作为燃料电池应用中的质子导电膜的阿利法/芳香聚胺离子体
Naoki Asano1, Makoto Aoki, Shinsuke Suzuki
1Clean Energy Research Center, and Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan.
Journal of the American Chemical Society
|February 2, 2006
概括
新的硫化聚胺离子体为燃料电池提供持久的质子导电性. 这些膜的性能与Nafion相美,即使在高温和湿度下也是如此.
科学领域:
- 聚合物科学 聚合物科学
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 开发持久且导质子的聚合物电解质膜对于推进燃料电池技术至关重要.
- 像Nafion这样的 perfluorinated ionomers被广泛使用,但在成本和高温性能方面存在局限性.
- 需要替代材料,提供可比或优越的性能,增强耐用性.
研究的目的:
- 为了合成和描述用于燃料电池应用的新型硫化聚胺离子体.
- 评估合成膜的质子导电性,机械性质和气体透性.
- 评估这些离子体在燃料电池环境中的长期耐用性和性能.
主要方法:
- 通过多重凝聚反应合成硫化聚胺离子体.
- 离子交换能力 (IEC),质子导电性和机械性质的表征.
- 微观分析以调查水友性域结构.
- 气体透度测量 (H2和O2) 和燃料电池测试.
主要成果:
- 合成的硫化聚胺离子体 (1),IEC值为1.78-2.33mequiv/g,作为透明的软膜.
- 质子导电性与Nafion在更高温度 (140°C) 和100%的RH下相当,达到0.18 S cm(-1).
- 与Nafion相比,和氧的透性显著降低 (1-2 个数量级).
- 证明了与Nafion可比的燃料电池性能和5000小时以上的优异耐用性.
结论:
- 化聚胺离子体与亚利法基具有可靠的质子导电性和燃料电池稳定性.
- 高IEC和分支结构有助于通过分散的水友性领域改善质子传输.
- 这些新型膜为Nafion提供了可行的替代品,具有增强的气体屏障性能和长期耐用性.
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