Enhanced transport properties in polymer electrolyte composite membranes with graphene oxide sheets

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Polymer electrolyte membranes have been widely investigated for high performance fuel cells. Here, we report the synthesis of ionic conductive Nafion/graphene oxide (GO) composite membranes for application in direct methanol fuel cells. GOs interact with both the non-polar backbone and the polar ionic clusters of Nafion because of their amphiphilic characteristics attributable to hydrophobic conjugation and hydrophilic functional groups. Accordingly, GO sheets serve to modify the microstructures of two domains of Nafion. In particular, the transport properties of Nafion are favorably manipulated by the incorporation of GO. This modulated the ionic channels of Nafion and decrease methanol crossover while preserving ionic conductivity. Furthermore, strong interfacial interactions due to the insertion of GO nanofillers into the Nafion matrix improve the thermal and mechanical properties of the material. In particular, we exploit Nafion/GO composite membrane as electrolyte material for direct methanol fuel cell (DMFC) in order to resolve current issue of methanol crossover. This composite membrane-based DMFC compared to the Nafion 112-based DMFC remarkably enhanced cell performance, especially in severe operating conditions. (C) 2012 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-12
Language
English
Article Type
Article
Keywords

PROTON-EXCHANGE-MEMBRANE; METHANOL FUEL-CELLS; ANGLE X-RAY; NANOCOMPOSITE MEMBRANES; STATE; NAFION; DMFC; NMR; CONDUCTIVITY; MORPHOLOGY

Citation

CARBON, v.50, no.15, pp.5395 - 5402

ISSN
0008-6223
DOI
10.1016/j.carbon.2012.07.025
URI
http://hdl.handle.net/10203/104129
Appears in Collection
CBE-Journal Papers(저널논문)
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