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Electrochemical characterization of supercapacitors based on graphene sponge containing 1.43 wt.%, 0.94 wt.%, 0.47 wt.%, and 0 wt.% GnPs. (a) Cyclic voltammetry (CV) curves obtained at 50 mV/s. (b) CV curves at various scan rates. (c) Galvanostatic charge/discharge (GCD) curves of the 1.43 wt.% graphene sponge. (d) Cyclic stability.
