Fig. 2

Electrochemical characterization of L-MCH crochet structure electrode. a CVs of crochet L-MCH structure in 4 M KOH-based electrolyte solutions at scan rates of 10–40 mV s⁻¹ consisting of well-defined redox peaks due to both Mg²⁺ and Co²⁺ retaining the shape at higher potential. b A kinetic model describes the dependence of capacity on scan rate (ν), performed by cyclic voltammetry, is used to study charge storage mechanisms and their capacity contribution provides diffusion controlled redox capacitive contribution. c The specific capacitance of L-MCH crochet structure electrode with different current densities from 10 to 100 A g⁻¹. The concentration of the cations in the electrolyte solution was fixed at 4 M. d Galvanostatic cycles from 10 to 100 A g⁻¹ in KOH. e Capacitance retention after 10,000 cycles in 4 M KOH at 33.33 A g⁻¹, showing long-term stability. f Ragone plot, power density verses energy density plot for L-MCH crochet structure and comparison with ACC two-electrode cell and the designed asymmetric device. The energy density of the as-designed two-electrode cell is greater than the energy density of ACC and L-MCH tested in three-electrode system