This Demonstration models the voltammetric response (black dots) for a reversible electron transfer reaction taking place at the surface of a planar macroelectrode, with cyclic staircase perturbation of the electrode potential (black staircase in the inset). The sampled staircase voltammetric response (black dots) is compared to the electrode response (orange line) obtained by application of a cyclic potential ramp (orange line in the inset). The model assumes semi-infinite diffusion of redox species normal to the electrode surface. You can experiment with the effects of the amplitude of potential step for the staircase signal, and the sampling condition for evaluation of the current response, using the controls for the dimensionless parameters and . The plots show the dimensionless current density as a function of the dimensionless potential . The relative deviations for the peak forward (pf) and peak reverse (pr) reactions for the two voltammograms are displayed, as well as the mean squared deviation (MSD).
δξ
γ
ψ
ξ
ϵ
ψ