A theoretical analysis and its application of the second order EC reactions at microelectrodes under steady-state conditions

With a new approach, the general current expressions of two typical second order catalytic reactions are obtained for disk, hemispherical and spherical microelectrodes under steady-state conditions. This approach is based on the concept of reaction layer. For the second order EC reactions, we also discussed how it is possible to observe pseudo-first order or second order behavior. This consideration allows the study of the fast chemical reactions and systems where the bulk concentrations of the reactants are nearly equal. Regeneration of Fe3+(EDTA) with H202 was selected as an example of a rapid catalytic reaction.