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Synthesis and Ion Conducting Properties of Anion Exchange Membranes Based on PBI Copolymers for Alkaline Fuel Cells  

Lee, Dong-Hoon (Fuel Cell Center, Korea Institute of Science and Technology)
Kim, Se-Jong (School of Materials Science and Engineering, Engineering Research Institute, I-Cube Center, Gyeongsang National University)
Nam, Sang-Yong (School of Materials Science and Engineering, Engineering Research Institute, I-Cube Center, Gyeongsang National University)
Kim, Hyonng-Juhn (Fuel Cell Center, Korea Institute of Science and Technology)
Publication Information
Membrane Journal / v.20, no.3, 2010 , pp. 217-221 More about this Journal
Abstract
In order to overcome the drawback of proton exchange membrane fuel cells (PEMFCs), solid alkalime membrane fuel cells (SAMFCs) have been studied. In this report, we synthesized new sulfonated polybenzimidazole derivatives for SAMFCs. The polyimidazole derivatives were doped by KOH, and base-doped polybenzimidazoles showed high hydroxy ion conductivity and excellent mechanical properties. Especially, sPBI-co-PBI (75 : 25 for molar ratio of sulfonated and non-sulfonated moiety) showed good possibility for the anion exchange membrane. It has $2.98{\times}10^{-2}\;S/cm$ at $90^{\circ}C$ under 100% relative humidity.
Keywords
solid alkalime membrane fuel cell; anion exchange membrane; conductivity; polybenzimidazole;
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