Figure 3. (a) Galvanostatic cycles of the redox capacitor (TCHQ-AQ) in 0.5 M H₂SO₄ aqueous solution at 0.11 and 5.6 A/g, and (b) the rechargeable energy density of the redox capacitor (TCHQ-AQ) and the pure EDL capacitor (consisting of the nanoporous carbon) as a function of current density.