Gel electrolytes of covalent network polybenzimidazole and phosphoric acid by direct casting
- Gel electrolytes of covalent network polybenzimidazole and phosphoric acid by direct casting
- 헨켄스마이어디억; Andreas Kirkebæk; David Aili; Jens Oluf Jensen; Qingfeng Li
- direct casting; fuel cell; HT-PEMFC; polybenzimidazole; polymer electrolyte
- Issue Date
- Macromolecular materials and engineering
- VOL 302, NO 12-7
- Polybenzimidazole membranes imbibed with phosphoric acid can support high proton conductivity at 120– 200 °C, and have therefore emerged as the state-of-the-art electrolytes for fuel cells operating in this temperature range. This work presents a novel and operationally simple methodology for preparing mechanically robust covalent network polybenzimidazole membranes containing up to 95 wt% phosphoric acid. Diamino-terminal pre-polymers of different chain lengths are first prepared, followed by addition of a trifunctional carboxylic acid. The crude solutions are cast and subsequently heat treated at up to 230 °C, yielding free-standing membranes of networked polybenzimidazole with high proton conductivity at up to 180 °C and encouraging fuel cell performance.
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