多孔石墨烯/聚苯胺材质的超级电容器用电极薄膜的制备及其电化学性能

Preparation and Electrochemical Performance of Holey Graphene/PANI Films for Supercapacitor Electrodes

对于体积有限的小型便携式储能设备来说,电极材料在达到高比电容和稳定的循环性能的同时,更要向缩小占用体积的方向发展。本研究运用一种简单新颖的策略,制备出用于超级电容器电极的无需粘结剂、自支撑多孔石墨烯/聚苯胺复合薄膜。在该复合体系中,多孔石墨烯可以提供丰富的离子扩散通道,聚苯胺能够抑制石墨烯片层间的聚集堆积,并提供额外的赝电容。通过两者的协同作用,该电极薄膜在较高的密度下(1.47 g·cm^(-3)),拥有582 F·cm^(-3)的体积比电容以及卓越的循环稳定性。这种具备致密结构并且拥有卓越电化学性能的电极薄膜对于开发体积受到限制的小型便携式储能器件有着重要意义。

For miniaturized portable energy storage devices with limited space,electrode materials are needed to be developed in the direction of reducing the occupied volume without compromising high specific capacitance and stable cycling ability.Herein,a novel strategy was developed to fabricate a free-standing binder-free holey graphene/PANI composite film as a supercapacitor electrode.In this composite mechanism,holey graphene provides abundant ion transport channels.Meanwhile,polyaniline delivers additional pseudocapacitance and prevents graphene sheets from stacking.In consequence,this electrode films can perform a superior volumetric capacitance of 582 F·cm^(-3) and excellent cycle stability with a high packing density of 1.47 g·cm^(-3).Therefore,such kind of densely packed electrode film with excellent electrochemical performance is of great significance for the development of miniaturized portable energy storage devices.