Anion conducting PBI based membranes for energy applications

Anion conducting PBI based membranes for energy applications
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,[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 carbonate based systems, and the use of iodide exchanged membranes for DSSC was proposed[4]. 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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