Anion conducting membranes for Energy Applications

Anion conducting membranes for Energy Applications
헨켄스마이어디억조형래Mateusz BrelaArtur MichalakCarolina Nunes KirchnerWiebke Germer고민재안치형김형준남석우
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[1], or with potassium hydroxide to show hydroxide conductivity[2]. 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[5]. 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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