超级电容器与锂电池相比具有更高的循环稳定性以及更高的能量密度.提高超级电容器电极材料化学稳定性,增大离子吸附比表面积,以获得更好的电化学性能,成为超级电容器研究领域的热点.以湿化学还原法制备的石墨烯为基底,采用原位电化学沉积法制成了石墨烯/聚吡咯导电复合材料超级电容器电极.通过扫描电子显微镜(SEM)对电极的微观形貌进行了观察,利用电化学工作站对组装的超级电容器电化学性能进行了系统表征,同时探讨了沉积浓度和沉积时间对电化学性能的影响.结果表明,在0．2 mol/L 吡咯溶液中沉积时间为22．5 min制备出的石墨烯/聚吡咯导电复合材料电极的比电容可达388 F/g,表现出优良的超级电容器电化学性能.
Supercapacitor has higher cycle stability and higher energy density than lithium battery.In order to obtain better electrochemical performance,it is important for the electrode materials to obtain high chemical stability and large ion adsorption specific surface area.Graphene was prepared by the wet chemistry method. The polypyrrole was deposited on the surface of graphene with the constant potential in-situ electrochemical deposition method.The microtopography of electrode material was characterized by scanning electron micro-scope (SEM).The supercapacitor electrochemical properties were investigated by the electrochemical worksta-tion.And the same time,the deposition solution concentration,deposition time were discussed.The excellent specific capacitance with the value of 388 F/g was obtained when the deposition solution concentration was 0.2 mol/L pyrrole and deposition time was 22.5 min.
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