碳包覆纳米SnO2中空纤维的制备及电容性能

采用同轴静电纺丝法制备了碳包覆纳米SnO₂中空纤维超级电容器电极材料.利用X射线衍射(XRD)、拉曼光谱、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和比表面积分析仪(BET)对材料进行表征.结果表明,纤维呈现中空形貌,平均直径为1 μm; SnO₂颗粒均匀分布于碳壳结构中,平均粒径为3-15 nm.材料的比表面积为565 m²·g^-1.在三电极体系中,当电流密度为0.25 A·g^-1时,电极材料的比容量达397.5 F·g^-1;在1.0A·g^-1电流密度下,充放电循环3000次后比容量仍保持为初始值的88%.在对称型双电极体系中,电流密度为0.25 A·g^-1时,电极材料的比容量达162.0 F·g^-1,在1.0 A·g^-1电流密度下,充放电循环3000次后比容量仍保持为初始值的84%.

Preparation and Supercapacitor Properties of Carbon-Coated SnO2 Hollow Fibers

A new carbon-coated SnO₂ hollow fiber was successfully prepared by coaxial electrospinning, and its supercapacitor properties were well studied. The surface morphology and structure were examined using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the Brunauer-Emmett-Teller (BET) method. The results showed hollow fibers of average diameter 1 μm and carbon-coated SnO₂ particles of average size 3-15 nm uniformly distributed on the fiber shell. The surface area was 565 m²·g^-1. In a three-electrode system, the electrode achieved a respectable specific capacitance of 397.5 F·g^-1 at 0.25 A·g^-1, and the capacitance retained ratio was still 88% of the initial value after 3000 cycles at 1.0 A·g^-1. In the case of a symmetrical two-electrode system, the electrode achieved a specific capacitance of 162.0 F·g^-1 at 0.25 A·g^-1 current density, and the capacitance retained ratio was 84% of the initial value after 3000 cycles at 1.0 A·g^-1.