The rational design of cost-effective, highly efficient, and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction (HER) is highly desirable and has garnered significant attention. Constructing core–shell nanostructures has emerged as an effective approach for regulating the interaction among diverse components, potentially enhancing structural stability and catalytic activity. Herein, we report a facile synthesis of Au@RuNi NWs via the epitaxial growth of a uniform fcc-structured RuNi alloy layer on the surface of ultrathin Au NWs. The prepared Au@RuNi NWs exhibit a remarkable alkaline HER performance with only a 19 mV overpotential to achieve a current density of 10 mA cm⁻², with a small Tafel slope of 32.63 mV dec⁻¹ and outstanding stability. The ultrathin 1D core–shell nanowire structure and the alloying effect of Ni within the fcc-RuNi alloy shell layer facilitate the water dissociation, resulting in accelerated alkaline HER kinetics. This work provides a facile method to rationally design and synthesize core–shell Ru-based electrocatalysts for extraordinary HER performance under alkaline conditions.

中文翻译：

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超薄核壳Au@RuNi纳米线具有优异的电催化析氢性能

合理设计经济高效、稳定的钌基电催化剂作为析氢反应（HER）中铂的替代品是非常理想的，并引起了人们的广泛关注。构建核壳纳米结构已成为调节不同组分之间相互作用的有效方法，有可能增强结构稳定性和催化活性。在此，我们报告了通过在超薄 Au 纳米线表面外延生长均匀的fcc结构 RuNi 合金层来轻松合成 Au@RuNi 纳米线。所制备的Au@RuNi NWs表现出显着的碱性HER性能，仅需19 mV的过电位即可实现10 mA cm ^{-2的电流密度，具有32.63 mV dec -1}的小塔菲尔斜率和出色的稳定性。超薄一维核壳纳米线结构和fcc -RuNi 合金壳层内 Ni 的合金化效应促进了水的解离，从而加速了碱性 HER 动力学。这项工作提供了一种合理设计和合成核壳钌基电催化剂的简便方法，可在碱性条件下实现卓越的 HER 性能。