Microstructural description of ion exchange membranes: The effect of PPy-based modification
EntityUAM. Departamento de Química Física Aplicada
10.1016/j.memsci.2022.120771Journal of Membrane Science 659 (2022): 120771
ISSN0376-7388 (print); 1873-3123 (electronic)
Funded byThis 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-4-2019, by the Spanish Ministry of Economy PID 2020-116712RBC21 and Madrid Regional Research Council (CAM) grant. n. P2018/EMT-4344 BIOTRESCM
Projectinfo:eu-repo/grantAgreement/EC/H2020/875613; Gobierno de España. PID2020-116712RB-C21
SubjectsConductivity; Ion exchange membrane; Membrane modification; Micro-heterogenous model; Transport-structural parameters; Química
Rights© 2022 The Authors
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
Properties of ion exchange membranes (IEMs) both cationic and anionic were widely analysed before and after chemical. The modification aims to reduce the crossover phenomena typically observed in RFBs by incorporating polypyrrole (PPy) at the inner of commercial IEMs. In this work, we have explored the insight of membranes by structural and generalized conductivity considerations and its implications in terms of physicochemical characteristics. Transport Structural Parameters (TSP) have been obtained from the electrolyte concentration dependencies (NaCl, in this work). AEMs successfully increased their specific conductivity (between 2.5 and 3.9 times) whereas CEMs slightly decreased (between 1.3 and 2 times). This approach was useful for the description of membrane electro-transport by using the so-called two-phase model which considers an IEM as an heterophase system (particularly, gel and interstitial phase) and their arrangement. AEMs almost doubled increased whereas CEMs doubled decreased their internal microphase arrangement in terms of structural parameter (α). A modification of the established model was applied to the CEMs to better understand their specific behaviour after polymerization. Up to 3.5 times the diffusion coefficient was obtained in AEMs after PPy modification. Finally, based on TSP obtained we propose a microstructural description for the IEMs studied in this work
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Google Scholar:Salmeron Sanchez, Ivan - Asenjo Pascual, Juan - Avilés Moreno, Juan Ramón - Ocón Esteban, Pilar
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