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    Nafion®/ODF-silica composite membranes for medium temperature proton exchange membrane fuel cells

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    Type
    Article
    Authors
    Treekamol, Yaowapa
    Schieda, Mauricio
    Robitaille, Lucie
    MacKinnon, Sean M.
    Mokrini, Asmae
    Shi, Zhiqing
    Holdcroft, Steven
    Schulte, Karl I.
    Nunes, Suzana Pereira cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Nanostructured Polymeric Membrane Lab
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-01
    Permanent link to this record
    http://hdl.handle.net/10754/563318
    
    Metadata
    Show full item record
    Abstract
    A series of composite membranes were prepared by dispersing fluorinated polyoxadiazole oligomer (ODF)-functionalized silica nanoparticles in a Nafion matrix. Both melt-extrusion and solvent casting processes were explored. Ion exchange capacity, conductivity, water uptake and dimensional stability, thermal stability and morphology were characterized. The inclusion of functionalized nanoparticles proved advantageous, mainly due to a physical crosslinking effect and better water retention, with functionalized nanoparticles performing better than the pristine silica particles. For the same filler loading, better nanoparticle dispersion was achieved for solvent-cast membranes, resulting in higher proton conductivity. Filler agglomeration, however,was more severe for solvent-castmembranes at loadings beyond 5wt.%. The composite membranes showed excellent thermal stability, allowing for operation in medium temperature PEM fuel cells. Fuel cell performance of the compositemembranesdecreaseswithdecreasing relativehumidity, but goodperformance values are still obtained at 34% RHand 90 °C,with the best results obtained for solvent castmembranes loaded with 10 wt.% ODF-functionalized silica. Hydrogen crossover of the composite membranes is higher than that forpureNafion membranes,possiblydue toporosityresulting fromsuboptimalparticle- matrixcompatibility. © 2013 Crown Copyright and Elsevier BV. All rights reserved.
    Citation
    Treekamol, Y., Schieda, M., Robitaille, L., MacKinnon, S. M., Mokrini, A., Shi, Z., … Nunes, S. P. (2014). Nafion®/ODF-silica composite membranes for medium temperature proton exchange membrane fuel cells. Journal of Power Sources, 246, 950–959. doi:10.1016/j.jpowsour.2013.01.178
    Sponsors
    The authors would like to thank S. Neumann and Dr. T. Emmler for their contribution to the SEM, and thermal characterizations; F. Vachon, N. Raymond, and P. Le Marquand for their contribution to membrane and MEA processing and characterization. The authors gratefully acknowledge the funding provided by the NRC-Helmholtz Association Cooperation project on MEAs for high temperature fuel cells. Finally, the authors would like to acknowledge the editor's insightful comments.
    Publisher
    Elsevier BV
    Journal
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2013.01.178
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jpowsour.2013.01.178
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Water Desalination and Reuse Research Center (WDRC)

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