Improving proton conductivity and ionic selectivity of porous polyolefin membranes by chitosan deposition

Abstract The paper presents a new method for modifying polyolefin membranes using chitosan deposition in order to apply them as a separator in the redox flow batteries with an aqueous electrolyte. Chitosan is deposited from an aqueous carbonic acid under high pressure of saturating carbon dioxide, w...

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Bibliographic Details
Published in:Journal of Applied Polymer Science
Main Authors: Zefirov, Vadim V., Sizov, Victor E., Gulin, Alexander A., Gallyamov, Marat O.
Other Authors: Foundation for the Advancement of Theoretical Physics and Mathematics, Russian Foundation for Basic Research
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2021
Subjects:
Materials Chemistry
Polymers and Plastics
Surfaces, Coatings and Films
General Chemistry
Carbonic acid
Online Access:http://dx.doi.org/10.1002/app.50619
https://onlinelibrary.wiley.com/doi/pdf/10.1002/app.50619
https://onlinelibrary.wiley.com/doi/full-xml/10.1002/app.50619
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Summary:Abstract The paper presents a new method for modifying polyolefin membranes using chitosan deposition in order to apply them as a separator in the redox flow batteries with an aqueous electrolyte. Chitosan is deposited from an aqueous carbonic acid under high pressure of saturating carbon dioxide, which allows to increase the affinity of the composite membrane to aqueous electrolyte and, as a consequence, to increase the proton conductivity. In addition, the deposition of a chitosan film makes it possible to reduce the pore size, which means an increase in the ionic selectivity of the porous membrane. In the article, membranes modified with chitosan for different times were obtained. It was shown that as a result of the proposed treatment, the ionic selectivity of membranes increases from 0.2·10 7 ms·min/cm 3 to 5·10 7 ms·min/cm 3 .

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