RuO₂ nanorods on electrospun carbon nanofibers were simply grown by precipitation and recrystallization methods for studying their capacitive behaviors for supercapacitor applications. Recrystallization by heat treatment is carefully performed at various temperatures: 180, 220, and 300 °C. Under optimal growth conditions, application of RuO₂-carbon nanofibers annealed at 220 °C with a very low loading concentration of Ru as the electrode material in a KOH aqueous electrolyte leads to a good capacitance capability of 188 F g^–1 at a current density of 1 mA cm^–2 and a high energy density of 22–15 W h kg^–1 in the power density range of 400–4000 W kg^–1 for supercapacitor applications. The capacitance of RuO₂-carbon nanofibers after 3000 cycles also maintains approximately 93% of its initial value at a discharge current density of 1 mA cm^–2. The excellent electrochemical performance of RuO₂-carbon nanofibers is mainly attributed to their large surface area with many mesopores as well as their electroactive functional sites, which have the appropriate degree of crystallinity. Therefore, a larger mesopore volume and low-dimensional RuO₂ nanorods on carbon nanofibers are beneficial for low internal resistance, leading to ion charge diffusion and charge storage in the bulk of amorphous material.

中文翻译：

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静电纺丝碳纳米纤维上的RuO ₂纳米棒，用于超级电容器

通过沉淀和重结晶方法简单地生长了电纺碳纳米纤维上的RuO ₂纳米棒，以研究其在超级电容器应用中的电容性能。在180、220和300°C的各种温度下，小心地进行通过热处理的重结晶。在最佳生长条件下，在220℃退火且Ru的负载浓度极低的RuO _2-碳纳米纤维作为电极材料在KOH水性电解质中的应用导致在电流密度下具有188 F g ^–1的良好电容能力1 mA cm ^–2的功率密度和22–15 W h kg ^–1的高能量密度，在400–4000 W kg ^–1的功率密度范围内适用于超级电容器应用。在放电电流密度为1 mA cm ^–2时，RuO _2-碳纳米纤维的电容在3000次循环后也保持其初始值的约93％。RuO _2-碳纳米纤维的出色电化学性能主要归因于它们的大表面积，许多中孔以及具有适当结晶度的电活性功能位。因此，较大的中孔体积和碳纳米纤维上的低尺寸RuO ₂纳米棒有利于降低内部电阻，从而导致离子电荷扩散和电荷存储在大部分非晶材料中。