Gel electrolytes of covalent network polybenzimidazole and phosphoric acid by direct casting

Title
Gel electrolytes of covalent network polybenzimidazole and phosphoric acid by direct casting
Authors
헨켄스마이어디억Andreas KirkebækDavid AiliJens Oluf JensenQingfeng Li
Keywords
direct casting; fuel cell; HT-PEMFC; polybenzimidazole; polymer electrolyte
Issue Date
2017-12
Publisher
Macromolecular materials and engineering
Citation
VOL 302, NO 12-7
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/67126
ISSN
1438-7492
Appears in Collections:
KIST Publication > Article
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