is the potential drop in the diffuse layer according to the Gui-Chapman model, 102 ε b is the dielectric permittivity of the solution in the bulk (since dilute aqueous solutions are considered, the value is approximated as 78 ), c 0 is the concentration of the supporting electrolyte in mol/L, q i is the i ion charge, 22 i i w n r r  is the ratio of areas of the i ion and water molecule, r i and r w are the effective radius of the ion or water molecule. The parameters included in coefficients b j and c j (11,12) have the following physical meaning: μ j is the dipole moment perpendicular to the electrode surface;