Abstract Searching for earth-abundant, highly efficient, and stable bifunctional electrocatalysts for water splitting is critical for the further development of sustainable energy generation, yet it remains a great challenge. Herein, a facile electrodeposition strategy followed by wet-chemistry treatment is reported for the fabrication of the ultralow amount loading of ruthenium (Ru) on CoMo alloy supported on carbon fiber paper (CFP) substrate (Ru-CoMo/CFP). Benefiting from the unique nano-architectures and synergetic effect of loading Ru material and CoMo alloy, the optimized Ru-CoMo/CFP exhibits excellent electrocatalytic activity and favourable stability toward electrochemical water splitting. The as-prepared Ru-CoMo/CFP composite exhibits a current density of 10 mA·cm−2 at overpotentials of 44 and 237 mV for catalyzing hydrogen and oxygen evolution reaction (HER/OER) in alkaline medium, respectively. The as-synthetized Ru-CoMo/CFP electrode is also demonstrated to function as anode and cathode, simultaneously, only needs a cell voltage of 1.54 V to yield 10 mA·cm−2, outperforming the state-of-the-art RuO2||Pt/C couple (1.56 V). This work demonstrates substantial improvement in the design of high-efficiency electrodes for water electrolysis.

中文翻译：

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超低钌负载钴钼二元合金作为高效和超稳定的水分解电催化剂

摘要 寻找地球储量丰富、高效且稳定的双功能水分解电催化剂对于可持续能源发电的进一步发展至关重要，但仍然是一个巨大的挑战。在此，报道了一种简单的电沉积策略，然后进行湿化学处理，用于在碳纤维纸 (CFP) 基材 (Ru-CoMo/CFP) 上支撑的 CoMo 合金上制造超低量的钌 (Ru)。得益于独特的纳米结构和负载 Ru 材料和 CoMo 合金的协同效应，优化的 Ru-CoMo/CFP 表现出优异的电催化活性和良好的电化学水分解稳定性。所制备的 Ru-CoMo/CFP 复合材料在 44 mV 和 237 mV 的过电位下表现出 10 mA·cm-2 的电流密度，用于在碱性介质中催化析氢和析氧反应 (HER/OER)。合成的 Ru-CoMo/CFP 电极也被证明可用作阳极和阴极，同时，仅需 1.54 V 的电池电压即可产生 10 mA·cm-2，性能优于最先进的 RuO2| |Pt/C 对 (1.56 V)。这项工作证明了用于水电解的高效电极设计的实质性改进。