用于改进的电化学设备的高透硫酸离子体:结构与性能关系的洞察
Adlai Katzenberg1,2, Anamika Chowdhury3,2, Minfeng Fang1
1Tandon School of Engineering , New York University , Brooklyn , NY 11201 , United States.
Journal of the American Chemical Society
|January 21, 2020
概括
研究人员开发了一种用于聚合物电解质燃料电池 (PEFC) 的新离子体. 这种新材料提高了气体透性,有可能提高燃料电池的性能,特别是在低负载时.
科学领域:
- 材料科学
- 电化学
- 化学工程
背景情况:
- 商用离子体对于聚合物电解质燃料电池 (PEFC) 至关重要,其基础是化化学 (例如,聚四乙烯 - PTFE).
- 虽然PTFE具有机械强度和低气体透性,但它会导致电极的大量输送损失,限制PEFC的性能,特别是在低负载的情况下.
研究的目的:
- 引入一种具有 perfluoro ((2-methylene-4-methyl-1,3-dioxolane) (PFMMD) 骨干的新型离子体.
- 研究这种新的骨干化学如何影响离子体结构,水化,质子导电性和气体透性.
- 评估使用这种新型离子体作为PEFC中的催化剂的性能影响.
主要方法:
- 一种具有PFMMD骨干的新型离子体的合成.
- 离子体的结构变化的特征,包括在水合下域胀和结晶性破坏.
- 测量新型离子体的质子导电性和气体透性.
- 使用新型离子体作为催化剂结合剂评估PEFC性能.
主要成果:
- 新型PFMMD骨干破坏了基质结晶性,并限制了水合过程中的离子体域胀.
- 这些结构变化导致质子导电率略有下降,但气体透率显著增加.
- 将高透性离子体作为催化剂结合剂显示出可以大幅提高PEFC性能.
结论:
- 为优化PEFC性能,将离子体化学定制为特定设备的要求至关重要.
- 新型离子体设计提供了一个有前途的策略,以减轻PEFC电极的质量输送损失.
- 离子化学的合理设计可以提高燃料电池的效率,特别是在低负载的应用中.
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