Preparation and characterization of sulfonated poly(arylene ether ketone) copolymers with pendant sulfoalkyl groups as proton exchange membranes

Proton conducting sulfonated poly (imide-benzimidazole) with tunable density of covalent/ionic cross-linking for fuel cell membranes

“…As expected, the decrease in the number of sulfonic acid groups from 80 to 70 in both SPIBI-x and CBr-ySPIBI-x membranes leads to a reduction in proton conductivity, and cross-linking also decreases the proton conductivity of SPIBI membranes. A conductivity of 10 -2 S cm -1 is generally required for PEM materials in fuel cells [36]. In this study, all the CBr-ySPIBI-x membranes show proton conductivities 10 -2 S cm -1 because of high sulfonation level and special chemical structure.…”

Direct polymerization of a novel sulfonated poly(arylene ether ketone sulfone)/sulfonated poly(vinylalcohol) crosslinked membrane for direct methanol fuel cell applications

“…Moreover, the lower oxidative stability of crosslinked membrane with more SPVA also probably resulted from the instability of PVA aliphatic chain. Therefore, the resistance-to-oxidation of the membranes decreased [39]. In addition, the C-SPAEKS/SPVA crosslinked membranes possess more stable resistance-to-oxidation properties compared to PVA containing membranes.…”

Effect of different ion-aggregating structures on the property of proton conducting membrane based on polyvinyl alcohol

“…The membranes exhibit methanol permeability in the range of 8.98 Â 10 À 7 -1.39 Â 10 À 6 cm 2 s À 1 , which are lower than that of Nafion 117 (1.7 Â 10 À 6 cm 2 s À 1 ) [62]. The methanol permeability of M 2 and M 3 is lower than that of M 1 due to the introduction of alkyl groups reducing the vacant space absorbs free water molecules and inducing a much denser structure to act as the methanol barrier [63]. Meanwhile, the methanol permeability of M 3 is lower than that of M 2 .…”