C real signifies the amount of charge reversibly stored at the electrode while C imag signifies the energy dissipation from diffusion limitations and/or kinetically irreversible processes. High C real and low C imag signifies reversible charge storage behavior and smaller diffusion resistance of the electrodes. Each electrode shows maximum Creal at the lowest frequencies except GS-AC. In contrast, Cimag reaches a maximum value at frequencies of around 0.01 Hz and then decreases for GP-AC, S-AC, BPL-AC, and Y-AC. The maximum value of Cimag at a particular frequency refers to the relaxation time (the time needed to discharge all the energy from the supercapacitor device with > 50 % efficiency). The relaxation time follows the sequence BPL-AC ≃ GP-AC < Y-AC < S-AC < GR-AC < GS-AC. Cimag for GS-AC and GR-AC continue to increase at lowest frequencies and indicate the higher relaxation time needed to discharge the energy from the supercapacitor and slow kinetic behavior of these electrodes as compared to BPL-AC, GP-AC, Y-AC, and S-AC.