Model of confined water self-diffusion and its application to proton-exchange membranes

A model of self-diffusion in confined water is proposed. It is based on the idea that confined water forms structures similar to hexagonal ice and its transport characteristics can be described in the framework of a quasiparticle approach. It is assumed that the quasiparticles responsible for self-d...

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Bibliographic Details
Published in:Ionics 2021-06, Vol.27 (6), p.2717-2721
Main Authors: Galitskaya, Elena A., Zavorotnaya, Ulyana M., Ryzhkin, Ivan A., Sinitsyn, Vitaly V.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Diffusion coefficient
Electrochemistry
Elementary excitations
Energy Storage
Ideal gas
Lattice vacancies
Membranes
Moisture content
Optical and Electronic Materials
Porous media
Protons
Renewable and Green Energy
Self diffusion
Short Communication
Transport properties
Water chemistry
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Summary:A model of self-diffusion in confined water is proposed. It is based on the idea that confined water forms structures similar to hexagonal ice and its transport characteristics can be described in the framework of a quasiparticle approach. It is assumed that the quasiparticles responsible for self-diffusion are D- and L-bond defects, which in the case of confined water are interstitial H 2 O molecules and vacancies in an ice-like lattice. The process of D-defect migration is described as the diffusion of an ideal gas through a porous medium. The analytical expression for the self-diffusion coefficient of confined water depending on the water content quantitatively well describes the experimental data for Nafion-type of proton-exchange membranes.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-021-04083-0