Graphene-based fibers have attracted intense interests for fiber-shaped flexible supercapacitors. The pseudocapacitance materials such as transition metal oxides or conductive polymers have been widely deposited onto the surface of the graphene-based fibers to enhance their capacitive performance. Here, the flexible, bendable and knittable polyaniline (PANI)@reduced expandable graphene oxide (rEGO)/graphite powder (GP) (PANI@rEGO/GP) electrode with PANI in the well-defined porous rEGO/GP fiber was fabricated for high performance fiber-shaped solid state supercapacitors, via the in-situ electropolymerization of the aniline monomer adsorbed in the porous rEGO/GP fiber, which was prepared by the wet spinning of the expandable graphene oxide (EGO) with graphite powder as spacer, followed with reduction. Compared with the rEGO/GP@PANI electrode with PANI on the surface, the structural and electrochemical stability have been obviously enhanced for the solid state fiber-shaped symmetric supercapacitor of the proposed PANI@rEGO/GP fiber electrode, demonstrating the promising potential for practical application in the high performance fiber-shaped solid state supercapacitors.

石墨烯基纤维引起了人们对纤维状柔性超级电容器的浓厚兴趣。伪电容材料（例如过渡金属氧化物或导电聚合物）已广泛沉积在石墨烯基纤维的表面上，以增强其电容性能。在此，在良好定义的多孔rEGO / GP纤维中，制造了具有PANI的柔性，可弯曲和可编织的聚苯胺（PANI）@还原型可膨胀氧化石墨烯（rEGO）/石墨粉（GP）（PANI @ rEGO / GP）电极，通过将吸附在多孔rEGO / GP纤维中的苯胺单体进行原位电聚合制备高性能的纤维状固态超级电容器，该方法是将可膨胀石墨烯氧化物（EGO）以石墨粉为间隔物进行湿纺，然后减少。