fig6
Figure 6. (A) CV curves at various scan rates, (B) GCD curves at various current densities, (C) Specific capacitance and (D) Ragone plot for ACG-Cys SSC; (E) Cycling stability performance at 10 A·g-1. CV: Cyclic voltammetry; GCD: galvanostatic charge-discharge; ACG: activated coffee grounds; SSC: symmetric supercapacitor.
