Anion conducting PBI based membranes for energy applications
- Anion conducting PBI based membranes for energy applications
- 헨켄스마이어디억; 조형래; 김형준; 남석우
- Anion Exchange membrane; Fuel Cell; DSSC
- Issue Date
- The 7th Conference of Aseaninan Membrane Society
- 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 carbonate based systems, and the use of iodide
exchanged membranes for DSSC was proposed.
The positive charge is delocalized over the imidazolium system and the phenyl ring in position
2. Apparently, the hydrolytic stability of the system can be increased by incorporation of
phenoxygroups.[5,6] While hydroxide exchanged membranes still lack some stability and
tend to form conjugated bonds between C2 and hydroxide, high carbonate and bicarbonate
conductivities of 20 and 31 mS/cm, respectively, were achieved at fully humidified conditions
at 65°C for PBI-OO showing a degree of methylation of 73%.
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