Hello,
I am currently working on a redox flow battery, well sorts of, the term redox may not be completely correct. The battery uses one side highly acidic (ph 0) and one highly alkaline (ph: 12,1-12,2) and I have two membrane types, but only one try. A quarternized polystyrol membrane will most likely be destroyes by the acid in long term. A clay membrane made from clay tiles has previously shown very promising in microbial fuel cell and alkaline fuel cell applications, but I am not sure about the ph stability of clay over long term. Whats your personal opinion, which one should I use
Please read this paper in order to know which one is the best:Article Membranes for Redox Flow Battery Applications
Good luck.
Oxidative stability is typically the main issue in flow batteries more than acid stability, but if you're purely looking for pH stability that's an easier one to deal with, but neither of your membranes sounds like it even makes that criteria (clay doesn't maintain integrity in strong acid, e.g. https://www.onepetro.org/conference-paper/SPE-19422-MS).
I believe one of the special Neosepta AEMs (ASTOM), FAA-3 (FuMa-tech), or Aemion (Ionomr - with full disclosure that I'm associated with this company) are the three commercial anion-exchange membranes that would have the requisite indefinite pH stability under these conditions alongside the high conductivity / high selectivity desirable.
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