Asymmetric cycling of vanadium redox flow batteries with a poly(arylene piperidinium)-based anion exchange membrane

Abstract The potential application of a 50 ?m thick anion exchange membrane prepared based on poly(terphenyl piperidinium-co-trifluoroacetophenone) (PTPT) is investigated for vanadium redox flow batteries (VRFBs). PTPT exhibits considerably lower permeation than Nafion 212. Therefore, the self-discharge duration VRFB much longer Besides, shows oxidative stability almost as good 212 during immersion in an ex-situ test more 400 h. Comparing performance when symmetric and asymmetric electrolyte volumes are used yields interesting results. results show that cycling effective efficient assembled with capacity fade 0.03% cycle?1, highest coulombic efficiency 98.8% attained. Furthermore, color change can be reversed using straightforward post-treatment method.