Designing and synthesizing efficient bifunctional electrocatalysts is of great significance for the application of overall water splitting but remains a great challenge. Herein, we synthesized low-crystallinity ruthenium oxides via a facile, eutectic molten salt-assisted method at low temperatures. Specifically, the optimized low-crystallinity RuO₂-250 nanosheets with a highly defective structure and better structural flexibility showed both higher acidic OER and alkaline HER activity than commercial counterparts, reaching as low as 210 mV and 52 mV overpotentials at the current density of 10 mA cm^-2 respectively. In situ Raman spectroscopy was employed to reveal the structural flexibility on the RuO₂ catalyst during HER, which could contribute to its high activity. Furthermore, an electrolyzer with RuO₂-250 catalyst requires only 1.57 V and 1.66 V cell voltage to achieve a current density of 10 mA cm⁻² for overall water splitting under alkaline and acidic conditions respectively. This work provides a facile strategy for efficient design and preparation of low-crystalline materials and offers a new insight into the kinetic process of the water-splitting on ruthenium oxide.

设计和合成高效的双功能电催化剂对于整体水分解的应用具有重要意义，但仍然是一个巨大的挑战。在此，我们通过简便的共晶熔盐辅助方法在低温下合成了低结晶度的氧化钌。具体而言，优化的低结晶度 RuO ₂ -250 纳米片具有高度缺陷结构和更好的结构灵活性，显示出比商业同类产品更高的酸性 OER 和碱性 HER 活性，在 10 的电流密度下达到低至 210 mV 和 52 mV 的过电位。 mA cm ^-2分别。原位拉曼光谱用于揭示 RuO ₂的结构灵活性HER 过程中的催化剂，这可能有助于其高活性。此外，具有RuO ₂ -250 催化剂的电解槽仅需要1.57 V 和1.66 V 的电池电压即可在碱性和酸性条件下分别实现10 mA cm ^-2的总水分解电流密度。这项工作为低结晶材料的有效设计和制备提供了一种简便的策略，并为氧化钌的水分解动力学过程提供了新的见解。