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Electrochemical performance of GQDs in supercapacitors: (a) cyclic voltammetry at different scan rates; (b) capacitance evaluated by CV; (c) potential profile in time in galvanostatic cyclations; (d) capacitance values calculated at different currents; (e) device life; and (f) electrochemical impedance spectroscopy showing GQD behavior (black dots) and fitting curve (red line).
