Synthesis and Applications for High-Temperature Fuel Cells of Anhydride Proton Conducting Polymers

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1. Development of Anhydrous Proton Conducting PolymersHydrocarbon based polymer electrolytes with amino groups were synthesized. We established a method that was the introduction of amino groups to polysulfone and polyphenylene derivatives and prepared several kinds of basic polymer electrolytes. The acid-base complex type electrolytes were obtained by investigating the phosphoric acid doping to the basic polymer electrolytes. The high-temperature PEFC with these acid-base complex type electrolytes could be operated at 120-160℃ and exhibited high power density of 200 mWcm^<-2>. New doping methods with other acid materials were also examined.2. Development of Technology for High-Temperature PEFCWe investigated the catalytic layer that was a very important subject for high-temperature PEFCs on 2005. Nafion solution, Nafion/phosphoric acid complex, polybenzimidazole/phosphoric acid complex, sulfonated fullerene, sulfonated conducting polymers were prepared as the binder material for the catalytic layer, and membrane-electrode assemblies (MEA) were fabricated with these binder materials. The result of high-temperature PEFC operation tests showed that the Nafion/phosphoric acid complex was the most suitable binder compared with the others. In addition, these binder materials were utilized for conventional PEFC tests. The experimental data suggested that the sulfonated fullerene binder had better performance than those of the other binders. This effect may be due to the anhydrous proton conduction in the sulfonated fullerene binder. The sulfonated fullerene binder also exhibited a radical quench effect on the PEFC durability tests.