基于芳香聚乙烯的调聚合物电解质膜用于燃料电池应用
Kenji Miyatake1, Yohei Chikashige, Eiji Higuchi
1Clean Energy Research Center, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan. m-watanabe@yamanashi.ac.jp
Journal of the American Chemical Society
|March 14, 2007
概括
新的聚乙烯硫离子体为聚合物电解质膜燃料电池 (PEMFC) 提供高质子导电性和稳定性. 这些膜表现出卓越的性能,即使在具有挑战性的低湿度条件下.
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:
- 基于聚乙烯硫的离子体对于聚合物电解质膜燃料电池 (PEMFC) 至关重要.
- 优化分子结构是实现高质子导电性和材料稳定性的关键.
研究的目的:
- 合成和优化用于PEMFC应用的新型离子体.
- 评估质子导电性,化学,机械和维度稳定性.
- 将性能与已建立的化膜 (如Nafion) 进行比较.
主要方法:
- 以硫烯基组为基的聚乙烯硫基离子体的合成.
- 对离子体结构的修改,包括甲基和异烯基四甲基双烯基组.
- 离子交换能力 (IEC),质子导电性和材料性能的表征.
- 长期稳定性测试 (1万小时) 和燃料电池性能评估.
主要成果:
- 开发出灵活,透明的膜,IEC从1.32到3.26 meq/g.
- 异烯四甲基双烯部分增强了稳定性和IEC.
- 甲基替代膜显示出更好的维度稳定性.
- 在各种条件下 (80-120°C,20-93%RH) 实现了与Nafion 112相当的质子导电性.
- 在80°C和93%的RH时,最高导电率为0.3S/cm.
- 膜在1万小时后仍保留了其特性,显示了连接良好的离子集群.
- 由于更好地保留水分,在90°C和20%的RH下比Nafion证明了燃料电池的优越性能.
结论:
- 优化的聚乙烯硫离子体为PEMFCs提供了对化膜的有希望的替代品.
- 新的膜表现出极好的稳定性和导电性,特别是在苛刻的操作条件下.
- 在高温和低湿度下优异的性能凸显了它们在先进燃料电池应用中的潜力.
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