Metallic Ni-based materials are promising electrocatalysts for commercial alkaline water electrolysis towards hydrogen generation. It is therefore desirable to develop low-cost and controllable synthesis protocols for efficient Ni-based electrocatalysts. Here we report a rapid one-step method to fabricate self-supported membranes of highly-conductive Ni-Co nanowires, which are formed via self-assembly of reduced Ni/Co nanoparticles under a rotating magnetic field. The Ni-Co nanowires are composed of Co nanoparticles and NiCo alloy nanoparticles domains, with abundant inherent interface defects due to incomplete alloying and insufficient Ostwald ripening during the assembly. Nanowires with different Ni/Co ratios are tested as the HER electrodes in comparison to pure Ni mesh and Ni foam electrodes; And the Ni_0.50Co_0.50 nanowire electrode gives the most optimized performance. The HER activity shows little degradation for nearly 100 h. These nanowire electrodes are superior to the state-of-the-art metallic Ni-based ones. This facile technology may represent a critical step towards scalable production of highly active and durable metallic Ni-based electrocatalysts for industry applications.

金属镍基材料是用于工业碱水电解制氢的有前途的电催化剂。因此，期望为有效的Ni基电催化剂开发低成本和可控制的合成方案。在这里，我们报告了一种快速的一步法来制造高导电Ni-Co纳米线的自支撑膜，该膜是通过在旋转磁场下自还原Ni / Co纳米粒子的自组装形成的。Ni-Co纳米线由Co纳米颗粒和NiCo合金纳米颗粒域组成，由于组装过程中合金化不完全和奥斯特瓦尔德熟化不充分而具有大量固有的界面缺陷。与纯Ni网格电极和Ni泡沫电极相比，测试了具有不同Ni / Co比的纳米线作为HER电极；和镍_0.50Co _0.50纳米线电极可提供最佳性能。HER活性在近100小时内几乎没有降解。这些纳米线电极优于最新的金属镍基电极。这种简便的技术可能代表了可扩展生产高活性和耐用性的金属镍基电催化剂以供工业应用的关键一步。