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Electrochemical characterizations of AC//ZnSO4 (aq)//Zn hybrid supercapacitor: a) Cyclic voltammogram (10 mV s−1) of with stepwise increase in positive cell voltage limits; b) GCD characteristics (1 A g−1) at different voltage ranges; c) coulombic efficiencies at different voltage ranges; d) GCD and potentiostatic aging profiles at various voltages.
