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    A novel inorganic proton exchange membrane based on self-assembled HPW-meso-silica for direct methanol fuel cells

    Access Status
    Fulltext not available
    Authors
    Lu, J.
    Tang, H.
    Lu, S.
    Wu, Hongwei
    Jiang, San Ping
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Lu, Jinlin and Tang, Haolin and Lu, Shanfu and Wu, Hongwei and Jiang, San Ping. 2011. A novel inorganic proton exchange membrane based on self-assembled HPW-meso-silica for direct methanol fuel cells. Journal of Materials Chemistry. 21 (18): pp. 6668-6676.
    Source Title
    Journal of Materials Chemistry
    DOI
    10.1039/c0jm03695a
    ISSN
    09599428
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/5265
    Collection
    • Curtin Research Publications
    Abstract

    Direct methanol fuel cells (DMFCs) based on high-temperature (100-300 C) proton exchange membranes (HT-PEMs) offer significant advantages over the current low-temperature DMFCs based on perfluorosulfonic acid (e.g., Nafion), such as reduction in CO poisoning via faster reaction kinetics, thus increasing the energy efficiency and reducing precious metal loading. This paper reports a novel inorganic proton exchange membrane based on 12-tungstophosphoric acid mesoporous silica (HPW-meso-silica) nanocomposites. The HPW-meso-silica was synthesized via a one-step selfassembly route assisted by a triblock copolymer, Pluronic P123, as the structure-directing surfactant. The threshold of the HPW content in the nanocomposites for the conductivity of mesoporous silica is 5 wt%. The best results were obtained at 25 wt% HPW-meso-silica, delivering a high proton conductivity of 0.091 S cm1 at 100 C under 100% relative humidity (RH) and 0.034 S cm1 at 200 C under 3% RH and a low activation energy of 14.0 kJ mol1. The maximum power density of a cell with a 25 wt% HPW-meso-silica membrane is 19 mW cm2 at 25 C and increased to 235 mW cm2 at 150 C in methanol fuel.

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