In case of the B-V model, one can write the respective rate equations which then leads to the B-V equation. However, I will appreciate that the actual electron transfer may happen within the EDL, where the electric field is not zero and the electrostatic potential in the direct vicinity of the electrode can be very different from the bulk solution. Therefore, I must split reaction 1 into three distinct processes: (1) The reductant system in the bulk of the solution (𝑅𝑒𝑑 𝑎𝑞 ) becoming a reductant system in the EDL (𝑅𝑒𝑑 ∥ ), with the subscript ∥ for a system present in the EDL (Eq. 2a). Subsequently the electron transfer occurs (Eq. 2b). Finally, the oxidant system in the EDL (𝑂𝑥 ∥ ) becomes the oxidant system in the bulk (𝑂𝑥 𝑎𝑞 ). I will now assume, that the steps 1 and 3 are always equilibrated. This is illustrated in Fig. where the transition from the reductant to the oxidant system only occurs when the polarizations of the respective systems are compatible, the central idea of other models of electron transfer, such as the Marcus theory.