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    Constructing Ionic Liquid-Filled Proton Transfer Channels within Nanocomposite Membrane by Using Functionalized Graphene Oxide

    Access Status
    Fulltext not available
    Authors
    Wu, W.
    Li, Y.
    Chen, P.
    Liu, Jian
    Wang, J.
    Zhang, H.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Wu, W. and Li, Y. and Chen, P. and Liu, J. and Wang, J. and Zhang, H. 2016. Constructing Ionic Liquid-Filled Proton Transfer Channels within Nanocomposite Membrane by Using Functionalized Graphene Oxide. ACS Applied Materials and Interfaces. 8 (1): pp. 588-599.
    Source Title
    ACS Applied Materials and Interfaces
    DOI
    10.1021/acsami.5b09642
    ISSN
    1944-8244
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/71974
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 American Chemical Society. Herein, nanocomposite membranes are fabricated based on functionalized graphene oxides (FGOs) and sulfonated poly(ether ether ketone) (SPEEK), followed by being impregnated with imidazole-type ionic liquid (IL). The functional groups (acidic group or basic group) on FGOs generate strong interfacial interactions with SPEEK chains and then adjust their motion and stacking. As a result, the nanocomposite membranes possess tunable interfacial domains as determined by its free volume characteristic, which provides regulated location for IL storage. The stored ILs act as hopping sites for water-free proton conduction along the FGO-constructed interfacial channels. The microstructure at SPEEK-FGO interface governs the IL uptake and distribution in nanocomposite membrane. Different from GO and vinyl imidazole functionalized GO (VGO), the presence of acidic (-SO3H) groups confers the p-styrenesulfonic acid functionalized GO (SGO) incorporated nanocomposite membrane loose interface and strong electrostatic attraction with imidazole-type IL, imparting an enhanced IL uptake and anhydrous proton conductivity. Nanocomposite membrane containing 7.5% SGO attains the maximum IL uptake of 73.7% and hence the anhydrous conductivity of 21.9 mS cm-1at 150 °C, more than 30 times that of SPEEK control membrane (0.69 mS cm-1). In addition, SGOs generate electrostatic attractions to the ILs confined within SGO-SPEEK interface, affording the nanocomposite membrane enhanced IL retention ability.

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