The effect of water uptake gradient in membrane electrode assembly on fuel cell performance

H. Fujita, F. Shiraki, Y. Oshima, T. Tatsumi, T. Yoshikawa, T. Sasaki, A. Oshima, Masakazu Washio

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Novel proton exchange membranes (PEMs) with functionally gradient ionic sites were fabricated utilizing low energy electron beam (EB) irradiations. The low energy electron beam irradiation to polymer membranes possessed the property of gradient energy deposition in the membrane thickness direction. In the process of EB grafting of styrene onto base films, selective ranges of the gradient energy deposition were used. Micro FT-IR spectra showed that the simulated energy deposition of EB irradiation to base polymer membranes in the thickness direction corresponded to the amount of styrene grafted onto EB-irradiated films. After sulfonation, a functionally gradient ionic site PEM (gradient-PEM) was prepared, corresponding to EB depth-dose profile. The functionally gradients of ionic sites in the gradient-PEM and flat-PEM were evaluated with XPS and SEM-EDX. The results of XPS and SEM-EDX suggest that the prepared gradient-PEM had a gradient sulfonated acid groups. In addition, the polarization performance of MEA based on gradient-PEM was improved in high current density. It was thought that water uptake gradient could have a function to prevent flooding in the MEA during FC operation. Thus, the functionally gradient-PEMs could be a promising solution to manage the water behavior in MEA.

    Original languageEnglish
    Pages (from-to)201-206
    Number of pages6
    JournalRadiation Physics and Chemistry
    Volume80
    Issue number2
    DOIs
    Publication statusPublished - 2011 Feb

    Fingerprint

    fuel cells
    assembly
    membranes
    gradients
    electrodes
    water
    electron beams
    protons
    styrenes
    irradiation
    energy
    scanning electron microscopy
    polymers
    high current
    current density
    dosage
    acids
    polarization
    profiles

    Keywords

    • Functionally gradient
    • Low energy EB
    • PEFC
    • PEM
    • Radiation grafting

    ASJC Scopus subject areas

    • Radiation

    Cite this

    The effect of water uptake gradient in membrane electrode assembly on fuel cell performance. / Fujita, H.; Shiraki, F.; Oshima, Y.; Tatsumi, T.; Yoshikawa, T.; Sasaki, T.; Oshima, A.; Washio, Masakazu.

    In: Radiation Physics and Chemistry, Vol. 80, No. 2, 02.2011, p. 201-206.

    Research output: Contribution to journalArticle

    Fujita, H, Shiraki, F, Oshima, Y, Tatsumi, T, Yoshikawa, T, Sasaki, T, Oshima, A & Washio, M 2011, 'The effect of water uptake gradient in membrane electrode assembly on fuel cell performance', Radiation Physics and Chemistry, vol. 80, no. 2, pp. 201-206. https://doi.org/10.1016/j.radphyschem.2010.07.033
    Fujita, H. ; Shiraki, F. ; Oshima, Y. ; Tatsumi, T. ; Yoshikawa, T. ; Sasaki, T. ; Oshima, A. ; Washio, Masakazu. / The effect of water uptake gradient in membrane electrode assembly on fuel cell performance. In: Radiation Physics and Chemistry. 2011 ; Vol. 80, No. 2. pp. 201-206.
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