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Article

Systematic Characterization of Degraded Anion Exchange Membranes Retrieved from Vanadium Redox Flow Battery Field Tests

1
Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
2
Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
3
Faculty of Engineering Science, Electrochemical Process Engineering, University of Bayreuth, 95447 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Dirk Henkensmeier
Membranes 2021, 11(7), 469; https://doi.org/10.3390/membranes11070469
Received: 18 May 2021 / Revised: 18 June 2021 / Accepted: 21 June 2021 / Published: 25 June 2021
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. View Full-Text
Keywords: vanadium redox flow battery; degradation; anion exchange membrane; field test; real battery system vanadium redox flow battery; degradation; anion exchange membrane; field test; real battery system
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MDPI and ACS Style

Herrmann, E.; Dingenouts, N.; Roth, C.; Scheiba, F.; Ehrenberg, H. Systematic Characterization of Degraded Anion Exchange Membranes Retrieved from Vanadium Redox Flow Battery Field Tests. Membranes 2021, 11, 469. https://doi.org/10.3390/membranes11070469

AMA Style

Herrmann E, Dingenouts N, Roth C, Scheiba F, Ehrenberg H. Systematic Characterization of Degraded Anion Exchange Membranes Retrieved from Vanadium Redox Flow Battery Field Tests. Membranes. 2021; 11(7):469. https://doi.org/10.3390/membranes11070469

Chicago/Turabian Style

Herrmann, Elke, Nico Dingenouts, Christina Roth, Frieder Scheiba, and Helmut Ehrenberg. 2021. "Systematic Characterization of Degraded Anion Exchange Membranes Retrieved from Vanadium Redox Flow Battery Field Tests" Membranes 11, no. 7: 469. https://doi.org/10.3390/membranes11070469

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