Alkaline oxygen evolution reaction is critical for green hydrogen production from water electrolysis but encounters great challenges when operated at industry-required ampere-scale current densities, such as insufficient mass transfer, reduced catalytic activity and limited lifetimes. Here we develop a one-step seed-assisted heterogeneous nucleation method (25 °C, 24 h) for producing a nickel–iron-based electrocatalyst (CAPist-L1, where CAP refers to the centre of artificial photosynthesis) for robust oxygen evolution reaction at ≥1,000 mA cm⁻². Based on the insoluble nanoparticles in the heterogeneous nucleation system, a dense interlayer is formed that anchors the catalyst layer tightly on the substrate, ensuring stable long-term durability of 15,200 h (>21 months) in 1 M KOH at 1,000 mA cm⁻². When applying CAPist-L1 as the anode catalyst in practical anion exchange membrane water electrolysis, it delivers a high activity of 7,350 mA cm⁻² at 2.0 V and good stability at 1,000 mA cm⁻² for 1,500 h at 80 °C.

碱性析氧反应对于水电解绿色制氢至关重要，但在工业所需的安培级电流密度下运行时会遇到巨大挑战，例如传质不足、催化活性降低和寿命有限。在这里，我们开发了一种一步种子辅助异质成核方法（25°C，24小时），用于生产镍铁基电催化剂（CAPist-L1，其中CAP指人工光合作用中心），以进行稳健的析氧反应≥1,000 mA cm ^-2时。基于异相成核系统中的不溶性纳米颗粒，形成致密的中间层，将催化剂层牢固地锚定在基材上，确保在1,000 mA cm ^-2的1 M KOH中稳定长期耐用15,200小时（>21个月） 。当在实际阴离子交换膜水电解中应用CAPist-L1作为阳极催化剂时，它在2.0 V下具有7,350 mA cm ^-2的高活性，并且在1,000 mA cm ^-2下在80 °C下持续1,500 h具有良好的稳定性。