设计一个迷宫结构的气体扩散层,以延长水运输路径,以提高空冷燃料电池的性能和稳定性
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Published on: September 20, 2012
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Xingyu Zhu1,2, Fandi Ning1,2, Xueyan Chu1
1Division of Advanced Nanomaterials, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences (CAS), Suzhou 215123, China.
ACS applied materials & interfaces
|May 22, 2025
概括
一种新的迷宫式气体扩散层 (GDL) 通过提高内部湿度,显著提高了空气冷却燃料电池性能. 这种迷宫GDL减少了水损失,提高了功率密度和耐用性.
科学领域:
- 能源转化和储存 能源转化和储存
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 空气冷却燃料电池由于内部湿度低而面临性能下降.
- 在空冷燃料电池中,从气体扩散层 (GDL) 快速排出的水减少了膜电极组件 (MEA) 的水分.
- 低湿度会损害质子交换膜 (PEM) 导电性,影响燃料电池的性能和耐用性.
研究的目的:
- 为空气冷却燃料电池设计和评估一种新的迷宫状气体扩散层 (M-GDL).
- 为了提高内部湿度和减轻水排放造成的性能损失.
- 提高空冷燃料电池系统的整体效率和寿命.
主要方法:
- 一个迷宫式结构的GDL的设计,灵感来自于曲的运输路径.
- 实施水蒸发试验以量化水损失阻力.
- 使用M-GDL的燃料电池的性能测试与商业GDL相比.
主要成果:
- 与商业GDL (0.79 mg min-1 cm-2) 相比,M-GDL显示的水损失率显著较低 (0.35 mg min-1 cm-2).
- 配备M-GDL的燃料电池达到0.77W cm-2的峰值功率密度,是商业GDL (0.4W cm-2) 的两倍多.
- 迷宫结构有效地扩展了水运输通道,增加了内部湿度.
结论:
- 开发的M-GDL是一种有效的策略,可以改善空气冷却燃料电池的水保持率.
- 提高内部湿度直接转化为提高燃料电池性能和功率密度.
- 这项研究为推进空冷燃料电池技术提供了一个有前途的方法.
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