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(a) Galvanostatic charge–discharge profiles, (b) rate capabilities, (c) Ragone plot, and (d) capacitance retention of a pouch-type symmetric cell with high-mass loading hierarchically porous activated carbon electrodes in 1.35–2.7 V. The current densities used in (a,b) are 1 mA/cm2 (0.12 A/g) to 10 mA/cm2 (1.2 A/g), while the current used in (c) is 245 mA (1.2 A/g and 10 mA/cm2).
