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揭示反应剂在气体扩散层中的不均质性以及由组装压力诱导的PEMFC的性能

Liu Yang^1,2, Z Y Sun¹, Guang-Meng Zhang^2,3

¹Hydrogen Energy and Space Propulsion Laboratory (HESPL), School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China.

|August 26, 2024

概括

组装压力通过改变气体扩散层 (GDL) 特性和反应剂分布,显著影响质子交换膜燃料电池 (PEMFC) 的性能. 优化这种压力是提高PEMFC功率密度和防止热损伤的关键.

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
机械工程机械工程

背景情况:

质子交换膜燃料电池 (PEMFC) 依靠气体扩散层 (GDL) 来进行反应物和电子运输.
燃料电池是多孔的碳元件,在压缩下容易变形,影响燃料电池的性能.
了解组装压力对GDL的影响对于提高PEMFC效率和耐用性至关重要.

研究的目的:

调查GDL对不同组装压力的结构反应.
分析组装压力如何影响GDL运输特性和反应剂分布.
为了确定组装压力对PEMFCs动态性能的影响.

主要方法:

在压缩下研究了GDLs的结构变形.
分析了GDL多孔性和透性的变化,特别是在肋骨/通道接口附近.
评估了由此产生的反应剂分布和电流密度的不均性.
评估了对PEMFC功率密度和热风险的影响.

主要成果:

组装压力会对肋骨和通道下的GDL区域产生差异性影响.
在肋骨/通道过渡区发生显著的多孔性和透性变化,导致反应物分布不均.
电流密度分布变得不均,边界附近的密度增加,增加热损伤风险.
特定的组装压力可以在某些效率下提高功率密度.

结论:

组装压力严重改变了GDL的结构和功能,影响了PEMFC的性能.
反应物的不均分布和局部高电流密度对MEA构成风险.
确定最佳组装压力对于最大限度地提高PEMFC输出和操作安全至关重要.

关键词:

组装压力影响组装压力影响.动态性能表现动态性能表现气体扩散层是一种气体扩散层.在PEMFC中,PEMFC是最重要的.运输属性运输属性

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