Figure 5.

Comparison of (a) galvanostatic charge–discharge curve at a current density of 0.25 A g^–1 and (b) cyclic voltammogram at a scan rate of 10 mV s^–1 of STO and Mn-STO symmetric cells in a 3 M KOH aqueous electrolyte. (c) Galvanostatic charge–discharge at different current densities and (d) cyclic voltammogram at different scan rates of the symmetric Mn-STO supercapacitor. Cycling stability measurement of the Mn-STO symmetric supercapacitor at a current density of 1 A g^–1 (e) without adding an additive and (f) with a 0.1 M MnSO₄ electrolyte additive in an aqueous 3 M KOH electrolyte up to 10,000 cycles.