Highly active and durable electrocatalysts for oxygen evolution reaction (OER) play a vital role in water splitting. Despite numerous efforts, the strategies to prepare durable and effective electrocatalysts via scalable methods still remain a great challenge. In this work, we fabricated Fe-doped Ni(OH)₂ ultrathin nanosheets (Fe–Ni–OH/Ni) via autologous growing of Ni(OH)₂ from Ni foam, and in situ electrochemical-assisted doping Fe into Ni(OH)₂. Benefiting from the unique structure with large surface areas and strong coupling effects between Fe and Ni, the optimal Fe–Ni–OH electrodes exhibit remarkable catalytic performance toward OER, which requires an overpotential of 220 mV to achieve a current density of 10 mA cm⁻² with a Tafel slope of 48.3 mV dec⁻¹. The Fe–Ni–OH electrodes also possess high stability even under a high current density of 500 mA cm⁻² for 600 h with an ultralow overpotential of 290 mV. Using Ni–Fe–OH electrodes as both anode and cathode for overall water splitting, only a small overpotential of 1.57 V is required to reach a current density of 10 mA cm⁻². Moreover, the high catalytic performance and scalable preparation method can meet the emergency needs for the practical application.

用于氧气析出反应（OER）的高活性和持久性电催化剂在水分解中起着至关重要的作用。尽管做出了许多努力，但是通过可扩展方法制备耐用且有效的电催化剂的策略仍然是巨大的挑战。在这项工作中，我们通过从泡沫镍中自生生长Ni（OH）₂并原位电化学辅助将Fe掺杂到Ni（OH ）中，制备了Fe掺杂的Ni（OH）₂超薄纳米片（Fe–Ni–OH / Ni）。）₂。得益于独特的结构，大表面积以及铁与镍之间的强耦合效应，最佳的Fe-Ni-OH电极对OER表现出出色的催化性能，这需要220 mV的超电势才能实现10 mA cm-的电流密度^{- 2}Tafel斜率为48.3 mV dec ^-1。Fe-Ni-OH电极即使在500 mA cm ^-2的高电流密度下持续600 h，也具有290 mV的超低超电势，也具有很高的稳定性。使用Ni-Fe-OH电极作为整个水分解的阳极和阴极，仅需1.57 V的小过电位即可达到10 mA cm ^-2的电流密度。而且，高催化性能和可扩展的制备方法可以满足实际应用中的紧急需求。