Modelling of electrochemically switchable ion transport in nanoporous membranes with conductive surface

Ilya I. Ryzhkov ; Anton S. Vyatkin ; Maria I. Medvedeva

Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 12 (2019) no. 5, pp. 579-589.

Résumé

The impact of potential applied to the conductive surface of nanoporous membrane on the membrane potential at zero current is investigated theoretically on the basis of two–dimensional Space–charge model. The membrane separates two reservoirs with different salt concentrations. It is shown that the variation of applied potential from negative to positive values results in the continuous change of membrane selectivity from cation to anion. For equal ion diffusion coefficients, the dependence of membrane potential on the applied potential is an odd function, while for different ion diffusion coefficients it is shifted along the applied potential axis due to contribution of diffusion potential enhanced by the induced charge effect. The decrease of pore radius results in the increase of ionic selectivity and steep transition between cation–selective and anion–selective states when the applied potential is changing.

Détail

Keywords: nanoporous membrane, electric double layer, electrolyte transport, membrane potential, Space–charge model.

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