Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14365/769
Title: Effect of Polymer Sulfonation on the Proton Conductivity and Fuel Cell Performance of Polyvinylalcohol-Mordenite Direct Methanol Fuel Cell Membranes
Authors: Uctug, Fehmi Gorkem
Nijem, Jinan
Keywords: direct methanol fuel cells
mordenite
polymer-zeolite membranes
polyvinylalcohol
proton conductivity
sulfonation
Mixed Matrix Membranes
Exchange Membranes
Composite Membranes
Carbon Nanotubes
Nafion(R)
Permeability
Fabrication
Water
Publisher: Wiley
Abstract: Sulfonated polyvinylalcohol-mordenite (SPVA-MOR) membranes for direct methanol fuel cell use were synthesized and characterized. It had earlier been found out that polyvinylalcohol-mordenite (PVA-MOR) membranes, while having excellent methanol permeability and modest proton conductivity values, had inferior direct methanol fuel cell performances than Nafion(TM). Sulfonating the polyvinylalcohol matrix had been suggested to improve the proton conductivity. In this work, polyvinylalcohol powder was sulfonated by using propane sultone as the sulfonating agent prior to the membrane synthesis. Morphological analyses revealed that the zeolite particles mixed homogeneously within the polymer matrix. Sulfonating the polymer slightly decreased both water and methanol uptakes. Both in PVA-MOR and SPVA-MOR membranes, water uptake turned out to be higher than the methanol uptake. SPVA-MOR membranes were found to have an average proton conductivity of 0.052 S center dot cm(-1) when compared with the 0.036 S center dot cm(-1) of PVA-MOR membranes, while Nafion has a proton conductivity of approximately 0.1 S center dot cm(-1). The increase in the proton conductivity upon sulfonation despite the decrease in water uptake was explained by the dominance of the Grotthuss mechanism over the vehicular mechanism for proton conductivity. Fuel cell test results showed that while SPVA-MOR membranes cannot outperform Nafion(TM), they give higher power output than PVA-MOR membranes, especially at low temperatures and high methanol concentrations. (c) 2017 Curtin University of Technology and John Wiley & Sons, Ltd.
URI: https://doi.org/10.1002/apj.2105
https://hdl.handle.net/20.500.14365/769
ISSN: 1932-2135
1932-2143
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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