期刊
ELECTROCHIMICA ACTA
卷 120, 期 -, 页码 429-438出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.116
关键词
Polymer electrolyte membrane; Poisson-Nernst-Planck equations; Water drag; Conductivity
资金
- SIU, Norway
In this contribution, modified Poisson-Nernst-Planck equations are applied to study the distribution and flow of protons within cylindrical, water-filled nanopores of polymer electrolyte membranes (PEM). The model incorporates finite-size effects and an explicit expression for the relative permittivity. Due to the geometry, the problem decouples into a modified Poisson-Boltzmann equation in the radial direction and the Stokes equation in the axial direction. Ion saturation near pore walls, radial permittivity profiles, conductivity and water drag are properties of particular interest. Shortcomings and the usefulness of continuum models are elucidated and how these models might be employed to simulate macroscopic membrane properties. (C) 2014 Elsevier Ltd. All rights reserved.
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