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http://dx.doi.org/10.5229/JKES.2009.12.3.245

Proton Conducting Membrane Based on Crosslinked Sulfonated Polyimide for Direct Methanol Fuel Cell  

Sung, Kyung-A (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Kim, Wan-Keun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Oh, Keun-Hwan (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Choo, Min-Ju (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Park, Jung-Ki (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Journal of the Korean Electrochemical Society / v.12, no.3, 2009 , pp. 245-250 More about this Journal
Abstract
Crosslinked membrane based on sulfonated polyimide was prepared by the introduction of crosslinkable monomer in polymerization process and crosslinking during membrane casting. Crosslinked membranes showed different properties from non-crosslinked membranes. Crosslinking decreased methanol crossover and therefore unit cell using crosslinked membrane showed increased open circuit voltage, 0.81 V, in comparison with unit cell using noncrosslinked membrane, 0.71 V. In addition, water uptake of crosslinked membrane, 40.5%, was lower than that of non-crosslinked membrane, 57.0%, and this resulted in improved dimensional stability. However, proton conductivity of crosslinked membranes showed rather low relative to non-crosslinked membrane due to reduced water uptake.
Keywords
Sulfonated polyimide; Crosslinking; Water uptake; Methanol crossover;
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