Structural and Morphological Features of Acid-Bearing Polymers for PEM Fuel Cells

Yunsong Yang, Ana Siu, Timothy J. Peckham, Steven Holdcroft

    Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review

    Abstract

    Chemical structure, polymer microstructure, sequence distribution, and morphology of acid-bearing polymers are important factors in the design of polymer electrolyte membranes (PEMs) for fuel cells. The roles of ion aggregation and phase separation in vinylic- and aromatic-based polymers in proton conductivity and water transport are described. The formation, dimensions, and connectivity of ionic pathways are consistently found to play an important role in determining the physicochemical properties of PEMs. For polymers that possess low water content, phase separation and ionic channel formation significantly enhance the transport of water and protons. For membranes that contain a high content of water, phase separation is less influential. Continuity of ionic aggregates is influential on the diffusion of water and electroosmotic drag within a membrane. A balance of these properties must be considered in the design of the next generation of PEMs.
    Original languageEnglish
    Title of host publicationFuel Cells I
    Volume215
    Place of PublicationBerlin
    PublisherSpringer
    Publication date2008
    Pages55-126
    DOIs
    Publication statusPublished - 2008
    SeriesAdvances in Polymer Science
    Number215

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