Abstract

This research evaluated the electrochemical performance of electrospun carbon nanofibers (CNFs) synthesized through a combination of the electrospinning technique and calcination at three different temperatures. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to determine the patterns and internal morphologies of the fibers, with the results indicating that the fiber diameter changed with the temperature. X-ray diffraction (XRD) showed the characteristics of the amorphous carbon. Additionally, the N₂ adsorption/desorption method provided the values of specific areas, and the three-electrode system showed the electrochemical properties when the experiment was carried out in aqueous electrolyte. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) provided the thermal characteristics of the as-spun materials, which could be helpful in determining the right temperature for further calcination. At the highest calcination temperature, the CNFs achieved the best specific capacitance of 173 F g⁻¹ at 0.5 A g⁻¹ with an energy density of 23 mWh g⁻¹, power density of 245 mW g⁻¹, and good cycling stability of 78% after 1000 cycles.

中文翻译：

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煅烧温度对超级电容器静电纺丝碳纳米纤维的影响

摘要

这项研究评估了静电纺丝纳米碳纤维（CNFs）的电化学性能，这些碳纤维是通过静电纺丝技术和在三种不同温度下煅烧的组合而合成的。用扫描电子显微镜（SEM）和透射电子显微镜（TEM）确定纤维的图案和内部形态，结果表明纤维直径随温度而变化。X射线衍射（XRD）显示出无定形碳的特性。另外，N ₂吸附/解吸法提供了比表面积的值，当在水性电解质中进行实验时，三电极体系显示出电化学性能。差示扫描量热法（DSC）和热重分析（TGA）提供了初纺材料的热特性，这可能有助于确定合适的温度以进一步煅烧。在最高煅烧温度下，CNF在0.5 A g ^-1下获得的最佳比电容为173 F g ^-1，能量密度为23 mWh g ^-1，功率密度为245 mW g ^-1，循环稳定性良好。 1000次循环后为78％。