Abstract
In this work, electrochemically exfoliated graphene–chitosan hydrogel was prepared by a crosslinking reagent. Then, a symmetrical all-solid state supercapacitor was fabricated using graphene–chitosan hydrogel. Surface morphology of as-fabricated graphene was investigated using SEM and TEM. After constructing the symmetrical all-solid state supercapacitor, the device showed a specific capacitance (Cm) of 153.6 Fg-1 at 1 mAg-1 current density. A great capacitance retention after 1000 consecutive GCD cycles was observed with an over 97% of retention. The supercapacitor can carry a high energy density of 3.47 kWkg-1, as well as a high power density of 102.07 Wkg-1.
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