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Poly(arylene alkylene)s functionalized with perfluorosulfonic acid groups as proton exchange membranes for vanadium redox flow batteries
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.ORCID iD: 0000-0002-6282-9004
Lund Univ, Dept Chem, POB 124, SE-22100 Lund, Sweden..
Lund Univ, Dept Chem, POB 124, SE-22100 Lund, Sweden..ORCID iD: 0000-0002-9649-7781
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.ORCID iD: 0000-0002-0452-0703
2023 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 671, article id 121390Article in journal (Refereed) Published
Abstract [en]

With the aim to develop vanadium redox flow battery (VRFB) membranes beyond state of the art, we have in the present work functionalized poly(p-terphenylene)s with highly acidic perfluorosulfonic groups and investigated their performance as proton exchange membranes (PEMs). Consequently, two poly(p-terphenylene alkylene)s tethered with perfluoroalkylsulfonic acid and perfluorophenylsulfonic acid, respectively, were synthesized through superacid-mediated polyhydroxyalkylations and cast into PEMs. Compared with Nafion 212, the PEM carrying perfluorophenylsulfonic acid groups (PTPF-Phenyl-SA) was found to exhibit higher ionic conductivity and eight times lower vanadium (IV) permeation rate. The latter explains the longer self-discharge duration of the VRFB based on the PTPF-Phenyl-SA. In addition, the VRFB assembled with the PTPF-Phenyl-SA PEM exhibited a high average coulombic efficiency of 99.6% for over 100 cycles with a capacity fade of 0.24% per cycle, which was 50% lower than when Nafion 212 was used. More importantly, excellent capacity retention was achieved through electrochemical rate performance experiments at different current densities.

Place, publisher, year, edition, pages
Elsevier BV , 2023. Vol. 671, article id 121390
Keywords [en]
Vanadium redox flow battery, Proton exchange membrane, Nafion, Polyphenylene, Sulfonic acid
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-324701DOI: 10.1016/j.memsci.2023.121390ISI: 000925653500001Scopus ID: 2-s2.0-85146659317OAI: oai:DiVA.org:kth-324701DiVA, id: diva2:1744456
Note

QC 20230320

Available from: 2023-03-20 Created: 2023-03-20 Last updated: 2023-03-20Bibliographically approved

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Khataee, AmirrezaLindström, Rakel

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