Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 323, Issue 2, Pages 404-413Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2008.06.051
Keywords
direct methanol fuel cell; proton exchange membrane; sulfonated poly(ether ether ketone); charged surface modifying macromolecule; blend membrane
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Funding
- Natural Science and Engineering Research Council of Canada
- Ministry of the Environment, Ont., Canada
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Modification of sulfonated poly(ether ether ketone) (SPEEK) membrane was attempted by blending charged surface modifying macromolecule (cSMM). The modified membrane was tested for direct methanol fuel cell (DMFC) application; i.e. a SPEEK/cSMM blend membrane was compared to a SPEEK membrane and a Nafion 112 membrane for the thermal and mechanical stability, methanol permeability, and proton conductivity. Thermal and mechanical stability of the blended membrane were slightly reduced from the SPEEK membrane but still higher than the Nafion 112 membrane. The blend membrane was found to be promising for DMFC applications because of its lower methanol diffusivity (2.75 x 10(-7) cm(2) s(-1)) and higher proton conductivity (6.4 x 10(-3) Scm(-1)), than the SPEEK membrane. A plausible explanation was given for the favorable effect of cSMM blending. (C) 2008 Elsevier B.V. All rights reserved.
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