中温燃料电池的氧气和质子运输开放框架离子体
Jianwei Yang1, Hengyu Xu2, Jie Li1
1Key Laboratory of Cluster Science, Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Frontiers Science Center for High Energy Material, Advanced Technology Research Institute (Jinan), School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.
Science (New York, N.Y.)
|September 5, 2024
概括
新的共价有机框架 (COF) 离子体通过改善水和质子导电性来增强中温质子交换膜燃料电池 (MT PEMFC). 这提高了功率密度和在高工作温度下的性能.
科学领域:
- 电化学
- 材料科学
- 化学工程
背景情况:
- 中温质子交换膜燃料电池 (MT PEMFC) 与低温对应物相比具有优势,但在100°C~120°C时会出现离子体脱水和气体输送问题.
- 对于质子导电至关重要的纳离子可以在较高的温度下脱水,从而限制燃料电池的效率.
研究的目的:
- 开发新型离子体,以改善MT PEMFC中的水和质子导电性.
- 为了克服在高温下运行的MT PEMFC中的气体运输限制.
- 通过生物启发的方法提高MT PEMFC的性能.
主要方法:
- 合成的α-氨基联共价有机框架 (COF) 离子体.
- 将COF离子体与Nafion交织在一起,形成复合膜.
- 在105°C使用H2和空气燃料测试了MT PEMFCs的性能.
- 评估了质子和氧气运输特性.
主要成果:
- 通过利用协同的键来保持水分,COF离子体以奥斯莫利特为灵感,充当"可呼吸"的质子导体.
- 观察到增强的水分和质子运输,以及减少的氧气运输阻力.
- 与对照细胞相比,使用COF- Nafion的MT PEMFC实现了18. 1W/ mgPt的峰值功率密度和9. 5W/ mgPt的额定功率密度,相当于显著增加 (101%和187%).
结论:
- 开发的COF离子体有效地解决了MT PEMFC的水资源管理和气体运输挑战.
- 这种新材料显著提高了燃料电池的性能,为推进高温燃料电池技术展示了一个有前途的战略.
- 生物启发的设计为更耐用和高效的质子交换膜燃料电池提供了途径.
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