Anion conducting membranes for Energy Applications
- Anion conducting membranes for Energy Applications
- 헨켄스마이어디억; 조형래; Mateusz Brela; Artur Michalak; Carolina Nunes Kirchner; Wiebke Germer; 고민재; 안치형; 김형준; 남석우
- anion exchange membrane; polybenzimidazole; PBI; solar cell; carbon capture; fuel cell
- Issue Date
- ISPE 13 Internatiponal Symposium on Polymer electrolytes
- Polybenzimidazoles (PBI) are amphoteric polymers. For the use in fuel cells, they can be doped with phosphoric acid to show proton conductivity, or with potassium hydroxide to show hydroxide conductivity. For both systems, liquid water has to be avoided, to prevent the dopant from leaching out.
Dopant loss is prevented in permethylated polybenzimidazoles, which show a positive charge fixed on the polymer backbone and an exchangeable anion[3,4]. Hydroxide exchanged membranes are of interest for alkaline anion exchange membrane fuel cells, (bi)carbonate exchanged membranes open the way to electrochemical CO2 pumping for CCU/CCS applications, and triiodide exchanged polymers can be used in the dye sensitized solar cell (DSSC).
The positive charge is delocalized over the imidazolium system and the phenyl ring in position 2, and enlarging the conjugated system reduces the positive charge on the imidazolium system. Hydroxide exchanged membranes still lack stability and tend to form chemical bonds between C2 and hydroxide. However, a high bicarbonate conductivity of 31 mS/cm was achieved at fully humidified conditions at 65°C for PBI-OO showing a degree of methylation of 73%. A DSSC employing triiodide exchanged PBI-OO showed an efficiency of 5.9%, measured at AM 1.5 G, 1sun light intensity.
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