ABSTRACT
The electrochemical processes are determined by Faraday’s law according to which the quantity of reagent converted electrochemically is proportional to the current that crosses the surface of the electrode and the residual current capacitance. However, the electrochemical reaction is essentially a heterogeneous process, and for thermodynamic and kinetic reasons, the reaction is possible in a certain domain of potential on a defined electrode surface. It comprises several elementary processes, namely, mass transport of the reactive species toward the electrode, adsorption on an active site, the exchange of electrons, possible chemical reactions, desorption, and then mass transport from the electrode toward the solution, which describe the global reaction, as depicted in Figure 21.1.
