碳纳米管/纤维素复合纸为电极的超级电容器性能

Carbon Nanotubes/Cellulose Composite Paper as Electrodes for Supercapacitor

采用化学气相沉积法合成晶须状碳纳米管(WMWCNTs)和碳纳米管(MWCNTs)。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、拉曼光谱仪(Raman)对其进行详细分析。以纸纤维为基体材料,晶须状碳纳米管和碳纳米管为功能材料,通过真空抽滤制得碳(WMWCNTs)/碳(MWCNTs)/纤维素复合纸。采用两电极测试体系,通过循环伏安及恒流充放电方法对其超级电容器性能进行测试。在扫描速率为1mV/s时,碳/碳/纤维素复合纸电极的比容量达到120F/g。在电流密度为0.4A/g时,碳/碳/纤维素复合纸电极比容量值可达51.5F/g。在电流密度为0.4~1.4A/g范围时,最大比能量和比功率分别为63.7Wh/kg和3.99kW/kg,表现出良好的超级电容器性能。

Whisker multiwalled carbon nanotubes(WMWCNTs)and multiwalled carbon nanotubes(MWCNTs)were synthesized via chemical vapor deposition(CVD),and were characterized by scanning electron microscope(SEM),X-ray diffraction(XRD)and Raman spectroscopy.Paper fibers were used as matrix material,WMWCNTs and MWCNTs as functional material.Paper fibers were mixed with dispersed WMWCNTs and MWCNTs by speed-cutting procedure in water.Then the composite papers were fabricated by vacuum filtration method.The electrochemical performance of the supercapacitor was tested by cyclic voltammetry,galvanostatic charge/discharge.The testing results indicate the supercapacitor has a maximum capacitance of 120F/g at a scan rate of 1mV/s and has a specific capacitance of 51.5F/g at 0.4A/g.The maximum energy density and power density reach 63.7Wh/kg and 3.99kW/kg respectively in the current range of 0.4-1.4A/g.