Study On Fiber-shaped Flexible Graphene-based Supercapacitors For AC Line Filtering

Due to its high space utilization,excellent flexibility and good adaptability,fiber-shaped devices have great application potential in wearable electronic devices.However,the fiberization process of supercapacitors（SC）with alternating current（AC）line filtering is still far from satisfactory.This is because it is difficult for the fibrous electrode to construct an ordered structure during the preparation process,resulting in a slow response of the SC.We constructed a fibrous graphene-based high-frequency SC using a simple wet-spinning method.The main features of the SC are as follows:（1）The structure of the SC is orderly:the rGO fiber constituting the SC has a three-dimensional ordered porous structure,which greatly improves the ion mobility and the electron transport path;the wound-assembled SC increases the contact area between the electrode and the electrolyte,so that SC has a fibrous structure.The combination of these two aspects makes the SC have a high frequency response and can better adapt to rapidly changing current signals.（2）Excellent performance of SC:Fibrous SC exhibits high rate performance(no deformation of CV diagram at 500 V s^-1 sweep speed,small deformation of CV diagram at1000 V s^-1 sweep speed),fast frequency response（RC time constant⁰.241 ms,phase angle^-80°）,excellent flexibility（no significant loss in performance when bent to 0°to 180°and folded state）and excellent stability（charging and discharging cycles 10,000 times without performance degradation）.This makes it very powerful.（3）The practical application potential of SC is huge:the simple and batchable wet spinning preparation method enables SC to meet industrial production well;the excellent performance enables SC to meet the needs of circuit applications;the highly flexible fiber shape is better.Promote the use of flexible electronic products,especially in wearable electronic products.