Behavior of Water below the Freezing Point in PEFCs

Ishikawa, Yuji; Morita, Tohru; Shiozawa, Masahiro

doi:10.1149/ma2006-02/8/421

Cited by 1 publication

(1 citation statement)

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“…58,214,264,309,310 The shift of freezing point to a lower temperature compared to the melting transition is associated with the supercooling phenomenon of water, as detected through various means. 58,264,309,320,723 In a few DSC studies, higher temperature peaks around 275 to 350 °C were also reported, 38,40,229 and associated with the melting of the crystallites, in accordance with WAXS investigations. 33,36,82,108 Nevertheless, due to its chemically heterogeneous structure, PFSA has a lower melting point and broader transition temperature compared to PTFE.…”

Section: Thermal-mechanical Transitionsmentioning

confidence: 99%

New Insights into Perfluorinated Sulfonic-Acid Ionomers

2017

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In this comprehensive review, recent progress and developments on perfluorinated sulfonic-acid (PFSA) membranes have been summarized on many key topics. Although quite well investigated for decades, PFSA ionomers' complex behavior, along with their key role in many emerging technologies, have presented significant scientific challenges but also helped create a unique cross-disciplinary research field to overcome such challenges. Research and progress on PFSAs, especially when considered with their applications, are at the forefront of bridging electrochemistry and polymer (physics), which have also opened up development of state-of-the-art in situ characterization techniques as well as multiphysics computation models. Topics reviewed stem from correlating the various physical (e.g., mechanical) and transport properties with morphology and structure across time and length scales. In addition, topics of recent interest such as structure/transport correlations and modeling, composite PFSA membranes, degradation phenomena, and PFSA thin films are presented. Throughout, the impact of PFSA chemistry and side-chain is also discussed to present a broader perspective.

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