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Nafion/poly(vinyl alcohol) nano-fiber composite and Nafion/poly(vinyl alcohol) blend membranes for direct methanol fuel cells

Lin, H. L.; Wang, S. H.

Journal of membrane science. VOL 452, ; 2014, 253-262 -- Elsevier Science B.V., Amsterdam. Part; (pages 253-262) -- 2014

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  • Title:
    Nafion/poly(vinyl alcohol) nano-fiber composite and Nafion/poly(vinyl alcohol) blend membranes for direct methanol fuel cells
  • Author: Lin, H. L.;
    Wang, S. H.
  • Found In: Journal of membrane science. VOL 452, ; 2014, 253-262
  • Journal Title: Journal of membrane science.
  • Subjects: Chemical Engineering and Technology; Pharmaceutical Chemistry; Environment; LCC: TP159; Dewey: 660.28424
  • Publication Details: Elsevier Science B.V., Amsterdam.
  • Language: English
  • Abstract: The poly(vinyl alcohol) (PVA) electrospun nano-fiber film supported Nafion resin composite (N/VA-f) membranes as well as the PVA blended in Nafion (N/VA-b) cast membranes are prepared and used for direct methanol fuel cell (DMFC) applications. The morphologies, conductivities, methanol permeability, and DMFC performances of these membranes are studied and compared with the commercial Nafion-117 (thickness ~175μm) and Nafion-212 (thickness ~50μm) membranes. We show that the membranes with a thickness of ~50μm have an optimum PVA contents of ~10wt% and ~5wt% for both N/VA-f and N/VA-b membranes, respectively, for DMFC applications. The unit cell tests demonstrate the DMFC performance decreases with following sequence N/VA-f>N/VA-b>Nafion-117>Nafion-212. Using scanning electron microscopy and energy dispersion X-ray analyses, we show that PVA fiber film distributes in the middle plane of the N/VA-f membrane. However, agglomeration and non-homogeneous distribution of PVA are observed in the N/VA-b membrane. The more straight and less tortuous proton traveling pathway around the PVA fiber in the N/VA-f membrane than around the large PVA agglomeration domain in the N/VA-b membrane leads N/VA-f to have a higher proton conductivity optimum PVA content and better DMFC performance than the N/VA-b membrane.
  • Identifier: Journal ISSN: 0376-7388
  • Publication Date: 2014
  • Physical Description: Electronic
  • Shelfmark(s): 5017.620000
  • UIN: ETOCRN344793576

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