Strong Magnetic Field‐Enhanced Corrosion Engineering Unlocks Integrated Amorphous/Crystalline Bifunctional Electrodes for Stable High‐Current Water Electrolysis

Abstract Developing durable and efficient bifunctional electrocatalysts is crucial for advancing large‐scale hydrogen production via water splitting. Here, a strong magnetic field (SMF)‐enhanced corrosion engineering strategy is utilized to construct an integrated bifunctional electrode featuring an amorphous nickel sulfide/crystalline hydroxide heterostructure (NF@FS‐6T). The SMF significantly accelerates sulfurization and corrosion processes through magnetohydrodynamic effects without applying an external electric field, facilitating the in situ formation of abundant amorphous sulfides and more heterointerfaces. These modifications optimally adjust the electronic energy band structure, improve charge transfer efficiency, and lower the reaction energy barriers for both hydrogen and oxygen evolution reactions (HER, OER). This SMF effect reduces HER overpotential from 346 to 228 mV, OER overpotential from 394 to 328 mV, and water splitting voltage from 1.974 to 1.741 V at 500 mA cm −2 in 1 m KOH. The integrated structural design renders NF@FS‐6T exceptional electrochemical stability for over 1200 h at 500 mA cm −2 during HER, OER, and water splitting. This work highlights the essential role of SMF in enhancing corrosion engineering for designing efficient and durable industrial‐grade bifunctional electrocatalysts.