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    Constructing proton-conductive highways within an ionomer membrane by embedding sulfonated polymer brush modified graphene oxide

    Access Status
    Fulltext not available
    Authors
    Zhao, L.
    Li, Y.
    Zhang, H.
    Wu, W.
    Liu, Jian
    Wang, J.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhao, L. and Li, Y. and Zhang, H. and Wu, W. and Liu, J. and Wang, J. 2015. Constructing proton-conductive highways within an ionomer membrane by embedding sulfonated polymer brush modified graphene oxide. Journal of Power Sources. 286: pp. 445-457.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2015.04.005
    ISSN
    0378-7753
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/73437
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Elsevier B.V. All rights reserved. Abstract Sulfonated polymer brush modified graphene oxide (SP-GO) fillers with controllable brush length are synthesized via the facile distillation-precipitation polymerization, and then incorporated into sulfonated poly(ether ether ketone) (SPEEK) matrix to fabricate composite membranes. The influences of SP-GO upon the microstructures, including thermal and mechanical properties, water uptake/swelling, proton conduction, H<inf>2</inf> permeability and single PEMFC performances of composite membranes are intensively investigated. It is found that the SP-GO fillers are uniformly dispersed and tend to lie perpendicularly to the cross-section surface of the whole membrane, which allow SP-GO fillers creating inter-connected and broad ionic pathways through the sulfonic acid groups in polymer brushes. Meanwhile, the SP-GO fillers connect the ionic clusters in SPEEK matrix via interfacial interactions. In such a way, proton-transfer highways are constructed along the SPEEK/SP-GO interface, which lower the proton transfer activation energy and enhance the proton conductivities of the composite membranes under both hydrated and anhydrous conditions. Furthermore, elevating the brush length on SP-GO could further enhance the proton conductivity. Compared to SPEEK control membrane, a 95.5% increase in hydrated conductivity, an 178% increase in anhydrous conductivity and a 37% increase in maximum power density are obtained for the optimal composite membrane.

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