Figure 3. Electrochemical properties of branched CNC supercapacitor devices.

(a) Cyclic voltammetry (CV) measured with 10 – 500 mVs⁻¹ scan rates. (b) Galvanostatic charge/discharge (CD) results measured at a constant current density of 5 µAcm⁻². The capacitances by the geometrical area calculated from CD curves are 409 µFcm⁻². (c) The capacitance change as a function of temperature (20°C to 80°C). (d) CNC devices are compared with various energy storing devices by the Ragone plot that is the values of energy density for power density. (SG: single layer graphene¹⁸, RMGO: reduced multilayer graphene oxide¹⁸, HGO: hydrated graphitic oxide¹⁹, LSG-EC: laser-scribed graphene electrochemical capacitor²⁰).