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四元化PAF架构介导质子通道,以增强200°C质子交换膜燃料电池的超强型运行
Xinyi Zong1, Haina Mi2, Fei Chen2
1School of Chemistry and Life Science, Changchun University of Technology, 2055 Yanan Street, Changchun, 130012, P.R. China.
Angewandte Chemie (International ed. in English)
|June 4, 2025
概括
一种使用四级功能化的多孔芳香框架 (QPAF-225) 的新型复合膜增强了高温质子交换膜燃料电池 (HT-PEMFCs). 这种材料通过提高质子导电性和酸保留来实现高功率密度和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 高温质子交换膜燃料电池 (HT-PEMFCs) 需要平衡功率密度和酸 (PA) 保留的膜.
- 由于PA泄漏和有限的界面相互作用,现有的PA-doped polybenzimidazole (PA-PBI) 膜在维持性能方面面临着挑战.
- 在HT-PEM中研究自强化网络对于优化燃料电池性能和耐用性至关重要.
研究的目的:
- 通过将四级 (QA) 功能化的多孔芳香框架 (QPAF-225) 与硫化聚[2,2'-(p-oxydiphenylene) -5,5'-bibenzimidazole] (SOPBI) 集成,开发出一个强大的HT-PEM.
- 建立一个协同的自我强化的质子导电网络,并增强PA保留.
- 为了提高HT-PEMFC的功率密度和长期稳定性.
主要方法:
- 使用QPAF-225和SOPBI制造复合HT-PEM,利用QA部分和硫酸组之间的离子相互作用.
- 利用QPAF-225中的高密度基站作为PA储来缓解泄漏.
- 在HT-PEMFC中对QPAF-225-10复合膜与QA缺陷和原始膜进行基准测试.
主要成果:
- 在200°C时,QPAF-225-10复合膜实现了174mS cm-1的高质子导电性.
- 在200°C时,HT-PEMFC在超低Pt/C负荷 (0.3 mg cm−2) 的情况下记录了847mW cm−2的异常高峰功率密度.
- 膜表现出超低电压衰变 (在200°C时904小时内0.04mVh-1),以及优越的PA保留和机械强度.
结论:
- 开发的QPAF-225-SOPBI复合膜为HT-PEMFCs提供了突破性进展,将高功率运行与长期稳定性相协调.
- 这种材料范式利用多孔芳香框架介导的质子通道和PA-philic动机,在恶劣的电化学环境中提高性能.
- 该战略超越了传统的添加剂,为下一代HT-PEM铺平了道路.
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