Study on PEFC membrane based on crosslinked FEP using EB-grafting

Akio Matsuura, Tomoyuki Kakigi, Yukiko Sato, Kazuki Fujii, Naohiro Mitani, Jingye Li, Akihiro Oshima, Masakazu Washio

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Polymer electrolyte fuel cell (PEFC) membranes based on crosslinked tetrafluoroethylene-co-hexafluoropropylene (FEP) have been fabricated by pre-irradiation grafting method. The chemical structures of crosslinked materials have been analyzed by Differential Scanning Calorimeter (DSC) and 19F solid-state Nuclear Magnetic Resonance (NMR) spectroscopy. The radical yields of irradiated samples were measued by Electron Spin Resonance (ESR), and the mechanism of grafting reaction has been discussed. The styrene grafted materials were sulfonated by chlorosulfonic acid. The ion exchange capacity of the obtained sulfonated crosslinked FEP (S-FEP-X) showed 2.0 to 2.4 meq/g, which were 2.2 to 2.7 times higher than that of Nafion®112. Class transition temperatures (Tg) of S-FEP-X were almost independent on crosslinking dose of FEP, and show about 96°C, which are slightly higher than that of Nafion®. The electrochemical properties of the membranes have been measured, and cell performances of them have been evaluated. Ionic conductivities (ICs) of S-FEP-X are 1.2 to 1.6 times higher than that of Nafion®. The higher network densities gave the higher open circuit voltage (OCV). The power density of S-FEP-6ookGy was about 10% higher than that of Nafion® at 500mA/cm2. Thus, the obtained sulfonated membranes can be expected to apply for high efficiency PEFC.

    Original languageEnglish
    Pages (from-to)221-227
    Number of pages7
    JournalMacromolecular Symposia
    Volume249-250
    DOIs
    Publication statusPublished - 2007

    Fingerprint

    Polytetrafluoroethylene
    Proton exchange membrane fuel cells (PEMFC)
    fuel cells
    electrolytes
    membranes
    Membranes
    magnetic resonance spectroscopy
    polymers
    Open circuit voltage
    crosslinking
    Ionic conductivity
    open circuit voltage
    Calorimeters
    Electrochemical properties
    styrenes
    Crosslinking
    ion currents
    Nuclear magnetic resonance spectroscopy
    Superconducting transition temperature
    calorimeters

    Keywords

    • Crosslinking
    • Electron beam irradiation
    • Polymer electrolyte fuel cell
    • Proton exchange membrane
    • Radiation grafting

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry

    Cite this

    Matsuura, A., Kakigi, T., Sato, Y., Fujii, K., Mitani, N., Li, J., ... Washio, M. (2007). Study on PEFC membrane based on crosslinked FEP using EB-grafting. Macromolecular Symposia, 249-250, 221-227. https://doi.org/10.1002/masy.200750336

    Study on PEFC membrane based on crosslinked FEP using EB-grafting. / Matsuura, Akio; Kakigi, Tomoyuki; Sato, Yukiko; Fujii, Kazuki; Mitani, Naohiro; Li, Jingye; Oshima, Akihiro; Washio, Masakazu.

    In: Macromolecular Symposia, Vol. 249-250, 2007, p. 221-227.

    Research output: Contribution to journalArticle

    Matsuura, A, Kakigi, T, Sato, Y, Fujii, K, Mitani, N, Li, J, Oshima, A & Washio, M 2007, 'Study on PEFC membrane based on crosslinked FEP using EB-grafting', Macromolecular Symposia, vol. 249-250, pp. 221-227. https://doi.org/10.1002/masy.200750336
    Matsuura A, Kakigi T, Sato Y, Fujii K, Mitani N, Li J et al. Study on PEFC membrane based on crosslinked FEP using EB-grafting. Macromolecular Symposia. 2007;249-250:221-227. https://doi.org/10.1002/masy.200750336
    Matsuura, Akio ; Kakigi, Tomoyuki ; Sato, Yukiko ; Fujii, Kazuki ; Mitani, Naohiro ; Li, Jingye ; Oshima, Akihiro ; Washio, Masakazu. / Study on PEFC membrane based on crosslinked FEP using EB-grafting. In: Macromolecular Symposia. 2007 ; Vol. 249-250. pp. 221-227.
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