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.
Leonchuk et al. (Sun,) studied this question.