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Electrochemical Characterization of Diffusion in Polymeric vs. Monomeric Solvents
Version 1
: Received: 20 February 2024 / Approved: 20 February 2024 / Online: 20 February 2024 (07:50:29 CET)
A peer-reviewed article of this Preprint also exists.
Porat, Z. Electrochemical Characterization of Diffusion in Polymeric vs. Monomeric Solvents. Int. J. Mol. Sci. 2024, 25, 4472. Porat, Z. Electrochemical Characterization of Diffusion in Polymeric vs. Monomeric Solvents. Int. J. Mol. Sci. 2024, 25, 4472.
Abstract
Polymer electrolyte was used as a medium for testing the performance of microband electrodes under conditions of linear diffusion. Cyclic voltammetry and chronoamperometry experiments were performed in such viscous medium, where diffusion rates are much slower than in fluid solutions. Confirmation of the existence of such conditions from the log i vs. log v or log i vs. log t relationships in the current equation always yielded values lower than the expected value of 0.5. This could indicate impure linear diffusion profile, i. e. some contribution from radial diffusion (edge effect). However, performing these tests in monomeric solvents of similar viscosities, such as glycerol or propylene glycol, gave the desired value of 0.5. These results lead to the conclusion that current equations which are based on Fick’s laws may not be applicable for polymer electrolytes, where various obstruction to diffusion make it a more complicated process than in monomeric solvents.
Keywords
polymer electrolytes; microband electrodes; linear diffusion; Fick’s equations; diffusion in polymers
Subject
Chemistry and Materials Science, Electrochemistry
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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