As environmental issues such as global warming are deepening in the international society, researches on renewable energy are taking place to replace thermal energy sources. Among the new and renewable energies, researches on fuel cells are actively being carried out. Fuel cells are one-stage power ...
As environmental issues such as global warming are deepening in the international society, researches on renewable energy are taking place to replace thermal energy sources. Among the new and renewable energies, researches on fuel cells are actively being carried out. Fuel cells are one-stage power generation systems and have the highest efficiency among currently available power generation technologies. In order to commercialize fuel cells, many problems have to be solved. Among them, it is essential to develop membranes to replace Nafion®. In this study, synthesis and characterization of mixed membranes of sulfonated poly (vinylidene fluoride-co-hexafluoropropylene)(SPVDF-HFP) and sulfonated poly (aryleneethersulfone)(SPAES). The chemical properties, physical properties and performance were compared using analytical methods such as 1H–NMR, FT–IR, GPC, TGA, DSC, contact angle and mechanical stabilities. It was confirmed that the polymer was synthesized well through the structural analysis using 1H–NMR and FT–IR. In the thermogravimetric analysis, the decomposition of the sulfonic acid group starts at about 240℃, and the glass transition temperature obtained through the differential scanning calorimetry is 156℃ and thus it is considered to be thermally stable. The ionic conductivities were 68.9 mS/cm for SPAES/SPVDF-HFP-30 at 90℃ R.H. 100%. The SPAES / SPVDF-HFP-30 and SPAES / SPVDF-HFP-40 were 24 MPa and 30 MPa, respectively, meeting the 20 MPa requirement of the fuel cell after hybridization, although the mechanical stability of the SPAES membrane was low at 3.7 MPa. As a result, the hybridized SPAES/SPVDF-co-HFP membrane has good thermal stability, oxidation stability, and mechanical stability, and thus it is believed that more applications are possible in the development of polymer electrolyte membrane fuel cell membranes.
As environmental issues such as global warming are deepening in the international society, researches on renewable energy are taking place to replace thermal energy sources. Among the new and renewable energies, researches on fuel cells are actively being carried out. Fuel cells are one-stage power generation systems and have the highest efficiency among currently available power generation technologies. In order to commercialize fuel cells, many problems have to be solved. Among them, it is essential to develop membranes to replace Nafion®. In this study, synthesis and characterization of mixed membranes of sulfonated poly (vinylidene fluoride-co-hexafluoropropylene)(SPVDF-HFP) and sulfonated poly (aryleneethersulfone)(SPAES). The chemical properties, physical properties and performance were compared using analytical methods such as 1H–NMR, FT–IR, GPC, TGA, DSC, contact angle and mechanical stabilities. It was confirmed that the polymer was synthesized well through the structural analysis using 1H–NMR and FT–IR. In the thermogravimetric analysis, the decomposition of the sulfonic acid group starts at about 240℃, and the glass transition temperature obtained through the differential scanning calorimetry is 156℃ and thus it is considered to be thermally stable. The ionic conductivities were 68.9 mS/cm for SPAES/SPVDF-HFP-30 at 90℃ R.H. 100%. The SPAES / SPVDF-HFP-30 and SPAES / SPVDF-HFP-40 were 24 MPa and 30 MPa, respectively, meeting the 20 MPa requirement of the fuel cell after hybridization, although the mechanical stability of the SPAES membrane was low at 3.7 MPa. As a result, the hybridized SPAES/SPVDF-co-HFP membrane has good thermal stability, oxidation stability, and mechanical stability, and thus it is believed that more applications are possible in the development of polymer electrolyte membrane fuel cell membranes.
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