NiFe-based materials are among the most promising alkaline oxygen evolution reaction (OER) catalysts because of their high intrinsic activities and abundance. Although many advanced NiFe-based catalysts have been developed, few exhibit simultaneous high activity, stability, good mass transfer, and cost-effective large-scale preparation. Furthermore, NiFe-based catalysts have rarely been studied in alkaline water electrolyzers (AWE) where the catalysts work under a large current density in an alkaline electrolyte at high temperatures and high concentrations with tight assembly pressure. This study successfully developes robust and highly active NiFe nanocone array (NA) catalysts that exhibit both fast and cost-effective mass production capabilities. Benefiting from the in situ-formed OER-active NiFe layered double hydroxide (LDH) and the superhydrophilic structure-induced fast mass transfer, the optimized NiFe NA sample presentes a low OER overpotential of 269 mV at 500 mA cm⁻² in a 30 wt% KOH solution. The NiFe core-NiFe LDH shell structure and metallic bond between NiFe nanocones and the substrate are crucial for enabling the NiFe electrode to maintain a minimal potential increase of only 4% even after 250 h of testing at 500 mA cm⁻² in a 30 wt% KOH solution. Moreover, the AWE using NiFe NA anodes and NiMo cathodes (NiFe//NiMo) works stably at 500 mA cm⁻² under 80 °C in 30 wt% KOH solution and presents a power energy consumption of 4.0 kWh Nm⁻³ H₂, much lower than that of the Ni mesh//Ni mesh counterpart and most commercial AWEs. This study, for the first time, evaluates the performance of NiFe electrodes in AWE and demonstrates their industrial application prospects in alkaline water electrolysis.

NiFe基材料因其高固有活性和丰度而成为最有前途的碱性析氧反应（OER）催化剂之一。尽管已经开发了许多先进的镍铁基催化剂，但很少有同时表现出高活性、稳定性、良好的传质和经济高效的大规模制备的催化剂。此外，镍铁基催化剂很少在碱性水电解槽（AWE）中进行研究，其中催化剂在碱性电解液中、在高温、高浓度和严格的组装压力下在大电流密度下工作。这项研究成功开发了坚固且高活性的 NiFe 纳米锥阵列 (NA) 催化剂，该催化剂具有快速且经济高效的大规模生产能力。^-2在 30 wt% KOH 溶液中。NiFe核-NiFe LDH壳结构以及NiFe纳米锥与基底之间的金属键对于使NiFe电极即使在30 wt 500 mA cm ^-2下测试250小时后仍能保持仅4%的最小电位增加至关重要。% KOH 溶液。此外，使用NiFe NA阳极和NiMo阴极（NiFe//NiMo）的AWE在80℃、30wt％KOH溶液中稳定工作在500mA cm ^-2下，功耗为4.0 kWh Nm ^-3 H ₂，远低于 Ni 网//Ni 网对应物和大多数商业 AWE。本研究首次评估了AWE中NiFe电极的性能，并展示了其在碱性水电解中的工业应用前景。