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Practical ex-Situ Technique To Measure the Chemical Stability of Anion-Exchange Membranes under Conditions Simulating the Fuel Cell Environment

Abstract : Anion-exchange membrane (AEM) degradation during fuel cell operation represents the main challenge that hampers the implementation of AEM fuel cells (AEMFCs). Reported degradation values of AEMs are difficult to reproduce as no standard methods are used. The present use of different techniques based on exposure of membranes to aqueous KOH solutions under different conditions and measuring different outputs during time does not allow for a reliable and meaningful comparison of reported degradation data of different AEMs. In this study, we present a practical and reproducible ex-situ technique to measure AEM degradation in conditions that mimic an operando fuel cell environment. In this novel technique, we measure the change of the true hydroxide conductivity of the AEM over time, while exposing it to different relative humidity conditions. The technique does not make use of liquid alkaline solution, thus simulating real fuel cell conditions and providing a good baseline for comparative degradation studies.
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https://hal.archives-ouvertes.fr/hal-02491150
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Submitted on : Tuesday, February 25, 2020 - 6:49:37 PM
Last modification on : Wednesday, February 26, 2020 - 1:41:45 AM

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Jasmin Müller, Avital Zhegur, Ulrike Krewer, John Varcoe, Dario Dekel. Practical ex-Situ Technique To Measure the Chemical Stability of Anion-Exchange Membranes under Conditions Simulating the Fuel Cell Environment. ACS Materials Letters, ACS Publications, 2020, 2 (2), pp.168-173. ⟨10.1021/acsmaterialslett.9b00418⟩. ⟨hal-02491150⟩

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