There is another region between the mass transport and the kinetic regions which we refer to as the intermediate or the transitional region, usually omitted in Tafel plots but which contributes to further nonlinearity of the log(J)-V response and to the total current density; it is expressed as 𝑗 𝑖𝑛𝑡 and is shown Fig. . Luckás and Kristóf show that this region holds important data with regards of exchange current of the electrochemical system. Therefore, the total current can be expressed as follows: