20-hour long-term cycling stability, offering a facile avenue for electrocatalyst design.