Micro-perforation of the diffusion media for polymer electrolyte membrane fuel cells using short and ultrashort laser pulses
Micro-perforation of the diffusion media for polymer electrolyte membrane fuel cells using short and ultrashort laser pulses
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使用短和超短激光脉冲对聚合物电解质膜燃料电池扩散介质进行微穿孔
DOI：
10.1016/j.procir.2022.08.131
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
M. Zaeh
中科院分区：
文献类型：
--
作者：
Christian Geiger;J. Kriegler;T. Weiss;A. Berger;M. Zaeh
聚合物电解质膜燃料电池内的水管理是限制其广泛商业应用的主要挑战之一。通过在碳基扩散介质中引入定向孔，可以改善水传输性能。因此，可以提高燃料电池在苛刻操作条件下的性能和寿命。在这项工作中，利用红外波长的短脉冲和超短脉冲激光辐射，通过局部烧蚀材料对扩散介质的微孔层进行穿孔。评估了脉冲持续时间以及峰值脉冲注量和脉冲数量对烧蚀速率和表面质量的影响。应用激光扫描显微镜来评估微钻孔的形貌。通过扫描电子显微镜和能量色散 X 射线光谱研究了微钻孔周围的热影响区。研究了短脉冲和超短脉冲激光辐射对微孔层内疏水性粘合剂的影响。结果表明，通过将脉冲长度从纳秒范围减小到皮秒范围，微钻孔附近的粘合剂蒸发减少。
The water management within polymer electrolyte membrane fuel cells is one of the main challenges limiting their extensive commercial application. By introducing directed pores in the carbon-based diffusion media, the water transport properties can be improved. Thus, the performance at demanding operating conditions and the lifetime of the fuel cell can be enhanced. In this work, the microporous layer of a diffusion media was perforated by locally ablating material using short and ultrashort-pulsed laser radiation with infrared wavelength. The influence of the pulse duration as well as the peak pulse fluence and the number of pulses on the ablation rate and the surface quality was evaluated. Laser scanning microscopy was applied to assess the topography of the micro-drillings. The heat-affected zone around the micro-drillings was investigated by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The impact of short and ultrashort pulse laser radiation on the hydrophobic binder within the microporous layer was studied. Results showed a decreased binder evaporation in the vicinity of the micro-drillings by a reduction of the pulse length from the nanosecond to the picosecond range.