Abstract
Proton exchange membranes (PEMs) are one of the key materials in low-temperature fuel cells; proton exchange membrane fuel cells (PEMFCs); and direct 35 methanol fuel cells (DMFCs).
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Abbreviations
- Hydrocarbon ionomers:
-
Polymers with hydrocarbon backbone (and generally no fluorine groups) and acidic functions.
- Hydrophilic/hydrophobic phase separation:
-
Phase-separated morphology of ionomer membranes based on the differences in the hydrophilicity (and hydrophobicity) of the components.
- Ion exchange capacity:
-
Amount of acidic or ion-exchangeable sites per weight or volume unit of ionomer membranes, often abbreviated as IEC. EW (equivalent weight, or weight of ionomer membranes per acidic or ion-exchangeable site) is a reciprocal of IEC.
- Ionomers:
-
Originally defined as copolymers having one ionic group per polymer repeating unit, where composition of ion-containing copolymer unit is less than 20%. Nowadays, often used to be synonymous with polymer electrolytes.
- Ionic channels:
-
Network of acidic groups and water molecules, through which proton and/or hydronium ions can migrate.
- Perfluoro sulfonic acid ionomers:
-
Copolymers composed of poly(tetrafluoroethylene) and poly(trifluoroethylene) with perfluoro sulfonic acid ether side chains.
- Proton exchange membranes:
-
Membranes that can exchange protons with other cations or that can transport protons.
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Miyatake, K. (2013). Membrane Electrolytes, from Perfluoro Sulfonic Acid (PFSA) to Hydrocarbon Ionomers. In: Kreuer, KD. (eds) Fuel Cells. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5785-5_7
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