Fluoro-methyl sulfonated poly(arylene ether ketone-co-benzimidazole) amphoteric ion-exchange membranes for vanadium redox flow battery

The selectivity (a) and chemical stability (b) of 60SPAEK-6F-co-x%BI (X = 0, 5, 10, 15, 20) and Nafion117 IEMs.357