Fig. 4

Two electrode device performance. a Cyclic voltammetry curves of the activated carbon cloth (ACC) electrodes with two-electrode cells showing the electric double-layer capacitor’s behavior from 0.0 to 1.0 V. b CV curve of the asymmetric supercapacitor with ACC as negative electrode (0.0 to 1.0 V) and L-MCH crochet structure as positive electrode (0.0–0.45 V) at different scan rates (10–100 mV). c Galvanostatic charge–discharge curves of L-MCH crochet structure electrode at different current densities in 4 M KOH. d Specific capacitance with different current densities. e Cycling performance of L-MCH||ACC asymmetric supercapacitor at current density of 2 A g⁻¹. f Ragone plot of L-MCH||ACC asymmetrical supercapacitor compared with the asymmetric hydroxide cells tested uptill now^{27,28,29,30,31}