Polybenzimidazolium-Based Solid Electrolytes

Title
Polybenzimidazolium-Based Solid Electrolytes
Authors
헨켄스마이어디억김형준이혜진이동훈오인환홍성안남석우임태훈
Keywords
anionic exchange membranes; degradation; membranes; polybenzimidazole; polymer electrolyte fuel cells (PEFC)
Issue Date
2011-10
Publisher
Macromolecular materials and engineering
Citation
VOL 296, NO 10, 899-908
Abstract
A series of methyl, benzyl, and mixed polybenzimidazolium halides was synthesised and characterised by NMR spectroscopy. Membranes were formed and ion exchanged with hydroxides. These membranes are of interest for use in potentially platinum-free anionic exchange membrane fuel cells. Crosslinked membranes were obtained by the addition of α,α'-dibromo-p-xylene to the casting solution. The ion conductivity of membranes was determined by impedance spectroscopy. A hydroxide conductivity of 29 mSㆍcm-1 at 26 ℃ and 58 mSㆍcm-1 at 60 ℃ was obtained. The thermal and hydrolytic stability was investigated and a pathway for hydrolytic degradation proposed. Hydroxide ions react at the 2 position, the intermediate carbinol opens to the amine–amide, and further degrades under chain scission to diamine and carboxylic acid.
URI
http://pubs.kist.re.kr/handle/201004/40428
ISSN
1438-7492
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KIST Publication > Article
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