624163.fig.0011
Figure 11: (A) Chronoamperogram (a) and profile of Δf variation (b) over time, obtained by applying a potential pulse of −980 mV and using a solution formed by [Co2+] 1 mM, [(NH4)2SO4] 1 M, and Ag substrate as working electrode. (B) Frequency change diagram as a function of the charge, obtained from curves (a) and (b).