Chemical modification of Nafion membrane with 3,4-ethylenedioxythiophene for direct methanol fuel cell application |
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Authors: | Lei Li Yongming Zhang |
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Affiliation: | School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract: | Nafion 117 membranes were modified by in situ chemical polymerization of 3,4-ethylenedioxythiophene using H2O2 as oxidant for direct methanol fuel cell application. Methanol permeability and proton conductivity of the poly(3,4-ethylenedioxythiophene)-modified Nafion membranes as a function of temperature were investigated. An Arrhenius-type dependency of methanol permeability and proton conductivity on temperature exists for all the modified membranes. Compared with Nafion 117 membrane at 60 °C, the methanol permeability of these modified membranes is reduced from 30% to 72%, while the proton conductivity is decreased from 4% to 58%, respectively. Because of low methanol permeability and adequate proton conductivity, the DMFC performances of these modified membranes were better than that of Nafion 117 membrane. A maximum power density of 48.4 mW cm−2 was obtained for the modified membrane, while under same condition Nafion 117 membrane got 37 mW cm−2. |
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Keywords: | Poly(3,4-ethylenedioxythiophene) Proton conductivity Methanol permeability Direct methanol fuel cell Membrane |
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