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(a) Typical CV curves obtained at a scan rate of 10 mV s–1 for the pristine ACNF, MWNT/ACNF and CB electrodes; (b) typical charge/discharge curves obtained at a current density of 10 A g–1 for the ACNF electrodes; (c) specific capacitance of the electrodes as a function of current density; (d) cycling performance of the electrodes at a constant current density of 2 A g–1.
