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    Correlation between proton conductivity, thermal stability and structural symmetries in novel HPW-meso-silica nanocomposite membranes and their performance in direct methanol fuel cells

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    Fulltext not available
    Authors
    Zeng, J.
    Shen, P.
    Lu, S.
    Xiang, Y.
    Li, L.
    De Marco, Roland
    Jiang, San Ping
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Zeng, Jie and Shen, Pei Kong and Lu, Shanfu and Xiang, Yan and Li, Lin and De Marco, Roland and Jiang, San Ping. 2012. Correlation between proton conductivity, thermal stability and structural symmetries in novel HPW-meso-silica nanocomposite membranes and their performance in direct methanol fuel cells. Journal of Membrane Science 397-398: pp. 92-101.
    Source Title
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2012.01.018
    ISSN
    03767388
    URI
    http://hdl.handle.net/20.500.11937/17287
    Collection
    • Curtin Research Publications
    Abstract

    The intrinsic relationship between proton conductivity, thermal stability and structural symmetries of phosphotungstic acid (HPW)-functionalized mesoporous silica (HPW-meso-silica) membrane was investigated with mesoporous silica from 2D hexagonal p6mm, 3D face-centered cubic (Fm¯3m), body-centered Im¯3m, to cubic bicontinuous Ia¯3d symmetries. HPW-meso-silica nanocomposites with 3D mesostructures display a significantly higher proton conductivity and higher stability as a function of relative humidity in comparison to 2D mesostructures. The best result was obtained with body-centered cubic (Im¯3m)-HPWmeso-silica, showing proton conductivities of 0.061 S cm-1 at 25°C and 0.14 S cm-1 at 150°C, respectively, and an activation energy of 10.0 kJ mol-1. At 150°C, the cell employing a HPW-meso-silica membrane produced a maximum power output of 237 mW cm-2 in a methanol fuel without external humidification. The high proton conductivity and excellent performance of the new methanol fuel cells demonstrate the promise of HPW-meso-silica nanocomposites with 3D mesostructures as a new class of inorganic proton exchange membranes for use in direct methanol fuel cells (DMFCs).

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