Fig. 4

(a) Cyclic voltammetry in the scan rate ranging from 5 to 100 mV s^-1, (b) specific capacitance with respect of different scan rates of electrode, (c) ‘b’ at different potential (inset: \(\:\text{log}\left(i\right)\:vs.\:\text{log}\left(v\right)\) plot) and (d) Δj/2 vs. scan rate.