Aquivion® PFSA (perfluorosulfonic acid) ionomer membranes, dispersions and other perfluorinated product forms are key enablers for electrical storage and conversion devices, such as fuel cells, electrolyzers and flow batteries used in conjunction with zero-emission electricity sources.
Solvay’s Aquivion® portfolio offers the industry's broadest range of PFSA compositions and product forms, which includes ionomer membranes, dispersions, powders and melt-processable pellets. These innovative materials are based on the Short Side Chain (SSC) copolymer of Tetrafluoroethylene (TFE) and Sulfonyl Fluoride Vinyl Ether (SFVE) F2C=CF-O-CF2CF2-SO2F.
Aquivion® Product Forms
- Membranes (PFSA)
- Dispersions (PFSA, PFSO3Li)
- Powders (PFSA, PFSO3Li)
- Pellets (PFSF)
PFSO3Li represents the lithium salt form (-SO3Li) of PFSA.
PFSF (perfluorosulfonic fluoride) pellets, due to a sulfonyl fluoride group (-SO2F), are the only product forms that can be melt extruded and then successively converted into the ionic (-SO3H) PFSA form.
- Very high concentration of functional groups for strong proton (or Na+, K+, Li+) conductivity
- High softening point for high-temperature operation well above 80°C
- Strong water retention for better low-humidity fuel cell operation
Aquivion® PFSA’s shorter side chain makes it possible to achieve either better mechanical properties at the same IEC (ion-exchange capacity) or a higher IEC at the same mechanical properties than long side chain polymers (LSC).
Comparison of short side chain (SSC) and long side chain (LSC) ionomers
Measurements made using Perkin-Elmer DSC7 Calorimeter