Development of high-performance, high-stability and low-cost electrocatalysts toward the oxygen evolution reaction (OER) is pivotal to the water electrolysis at industrial current density. Herein, a novel Fe/Ni-based hierarchical structure was constructed with the assistance of 2D MXene, showing vertically aligned Ni(OH)₂ nanosheets decorated with distinct Fe₂O₃ morphologies. The Fe₂O₃/Ni(OH)₂/NF exhibited a remarkable OER activity and required only overpotentials of 291, 319 and 341 mV respectively at 500, 1000 and 1500 mA cm⁻² in alkaline solution and drove the current density of 1300 mA cm⁻² about 17 h at the potential of 1.64 V vs RHE. The Fe₂O₃/Ni(OH)₂ precursor underwent in situ surface reconstitution into active FeOOH/NiOOH during alkaline OER. The outstanding performance of Fe₂O₃/Ni(OH)₂/NF was attributable to the synergistic impact between FeOOH and NiOOH for regulating the optimal adsorption of OER intermediates. This work provides an ideal perspective to fabricate resource-rich, low-cost and high-activity FeNi-based electrode for alkaline OER at industrial current density.

开发高性能、高稳定性和低成本的析氧反应 (OER) 电催化剂对于工业电流密度下的水电解至关重要。在此，借助 2D MXene 构建了一种新型的基于 Fe/Ni 的分层结构，显示出装饰有不同 Fe ₂ O ₃形态的垂直排列的 Ni(OH) _{2纳米片。}Fe ₂ O ₃ /Ni(OH) ₂ /NF 表现出显着的 OER 活性，在碱性溶液中在500、1000 和 1500 mA cm ^-2下分别仅需要 291、319 和 341 mV 的过电势，驱动电流密度为 1300毫安厘米^-2在 1.64 V vs RHE 的电位下约 17 小时。在碱性 OER 过程中，Fe ₂ O ₃ /Ni(OH) ₂前体在原位表面重组为活性 FeOOH/NiOOH。_{Fe 2} O ₃ /Ni(OH) ₂ /NF的出色性能归因于 FeOOH 和 NiOOH 之间的协同作用调节 OER 中间体的最佳吸附。这项工作为在工业电流密度下为碱性 OER 制造资源丰富、低成本和高活性的 FeNi 基电极提供了理想的视角。