Electrochemically exfoliated graphene oxide enhanced hybrid fibers with high rate performance for fibrous supercapacitors

In this study, a composite graphene fiber was created using electrochemically exfoliated graphene oxide (EGO) and chemically oxidized graphene oxide (GO) through a simple wet spinning process. The incorporation of EGO sheets in the fiber forms a highly conductive network, significantly enhancing its conductivity. The optimized EGO/GO fiber exhibits both high areal capacitance (532 mF cm−2) and volumetric capacitance (103 F cm−3). Moreover, the EGO/GO composite fiber demonstrates superior capacitance retention and increased fiber length compared to the GO fiber. A solid-state device was also constructed by the optimized EGO/GO fiber using PVA/H2SO4 gel electrolyte which demonstrates excellent flexibility. And the as prepared solid-state fiber shaped supercapacitor demonstrates an areal capacitance of 246 mF cm−2 at a current density of 0.69 mA cm−2, while maintains 185 mF cm−2 at a current density of 34.7 mA cm−2 showcasing excellent rate performance.