A large number of highly active Ru-based electrocatalysts have been reported for the hydrogen evolution reaction (HER). The utilization of synergistic effects for promoting HER performance remains inadequate, especially for corresponding potential-driven reactive sites at the atomic level. Herein, a Co-substituted RuRu₂P structure is employed as a model system to reveal the synergistic effect on Ru-based electrocatalysts and to realize the potential-driven reactive sites during the HER. Optimized RuRu₂P @ Co_0.6 exhibits a superior catalytic performance in alkaline electrolytes, achieving a low overpotential of 9 mV at a current density of 10 mA cm^–2. To precisely describe the geometrical nature of surface moiety of Co(µ-O)₂Ru, an indicator (β) is established to quantify the strain of Co(µ-O)₂Ru moieties through calculating the LCoL (L = P or O) angles through employing in situ X-ray absorption spectroscopy. Both bond strain and corresponding metal-metal distance of CoRu in Co(µ-O)₂Ru moiety can significantly affect the structural tolerance and facilitate the coupling of adsorbed hydrogen atoms during HER. It is believed that the perspective raised in the present work will provide a new avenue to the design of highly active HER catalysts at the atomic scale.

中文翻译：

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赋予动态 Co(µ-O)2Ru 部分以高效催化析氢

已经报道了大量用于析氢反应（HER）的高活性钌基电催化剂。利用协同效应促进 HER 性能仍然不足，特别是对于原子水平上相应的电位驱动反应位点。在此，采用共取代的RuRu ₂ P结构作为模型系统，揭示了对Ru基电催化剂的协同效应，并在HER期间实现了电位驱动的反应位点。优化的 Ru  Ru ₂ P @ Co _{0.6在碱性电解质中表现出优异的催化性能，在 10 mA cm} ^–2的电流密度下实现了 9 mV 的低过电位. 为了准确描述Co( µ -O) ₂ Ru表面部分的几何性质，建立一个指标(β)来量化Co( µ -O) ₂ Ru部分的应变，通过计算L  Co  L (L = P 或 O) 角通过采用原位 X 射线吸收光谱。Co  Ru in Co( µ -O) ₂的键应变和相应的金属-金属距离Ru部分可以显着影响结构耐受性并促进HER期间吸附的氢原子的耦合。相信目前工作中提出的观点将为在原子尺度上设计高活性 HER 催化剂提供新的途径。