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Poly(arylene alkylene)s functionalized with perfluorosulfonic acid groups as proton exchange membranes for vanadium redox flow batteries
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Tillämpad elektrokemi.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, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Tillämpad elektrokemi.ORCID-id: 0000-0002-0452-0703
2023 (engelsk)Inngår i: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 671, artikkel-id 121390Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier BV , 2023. Vol. 671, artikkel-id 121390
Emneord [en]
Vanadium redox flow battery, Proton exchange membrane, Nafion, Polyphenylene, Sulfonic acid
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Identifikatorer
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
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QC 20230320

Tilgjengelig fra: 2023-03-20 Laget: 2023-03-20 Sist oppdatert: 2023-03-20bibliografisk kontrollert

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Khataee, AmirrezaLindström, Rakel

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