where n is the number of electrons transferred (equal to 1), F is the Faraday constant equal to 96500 C/mol, A is EASA, C is a concentration in the bulk electrolyte, Ic is a pre-factor related to the capacitive current, Is is a steady-state residual current and τ is an RC circuit time constant of the system related to the discharge of the double layer. The applied strategy was validated using the obtained diffusion coefficient of the redox probe in a 0.1 M KCl solution and reported results in the literature as discussed in the SI file, section S5. Based on the Delahay equation, the D in the PBS solution was estimated to be 1.09