Numerical simulation of transient current responses in diluted electrochemical ionic systems

A versatile model for the simulation of electrochemical processes at a rotating disc electrode is presented. This model is based on the dilute solution ion model, in combination with an adequate description of electrode reaction kinetics. A brief introduction is given to the theoretical aspects of the model and the numerical solution technique being used to solve this model for the rotating disc electrode (RDE). A multiple ion electrolyte system with an excess of supporting electrolyte is considered. For several reaction conditions (reversible up to irreversible reactions) results of steady-state and linear sweep voltammetry simulations are presented and are compared with analytical and literature data. Based on computations of the current response, while sinusoidal varying potentials with different frequencies are applied, electrochemical impedances are also derived and compared with analytical results.