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- W2018289098 abstract "Abstract Perfluorosulfonic acid (PFSA) electrolyte heat-treated at elevated glass transition temperature (Tg, 140–290 °C) with alkaline metal ions as the sulfonic group protector have been used to prepare stable PFSA/polytetrafluoroethylene (ePTFE) polymer electrolyte membrane for fuel cells. Thermal mechanical analysis (TMA) and X-ray diffraction results revealed that the PFSA resin with alkaline metal ions (Li, Na, and K) exhibits a significant increase of Tg, as well as an improved crystalline structure after heat treatment at Tg. Resin solubility measurement indicated the heat-treated PFSA show a better solvent resistance which favors membrane stability. The effect of ionic modification on PFSA/ePTFE composite PEMs performances, such as gas crossover, shrinkage stress, proton conductivity, and mechanical properties has been investigated in details. In general, the heat-treated PFSA/ePTFE composite PEMs showed lower dissolved fraction in water–alcohol solvents and better dimensional stability. The increased heat-treated temperature also enhanced the membrane performance because of the improved interface compatibility between PFSA resin and PTFE. The PFSA/ePTFE membrane prepared from heat-treated PFSA in Na-form at 290 °C (Tg of Na-form PFSA) increased the performance up to 0.744 V@600 mA cm−2, significantly higher than those of other PEMs because of the Tg of Na-PFSA were close to the Tg of PTFE." @default.
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- W2018289098 date "2011-09-01" @default.
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- W2018289098 title "Durable perfluorosulfonic polymer electrolyte membranes prepared from alkaline-ion-assisted heat treatment" @default.
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- W2018289098 doi "https://doi.org/10.1016/j.memsci.2011.05.058" @default.
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