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The terpolymers with high molecular weight (Mw = 179–207 kDa, Mn = 41–50 kDa) and different ion exchange capacity (IEC) values (1.70, 2.56, and 3.34 mequiv g–1) gave flexible self-standing membranes by solution casting. Compared to the two-component (sulfophenylene and quinquephenylene segments) copolymer membranes, the incorporation of the third component, perfluoroalkylene groups, resulted in better water utilization for the proton conduction, while it did not alter the other properties such as gas permeability and mechanical strength. The selected membrane (SQF-3 with IEC = 2.56 mequiv g–1) exhibited high fuel cell performance under high- and low-humidity conditions with maximum power density reaching 0.97 W cm–2 at 100% RH (relative humidity) and 0.82 W cm–2 at 30% RH, respectively, at a curren..."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380847869729378562","@type":"Researcher","foaf:name":[{"@value":"Yaojian Zhang"}],"jpcoar:affiliationName":[{"@value":"Fuel Cell Nanomaterials Center, University of Yamanashi, 6-43 Miyamae, Kofu, Yamanashi 400-0021, 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