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Systematic characterization of degraded anion exchange membranes retrieved from vanadium redox flow battery field tests

Herrmann, Elke 1; Dingenouts, Nico 2; Roth, Christina; Scheiba, Frieder 1; Ehrenberg, Helmut 1
1 Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)


Commercially available anion exchange membranes were retrieved from VRFB field tests and their degradation due to the various operation conditions is analyzed by in-situ and ex-situ measurements. Ion exchange capacity, permeability and swelling power are used as direct criteria for irreversible changes. Small-angle X-ray scattering (SAXS) and Differential scanning calorimetry (DSC) analyses are used as fingerprint methods and provide information about the morphology and change of the structural properties. A decrease in crystallinity can be detected due to membrane degradation, and, in addition, an indication of reduced polymer chain length is found. While the proton diffusion either increase or decline significantly, the ion exchange capacity and swelling power both are reduced. The observed extent of changes was in good agreement with in-situ measurements in a test cell, where the coulombic and voltage efficiencies are reduced compared to a pristine reference material due to the degradation process.

Verlagsausgabe §
DOI: 10.5445/IR/1000135995
Veröffentlicht am 30.07.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2077-0375
KITopen-ID: 1000135995
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Membranes
Verlag MDPI
Band 11
Heft 7
Seiten Article: 469
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