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(a) GCD of the AC electrode at specific currents from 1 to 5 A g–1, (b) GCD of the AC/Co3O4 nanocomposite electrode at specific currents from 1 to 5 A g–1, (c) GCD comparison for AC and AC/Co3O4 nanocomposite electrodes at a current density of 1 A g–1, and (d) calculated Csp at a current density from 1 to 5 A g–1 for the AC and AC/Co3O4 nanocomposite electrode.
