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Статья

A modified Poisson-Boltzmann theory: Effects of co-solvent polarizability

EPL. 2015. Vol. 111. No. 2. P. 28002-p1-28002-p2.
Budkov Y., Kiselev M., Kolesnikov A.

In this paper within a field-theoretical approach taking into account explicitly a cosolvent with a nonzero dipole and a polarizability tensor, we derive a modified Poisson-Boltzmann equation. Applying the modified Poisson-Boltzmann equation, we formulate a generalized Gouy- Chapman theory for the case when an electrolyte solution is mixed with a polar co-solvent having a large polarizability. We show that an increase of the co-solvent concentration as well as the co-solvent polarizability lead to a significant increase of differential capacitance at sufficiently high surface potentials of the electrode, whereas the profile of the electrostatic potential becomes considerably more long-ranged. On the contrary, an increase in the permanent dipole of the co-solvent only weakly affects the differential capacitance.