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• W2069989307 abstract "Experimental methods for studying the conductivity and methanol permeability of proton conductive polymers over a wide range of temperatures have been developed. The proton conductivity and methanol permeability of several polymer electrolyte membranes including sulfonated and phosphonated poly[(aryloxy)phosphazenes] was determined at temperatures up to 120 °C. Nafion 117 membranes were tested using the same methods in order to determine the reliability of the methods. Although the conductivities of the polyphosphazene membranes were either similar to or lower than that of the Nafion 117 membranes, they continue to hold promise for fuel cell applications. We observed similar activation energies of proton conduction for Nafion 117, and for sulfonated and phosphonated polyphosphazene membranes. However, the methanol permeability of a sulfonated membrane was about 8 times lower than that of the Nafion 117 membrane at room temperature although the values were comparable at 120 °C. The permeability of a phosphonated phosphazene derivative was about 40 times lower than that of the Nafion 117 membrane at room temperature and about 9 times lower at 120 °C. This is a significant improvement over the behavior of Nafion 117." @default.
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• W2069989307 date "2003-06-01" @default.
• W2069989307 modified "2023-10-08" @default.
• W2069989307 title "High temperature transport properties of polyphosphazene membranes for direct methanol fuel cells" @default.
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• W2069989307 doi "https://doi.org/10.1016/s0013-4686(03)00201-9" @default.
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