Journal article
Gel Electrolytes of Covalent Network Polybenzimidazole and Phosphoric Acid by Direct Casting
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
Language: | English |
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Year: | 2017 |
ISSN: | 14392054 and 14387492 |
Types: | Journal article |
DOI: | 10.1002/mame.201700347 |
ORCIDs: | Aili, David , Jensen, Jens Oluf , Li, Qingfeng and 0000-0003-2330-953X |