Crosslinked polymer electrolytes of high pyridine contents for HT-PEM fuel cells |
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| Affiliation: | 1. Department of Chemistry, University of Patras, University Campus, Rio-Patras, GR26504, Greece;2. Foundation for Research and Technology Hellas/Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Platani Str., Patras, GR26504, Greece;1. Teksis İleri Teknolojiler Ltd. Sti, MetuTech, 06800, Ankara, Turkey;2. Department of Energy System Engineering, Atılım University, 06836, Incek, Ankara, Turkey;1. Helmholtz Institute Ulm (HIU), Karlsruhe Institute of Technology (KIT), Helmholtzstrasse 11, 89081, Ulm, Germany;2. Karlsruhe Institute of Technology (KIT), Institute of Applied Materials, Hermann-von Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany;3. University of Stuttgart, Institute of Chemical Process Engineering, Böblinger Strasse 78, 70199, Stuttgart, Germany;4. Karlsruhe Institute of Technology (KIT), Institute of Physical Chemistry, Fritz Haber Weg 2, 76131, Karlsruhe, Germany;5. North-West University, Potchefstroom Campus, Chemical Resource Beneficiation, Potchefstroom, South Africa;1. Korea Institute of Science and Technology, Fuel Cell Research Center, Hwarangno 14-gil 5, 02792 Seoul, Republic of Korea;2. Proton Conductors, DTU Energy, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark;3. University of Science and Technology, 217 Gajungro, Yuseonggu, Daejeon, Republic of Korea;4. Green School, Korea University, Seoul 136-713, Republic of Korea |
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| Abstract: | This report evaluates a new family of pyridine containing aromatic polyether sulfones as polymer electrolytes for high temperature polymer electrolyte membrane fuel cells (HTPEM FCs). The polymers are prepared by high temperature polyetherification reactions, yielding highly soluble polymers even with pyridine contents as high as 90%. Along with the pyridine content, crosslinking density is also tuned, leading to the enhancement of membrane properties such as film integrity, dimensional stability and doping ability in acidic media. The completion of the crosslinking reaction is enabled by a short thermal pre-treatment, preceding the doping step in H3PO4 85%. Both the linear and the crosslinked membranes show high thermal and oxidative stability. Membranes before and after crosslinking are integrated in single cells where their conductivity and performance are monitored, revealing conductivities above 7 × 10−2 S/cm at temperatures higher than 180 °C. |
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| Keywords: | High temperature polymer electrolyte membranes Polyether sulfones Pyridine Double bonds Crosslinking Fuel cells |
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