Electrical properties of carbon-based polypropylene composites for bipolar plates in polymer electrolyte membrane fuel cell (PEMFC)

Radwan Dweiri, Jaafar Sahari

    Research output: Contribution to journalArticle

    106 Citations (Scopus)

    Abstract

    An investigation is made of the electrical properties of polypropylene/graphite (PP/G) composites as prospective replacements for the traditional graphite bipolar plate in proton-exchange membrane fuel cells. The composites have relatively low electrical conductivities, i.e., up to 28 S cm-1 at 90 wt.% G. Combination of G with carbon black (CB) is an effective way to develop higher conductivity composites. The conductivity reaches 35 S cm-1 by combination of 25 wt.% CB and 55 wt.% G to 20 wt.% PP. This is five times the value at 80 wt.% G and 20 wt.% PP (7 S cm-1). Two methods are mainly adopted for the preparation of composites, namely, melt compounding and solution blending. Solution blending of PP with conductive fillers followed by moulding of the dried powder leads to higher conductivities compared with those of melt-compounded composites. The combination of conjugated conducting polymers such as polyaniline (PANi) with the PP, G, and CB is also investigated. It is found that composites containing PANi have lower conductivities than those of the neat composites. This decrease in conductivity is attributed to the poor thermal stability of PANi.

    Original languageEnglish
    Pages (from-to)424-432
    Number of pages9
    JournalJournal of Power Sources
    Volume171
    Issue number2
    DOIs
    Publication statusPublished - 27 Sep 2007

    Fingerprint

    Polypropylenes
    Proton exchange membrane fuel cells (PEMFC)
    polypropylene
    fuel cells
    Electric properties
    Carbon
    electrical properties
    electrolytes
    membranes
    composite materials
    Soot
    carbon
    Composite materials
    polymers
    Polyaniline
    Carbon black
    conductivity
    Graphite
    graphite
    compounding

    Keywords

    • Bipolar plate
    • Carbon black
    • Composites
    • Graphite
    • Polyaniline
    • Proton-exchange membrane fuel cells

    ASJC Scopus subject areas

    • Electrochemistry
    • Fuel Technology
    • Materials Chemistry
    • Energy (miscellaneous)

    Cite this

    Electrical properties of carbon-based polypropylene composites for bipolar plates in polymer electrolyte membrane fuel cell (PEMFC). / Dweiri, Radwan; Sahari, Jaafar.

    In: Journal of Power Sources, Vol. 171, No. 2, 27.09.2007, p. 424-432.

    Research output: Contribution to journalArticle

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    abstract = "An investigation is made of the electrical properties of polypropylene/graphite (PP/G) composites as prospective replacements for the traditional graphite bipolar plate in proton-exchange membrane fuel cells. The composites have relatively low electrical conductivities, i.e., up to 28 S cm-1 at 90 wt.{\%} G. Combination of G with carbon black (CB) is an effective way to develop higher conductivity composites. The conductivity reaches 35 S cm-1 by combination of 25 wt.{\%} CB and 55 wt.{\%} G to 20 wt.{\%} PP. This is five times the value at 80 wt.{\%} G and 20 wt.{\%} PP (7 S cm-1). Two methods are mainly adopted for the preparation of composites, namely, melt compounding and solution blending. Solution blending of PP with conductive fillers followed by moulding of the dried powder leads to higher conductivities compared with those of melt-compounded composites. The combination of conjugated conducting polymers such as polyaniline (PANi) with the PP, G, and CB is also investigated. It is found that composites containing PANi have lower conductivities than those of the neat composites. This decrease in conductivity is attributed to the poor thermal stability of PANi.",
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