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As in polymer electrolytes, the main contribution is from the ion migration. So, the cation (t₊) and ion (t_ion) transference number is evaluated to check the exact contribution from ions and cation through cell configuration (SS|PE|SS), SS refers to stainless steel. The former is determined by a combination of ac impedance & d. c. polarization technique, while the latter is obtained from dc Wagner’s polarization technique [23, 24]. The cation transference number (t₊) is obtained via relation; ; [V is the applied voltage across cell configuration, I_i and I_s are the initial and steady-state currents, R_i, and R_s are the interfacial resistance before and after polarization]. The ion (t_ion) transference number is obtained via equation; ; [I_t and I_e are the total current and the residual current respectively and are related as i_t = i_ion + i_elec].