关键词: 电化学电容器, 聚苯胺/多壁碳纳米管复合材料, 电容性能

Abstract: Polyaniline/multi-walled carbon nanotubes (PANI/MWCNT) composites synthesized by chemical oxidation method were characterized by scanning electron microscopy (SEM),X-ray diffraction (XRD) and IR techniques. In 1mol/L Li2SO4 neutral solution,the electrochemical performance of the composites electrode was investigated by cyclic voltammetry,galvanostatic charge-discharge tests and ac impedance spectroscopy. The results showed that the composites electrode performed well in 1mol/L Li2SO4 solution,the specific capacitance reached 412F/g at 5 mA/cm2. The composites electrode possessed better capability of high current than that of PANI electrode,the specific capacitance kept at 318 F/g at 50mA/cm2 and was 77.2% of that at 5 mA/cm2,but the specific capacitance of PANI at 50 mA/cm2 was only 56.2% of that at 5 mA/cm2. The addition of multi-walled carbon nanotubes could decrease the resistance of composites electrode,leading to remarkably improve the capability of high current discharge.

Key words: electrochemical capacitor, polyaniline/multi-walled carbon nanotubes composites, capacitance performance