fig6

Figure 6. Electrochemical performances of symmetric supercapacitors using 6M KOH as electrolyte. (A) CV curves at various scan rates of CAC-24-based symmetric supercapacitors in 6M KOH aqueous solution. (B) GC curves at various current densities of CAC-24-based symmetric supercapacitors. (C) Gravimetric energy densities of CAC and CAC-x-based symmetric supercapacitors. (D) Volumetric energy densities of CAC and CAC-x-based symmetric supercapacitors calculated by material skeleton densities. (E) Ragone plots of CAC-24-based symmetric supercapacitors compared to some reported carbon-based supercapacitors in aqueous systems. (F) Cycling performance at 5 A g^-1 of CAC-24-based symmetric supercapacitor.