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Issue 5, 2014
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Ion effects at electrode/solid polymer electrolyte membrane interfaces

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The differential capacity and the potential distribution at electrode/solid polymer electrolyte membrane/solution interfaces are calculated through an analytical approach. The model considers coions' and counterions' permeation through the membrane from the solvent phase and the ions' partitioning equilibrium at the SPEM/solution interface. The latter effects are included by incorporating the Donnan equilibrium, the steric hindrance, the solvation energy change when ions move from water to membrane pores and ion electrostatic interactions. It is shown that capacitance maxima in capacitance–potential curves may appear because of the acid–base dissociation process inside the membrane and the change in the ions' total interaction energy with the applied potential. For low dielectric constants inside membrane pores, εp, sharp peaks can be obtained. These peaks broaden, decrease in magnitude and shift to positive potentials once εp is increased. Finally, model predictions are discussed in light of recent experimental data obtained on Nafion® covered Pt(111) electrodes, providing a theoretical framework for the qualitative electroanalysis of these systems.

Graphical abstract: Ion effects at electrode/solid polymer electrolyte membrane interfaces

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Publication details

The article was received on 03 Oct 2013, accepted on 19 Nov 2013 and first published on 19 Nov 2013

Article type: Paper
DOI: 10.1039/C3CP54173H
Citation: Phys. Chem. Chem. Phys., 2014,16, 1945-1956
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    Ion effects at electrode/solid polymer electrolyte membrane interfaces

    A. M. xmlns="http://www.rsc.org/schema/rscart38"> <sup>a</sup> </small>. Gómez-Marín and J. P. Hernández-Ortíz, Phys. Chem. Chem. Phys., 2014, 16, 1945
    DOI: 10.1039/C3CP54173H

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