Polybenzimidazolium based solid electrolytes for fuel cell applications
- Polybenzimidazolium based solid electrolytes for fuel cell applications
- 헨켄스마이어디억; 조형래; 김형준; 임태훈
- anion exchange membrane; fuel cell; polybenzimidazolium; platinum free fuel cell
- Issue Date
- international conference on advanced electromaterials 2011
- Polybenzimidazoles are amphoteric polymers, which can can be doped with phosphoric acid to show proton conductivity, and with potassium hydroxide to show hydroxide conductivity.[2,3] For both systems, liquid water has to be avoided, to prevent the dopant from being leached out.
A third alternative are peralkylated polybenzimidazoles, which show a positive charge fixed on the polymer backbone and an exchangeable anion. The synthesis of permethylated PBI iodide was published by Hu et al. in 1994.
In this presentation, we show that hydroxide exchanged PBI is a potential material for anionic exchange membrane fuel cell membranes. The positive charge is highly delocalized over the imidazolium system and the phenyl ring in position 2. First experiments revealed a hydroxide conductivity of 29 mS/cm at 26°C and 58 mS/cm at 60°C for a methylated meta-PBI with 65% imidazolium and 35% imidazole groups.
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