高性能聚苯胺/石墨烯复合材料的制备及在超级电容器中的应用

Preparation and application of PANI/graphene composite materials with high performance for supercapacitor

采用化学氧化法制得氧化石墨烯(GO),再用NaBH4还原得到石墨烯(GN);以二氧化锰为氧化剂,室温下通过化学氧化聚合法制备了聚苯胺/石墨烯复合材料(PANI/GN)。采用扫描电子显微镜(SEM)及X-射线衍射(XRD)对其结构和形貌进行了表征。以PANI/GN为活性物质制备电极,1.0mol/L H2SO4水溶液为电解液组装超级电容器,用循环伏安法(CV)和恒电流充放电技术分别测试了PANI/GN电化学性能,在0.1A/g的电流密度下的比容量为468.5F/g,经过1000次连续充放电,电容保持率为84.9%。与PANI、GN单一材料相比,PANI/GN复合物具有较高的比电容和很好的循环稳定性。

Grapheme oxide （CdD） was prepared by chemical oxidation, and then was reduced by NaBH4, graphene （GN） was obtained. Polyaniline/graphene （PANI/GN） composite materials were prepared by chemical oxidative polymeri- zation at ambient temperature, using manganese dioxide as the oxidant. The morphology and structure of PANI/GN com- posite materials were characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Symmetric redox supercapacitor was assembled with PANI/GN as active electrode material and 1.0mol/L H2SO4 aqueous solution as elec- trolyte. The electochemical performance of these supercapacitors was investigated by cyclic vohammetry （CV） and galvano- static charge-discharge. The specific capacitance of PANI/GN electrode was about 468. 5F/g at 0. 1A/g. After 1000 charge discharge cycles its capacitance retention was 84. 9 %. For comparison with PANI and GN single material, PANI/GN com- posite material had higher capacity and better cycle stability.