摘要
High volumetric specific capacitance is essential for flexible supercapacitors.In this paper,a flexible composite electrode with ultrahigh volumetric specific capacitance and good rate performance is designed and prepared.The film electrode is composed of non-porous compact polyaniline as the matrix and a small amount of reduced graphene oxide sheets as the conductive filler.The film is prepared by a newly developed solution casting method,where the casting solution is obtained by self-assembly of polyaniline and graphene oxide in a blended solution.A systematical investigation on the effect of reduced graphene oxide sheets reveals that they serve as both the conductive filler and the diffusion barrier.With the optimized reduced graphene oxide content,a large volumetric specific capacitance of 1354 F cm^−3 at 2.4 A cm^−3 is achieved,and good rate performance is also obtained because of the good ionic conductivity of polyaniline.This work provides a high performance electrode for flexible supercapacitors,and the solution casting method is also valuable in fabricating other organic electrode materials.
高体积比电容是柔性超级电容器的关键.在本文中,我们设计并制备了一种具有超高体积比电容和良好倍率性能的柔性复合电极.该膜电极以无孔且致密的聚苯胺作为基质,少量的还原氧化石墨烯片作为填料,通过一种新开发的溶液浇铸法制备而成.用于浇铸的溶液是由聚苯胺和氧化石墨烯的混合溶液自组装制备得到.关于还原氧化石墨烯作用的系统研究结果表明,还原氧化石墨烯既是导电填料又是扩散屏障.通过优化还原氧化石墨烯的含量,电极在2.4 A cm^-3下体积比电容高达1354 F cm^-3;同时由于聚苯胺具有良好的离子电导率,电极也表现出良好的倍率性能.本工作为柔性超级电容器提供了一种高性能的电极,同时溶液浇铸法有望应用于其他有机电极材料的制备.
基金
financially supported by the National Natural Science Foundation of China (21774104 and 21975210)
the Natural Science Foundation of Fujian Province (2018J06015)
