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Preparation of Polybenzimidazole/Lithium Hydrazinium Sulfate Composite Membranes for High-Temperature Fuel Cell Applications

✍ Scribed by Jung-Woo Jung; Sung-Kon Kim; Jong-Chan Lee

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
440 KB
Volume
211
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

PBI‐LiHzS composite membranes were prepared by casting N,N'‐DMAc solutions containing PBI and LiHzS, where the LiHzS contents in the membranes were between 2.5 and 10 wt.‐%. LiHzS was obtained by reacting hydrazine sulfate and lithium carbonate in water. PBI‐LiHzS composite membranes were thermally stable up to approximately 300 °C and their acid‐absorbing capabilities were comparable to those of the pure PBI membranes. The proton conductivity of PBI‐LiHzS composite membranes (2.12 × 10^−2^ S · cm^−1^ at 180 °C and 0% RH) was higher than that of pure PBI membranes when used at the same acid doping levels. The mechanical stability of the composite membranes having less than 5 wt.‐% of LiHzS was found to be close to that of pure PBI membranes.

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