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(a) Nyquist spectrum recorded for the symmetric AC/Co3O4//AC/Co3O4 device developed in a 1 M Na2SO4 aqueous electrolyte, (b) Ragone plot of the symmetric AC/Co3O4//AC/Co3O4 device, and (c) capacitance retention vs Coulombic efficiency with a cycle number for the symmetric AC/Co3O4//AC/Co3O4 device at 6 A g–1.
