There remains a challenge in designing electrocatalysts for water oxidation to create highly efficient catalytic sites for the oxygen evolution reaction (OER) while maintaining their robustness at large outputs. Herein, an etching-assisted synthesis approach was developed to integrate highly active NiFe₂O₄ nanoparticles with a robust and active NiOOH scaffold directly on commercial stainless steel. A precise selenization strategy was then introduced to achieve selective Se doping of NiFe₂O₄ to further enhance its intrinsic OER activity while maintaining a three-dimensional NiOOH nanosheet array as a robust scaffold for prompt mass transfer and gas evolution. The resulting NiFe₂O_4−xSe_x/NiOOH electrode exhibited superior electrocatalytic activity with low overpotentials of 153 and 259 mV to deliver benchmark current densities of 10 and 500 mA cm⁻², respectively. More importantly, the catalyst exhibited remarkable durability at a stable current output of 100 mA cm⁻² for hundreds of hours. These findings may open up opportunities for exploring efficient and robust electrocatalysts for scalable hydrogen production with practical materials.

在设计用于水氧化的电催化剂以产生用于氧释放反应（OER）的高效催化位点，同时在大功率下保持其稳健性方面仍然存在挑战。本文中，开发了一种蚀刻辅助合成方法，以将高活性NiFe ₂ O ₄纳米颗粒与坚固且具有活性的NiOOH支架直接集成在商用不锈钢上。然后，引入了一种精确的硒化策略，以实现对NiFe ₂ O _4的选择性Se掺杂，以进一步增强其固有的OER活性，同时保持三维NiOOH纳米片阵列作为快速传质和气体逸出的坚固支架。生成的NiFe ₂ O _{4− x}Se _x / NiOOH电极表现出优异的电催化活性，具有153和259 mV的低过电势，可分别提供10和500 mA cm ^-2的基准电流密度。更重要的是，该催化剂在100mA cm ^-2的稳定电流输出下数百小时显示出显着的耐久性。这些发现可能为探索有效和坚固的电催化剂以利用实际材料进行可扩展的氢气生产开辟机会。