Owing to its earth abundance, low kinetic overpotential, and superior stability, NiFe‐layered double hydroxide (NiFe‐LDH) has emerged as a promising electrocatalyst for catalyzing water splitting, especially oxygen evolution reaction (OER), in alkaline solutions. Unfortunately, as a result of extremely sluggish water dissociation kinetics (Volmer step), hydrogen evolution reaction (HER) activity of the NiFe‐LDH is rather poor in alkaline environment. Here a novel strategy is demonstrated for substantially accelerating the hydrogen evolution kinetics of the NiFe‐LDH by partially substituting Fe atoms with Ru. In a 1 m KOH solution, the as‐synthesized Ru‐doped NiFe‐LDH nanosheets (NiFeRu‐LDH) exhibit excellent HER performance with an overpotential of 29 mV at 10 mA cm⁻², which is much lower than those of noble metal Pt/C and reported electrocatalysts. Both experimental and theoretical results reveal that the introduction of Ru atoms into NiFe‐LDH can efficiently reduce energy barrier of the Volmer step, eventually accelerating its HER kinetics. Benefitting from its outstanding HER activity and remained excellent OER activity, the NiFeRu‐LDH steadily drives an alkaline electrolyzer with a current density of 10 mA cm⁻² at a cell voltage of 1.52 V, which is much lower than the values for Pt/C–Ir/C couple and state‐of‐the‐art overall water‐splitting electrocatalysts.

中文翻译：

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通过定制水离解活性位点，在NiFe层状双氢氧化物电催化剂上加速氢的生成动力学

由于其丰富的土壤，低的动态超电势和出色的稳定性，NiFe层状双氢氧化物（NiFe-LDH）已成为在碱性溶液中催化水分解，尤其是氧释放反应（OER）的有前途的电催化剂。不幸的是，由于极慢的水分解动力学（Volmer步骤），NiFe-LDH在碱性环境下的析氢反应（HER）活性相当差。这里展示了一种新颖的策略，可以通过用Ru部分取代Fe原子来大大加速NiFe-LDH的氢释放动力学。在1 m KOH溶液中，合成的Ru掺杂的NiFe-LDH纳米片（NiFeRu-LDH）表现出出色的HER性能，在10 mA cm ^-2时的过电势为29 mV，这比贵金属Pt / C和报道的电催化剂要低得多。实验和理论结果均表明，将Ru原子引入NiFe-LDH可有效降低Volmer步骤的能垒，从而最终加速其HER动力学。NiFeRu‐LDH得益于其出色的HER活性和出色的OER活性，在1.52 V的电池电压下稳定地驱动电流密度为10 mA cm ^-2的碱性电解槽，该电解槽的电压远低于Pt / C的值– Ir / C耦合和最先进的整体水分解电催化剂。