کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
194467 | 459792 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Fabrication and characterization of PFSI/ePTFE composite proton exchange membranes of polymer electrolyte fuel cells Fabrication and characterization of PFSI/ePTFE composite proton exchange membranes of polymer electrolyte fuel cells](/preview/png/194467.png)
PFSI/ePTFE composite proton exchange membranes were fabricated by impregnating perfluorosulfonic acid resin (PFSI resin, Nafion) into chemically modified expanded PTFE (ePTFE) matrix. Chemical modification of sodium–naphthalene treatment and N-methylol acrylamide (NMA) grafting decreased the contact angle of the as-received ePTFE from 125 ± 0.5° to 67 ± 0.5°, effectively converting the as-received hydrophobic ePTFE to a hydrophilic ePTFE matrix. The composite membrane fabricated with the hydrophilic ePTFE have higher impregnated PFSI loading, much lower porosity and better PTFE/PFSI interface contact, as compared to the composite membranes with the as-received ePTFE. This leads to much lower gas permeability and significantly improves the durability under an accelerated dry/wet cycle test. The fuel cell made from the PFSI/ePTFE composite membranes with hydrophilic ePTFE showed superior performance as compared to that with the composite membrane made from the as-received ePTFE and Nafion 211 membrane.
Journal: Electrochimica Acta - Volume 52, Issue 16, 30 April 2007, Pages 5304–5311