Chemical physics insight of PPy-based modified ion exchange membranes: a fundamental approach
Entity
UAM. Departamento de Química Física Aplicada; UAM. Departamento de Química OrgánicaPublisher
ElsevierDate
2021-11-03Citation
10.1016/j.memsci.2021.120020
Journal of Membrane Science 643 (2022): 120020
ISSN
0376-7388 (print)DOI
10.1016/j.memsci.2021.120020Funded by
This work has been funded by the European Union under the HIGREEW project, Affordable High-performance Green Redox Flow batteries (Grant agreement no. 875613). H2020: LC-BAT-4-2019875613)Project
info:eu-repo/grantAgreement/EC/H2020/875613/EU//HIGREEWEditor's Version
https://doi.org/10.1016/j.memsci.2021.120020Subjects
Ion exchange membrane; Mechanical properties; Membrane modification; Permeability; Permselectivity; Física; QuímicaRights
© 2021 The Authors
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
Four commercially available, cost-effective ion exchange membranes (two cationic and two anionic exchange membranes, CEMs and AEMs, respectively) were modified to mitigate crossover phenomena of the redox active species typically observed in Aqueous Organic Redox Flow Batteries (AORFB) systems. The modification strategy was carried out using a pyrrole(Py)-based polymer which successfully reduced the permeation of two redox active organic molecules, a viologen derivative (named BP7 throughout this study) and TEMPOL, by an order of magnitude. Additionally, modified membranes showed not significant changes in ion conductivity, with negligible effect on the electrical conductivity of the membranes at a given conditions. The morphology, physicochemical, mechanical, and electrochemical properties of the membranes were determined to evaluate the impact of these modifications. AEMs modified in this manner were found to have optimal properties, showing an increase in ion exchange capacity while maintaining excellent mechanical stability and unaltered permselectivity. Additionally, the diffusion boundary layer of these AEMs was slightly extended, which suggests a greater double layer stability for ion exchange processes than in the case of CEMs. Our work shows that these modified membranes could be an appealing approach for AORFB applications
Files in this item
Google Scholar:Salmeron-Sanchez, I.
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Asenjo-Pascual, J.
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Avilés-Moreno, J. R.
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Pérez-Flores, J. C.
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Mauleón Pérez, Pablo
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Ocón Esteban, Pilar
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