薄酸聚合物具有内在的微孔性,具有高的氧气透性,作为PEMFC催化剂层离子体
Theresa Stigler1,2, Tamas Nemeth3, Patrick Fortin3
1Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IET-2), Cauerstr. 1, Erlangen 91058, Germany.
ACS applied energy materials
|April 18, 2025
概括
一种具有内在微孔性的新型薄聚合物 (pPIM) 通过改善催化剂层中的气体扩散来提高质子交换膜燃料电池 (PEMFC) 的性能. 这种材料比传统的离子体提供了更好的氧气传输.
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:
- 质子交换膜燃料电池 (PEMFCs) 对清洁能源至关重要.
- 催化剂层的离子体对于质子/反应物运输和电极结构至关重要.
- 在离子体中改善质量传输可以减轻高电流密度的性能损失.
研究的目的:
- 开发一种新型的离子体,一种具有内在微孔性的薄化聚合物 (pPIM),以增强PEMFC催化剂层的质量传输.
- 研究PPIM独特结构对气体扩散和质子导电的影响.
- 为了评估pPIM在*in situ* PEMFC测试中的性能,与传统的离子计相比.
主要方法:
- 一种具有内在微性的稀化聚合物 (pPIM) 的合成.
- 描述PPIM的离子网络结构和多孔性.
- 使用pPIM作为ionomer进行*in situ*PEMFC测试的催化剂层的制造.
- 改变离子体与碳 (I/C) 的比率以优化性能.
- 测量氧气扩散系数和燃料电池的整体性能.
主要成果:
- pPIM具有高度扭曲的结构,导致孔隙性增加和气体扩散增强.
- 在PPIM中的酸组确保了高效的质子导电.
- 与Nafion相比,PEMFC测试显示,pPIM的I/C比率为0.2,与Nafion相比,pPIM的氧气扩散系数更高.
- 在高电流密度下,pPIM有效地减轻了运输损失.
结论:
- 开发的ppim为PEMFC催化剂层提供了卓越的质量传输特性.
- 这种新型的离子体证明了提高燃料电池效率和耐用性的潜力.
- 对于先进的PEMFC应用,pPIM代表了传统离子体的有希望的替代品.
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