Kinetics of Non-Faradaic Electrode Processes

Mixed adsorption diffusion control was considered by Lorenz and Mockel [18], and they derived the following equations for the frequency-normalized admittance  

If the validity of the Fmmkin adsorption isotherm is assumed, it follows that [19] 

Lorenz [22] considered the case that a two-dimensional association occurs in the adsorption layer. Here the surfactant monomers are in equilibrium with surfactant clusters of constant size. He derived the corresponding frequency dependence of cot = C par/ par- For lower frequencies, a characteristic decrease in cot a should appear compared to cot (5a given by Eqs. (IL5.46) and (II.5.47). Such behaviour was in fact detected for higher concentrations of caproic as well as caprylic acid. 

---