Latin
C0, C0+, C0–	electrolyte and ion concentrations
D	diffusion coefficient of the electrolyte molecule in dilute solution
$D_{mi}$	diffusion coefficients of the electrolyte molecule inside i-layer
F	Faraday constant
hi	thickness of i-layer
h = h1 + h2	thickness of the membrane
H = h2/h1	ratio of membrane layer thicknesses
I, i	dimension and dimensionless current density
$I_{\lim }^{s,w}$ and $i_{\lim }^{s,w}=\frac{I_{\lim }^{s,w}\left(h_1+h_2\right)}{C_{0}FD}$	dimension and dimensionless values of the limiting current densities
jm	transmembrane flux density of electrolyte
P	coefficient of the integral diffusion permeability
R	universal gas constant
T	absolute temperature
U, u	dimension and dimensionless voltage
Greek
δ	thickness of diffusion layers adjacent to both membrane surfaces
Δ = δ/(h1 + h2)	dimensionless thickness of diffusion layers
ΔU	voltage difference
ΔI	current density difference
${\gamma }_{mi},{\gamma }_{mi\pm }$	equilibrium distribution coefficients of the electrolyte molecule and individual ions inside membrane i-layer
${\overline{\nu }}_{m1,m2}=\frac{D{\gamma }_{m1,m2}}{D_{m1,m2}}$	dimensionless physicochemical parameters
${\rho }_i,{\sigma }_i$	dimension and dimensionless i-layer exchange capacity
${\overline{\sigma }}_i={\sigma }_i{\gamma }_{mi}$	effective dimensionless i-layer exchange capacity
$\overline{\xi }$	dimensionless normalized sum of ions concentration on the right side of the interface between two membrane layers
Superscripts
s, w	related to a membrane oriented by modified layer to solution and water, respectively
Subscripts
i	related to membrane layer number i
m	related to a membrane
s, w	related to a membrane oriented by modified (1-st) layer to solution (anode) and water (cathode), respectively
lim	related to the limiting current regime
ohm	related to the ohmic part of CVC
overlim	related to the overlimiting current regime