Cell Performance of the Membrane Electrode Assembly Based on Sulfonated-FEP/Nafion Blended Polymer
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The sulfonated poly (tetrafluoroethylene-co-hexafluoropropylene) (<I>s-FEP</I>) membranes were synthesized by electron beam (EB) induced grafting method and then milled to the powder. The <I>s-FEP</I>/Nafion<SUP>®</SUP> blended dispersion (<I>fn</I>) was prepared by mixing <I>s-FEP</I> powder with the Nafion<SUP>®</SUP> dispersion. The <I>s-FEP</I>/Nafion<SUP>®</SUP> blended membrane (<I>FN</I>) was obtained by casting the <I>fn</I> binder into the membrane. The membrane electrode assemblies (MEAs) were fabricated by using the proton exchange membranes (<I>FN</I> or Nafion<SUP>®</SUP> 112) and the Pt/C electrodes coated with the binders (fn or Nafion<SUP>®</SUP> dispersion) . The fuel cell performances of the MEAs were examined. The maximum power density of the MEA using <I>FN</I> membrane and <I>fn</I> binder (particle size of <I>s-FEP</I>: 48 ± 17 μm) was about 600 mW cm<SUP>-2</SUP>. This was higher performance than any other tested MEAs. It is considered that this is because the compatibility at the membrane-binder interfaces is improved and the thermophysical properties of the PEM and the binder are essentially the same due to basically the same material.
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