Liquid NaK‐Enabled Strategy for the Facile and Scalable Synthesis of Porous Fe/Co/Ni‐Based Materials for Magnetically Enhanced OER Catalysis

ABSTRACT The advancement of water electrolysis is hindered by the scarcity of electrocatalysts that integrate high activity, rapid mass transport, and energy‐efficient operation modes. We address this challenge via a versatile room‐temperature synthesis using a liquid NaK alloy as a dual‐function reagent to fabricate porous, multiphase Fe/Co/Ni‐based magnetic electrocatalysts. This method eliminates high‐temperature calcination and toxic etchants, enabling facile scaling with yields > 80% and efficient solvent recovery. The resulting amorphous materials feature mesoporosity (up to 101 m 2 /g) and a synergistic mix of metallic and oxide phases. They demonstrate exceptional oxygen evolution reaction (OER) performance, with the Fe‐Co‐based catalyst achieving a low overpotential of 243 mV at 10 mA/cm 2 with a Tafel slope of 57 mV/dec and a high current density of 20 mA/cm 2 ·mg under an external magnetic field (250 mT). Crucially, the amorphous structure outperforms its crystalline counterpart, and the performance enhancement under a magnetic field is primarily driven by magnetohydrodynamic effects amplified by the material's porous architecture. This work establishes a sustainable platform for designing next‐generation electrocatalysts where structural complexity is engineered to overcome intrinsic limitations in energy conversion.