Effect of clamping pressure on ohmic resistance and compression of gas diffusion layers for polymer electrolyte fuel cells
Effect of clamping pressure on ohmic resistance and compression of gas diffusion layers for polymer electrolyte fuel cells
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DOI：
10.1016/j.jpowsour.2012.07.021
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发表时间：
2012-12
影响因子：
9.2
通讯作者：
T. Mason;J. Millichamp;T. Neville;A. El-kharouf;B. Pollet;D. Brett
中科院分区：
文献类型：
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作者：
T. Mason;J. Millichamp;T. Neville;A. El-kharouf;B. Pollet;D. Brett
本文介绍了使用的原位分析技术的基础上同时位移和电阻测量的气体扩散层（GDLs）用于聚合物电解质燃料电池（PEFC），当暴露于不同的压实压力。就燃料电池内的损耗而言，欧姆损耗占很大一部分。在这种损失中，GDL和双极板（BPP）之间的接触电阻是重要的组成部分。通过分析GDL层在压缩过程中的厚度变化和欧姆电阻，得到了重要的力学和电学性能。导出的参数，如“位移因子”，用于模拟商业GDL的代表性范围。增加压实压力导致所有GDL的电阻非线性下降。对于东丽纸，压实变得更不可逆的压力，没有观察到弹性区域。不同的GDL具有不同的固有电阻;然而，同一类别的所有GDL共享共同的压实曲线（电阻随压力变化）。Toray GDL的循环压缩导致阻力逐步改善，厚度减少，在10次循环后稳定。
This paper describes the use of an in situ analytical technique based on simultaneous displacement and resistance measurement of gas diffusion layers (GDLs) used in polymer electrolyte fuel cells (PEFCs), when exposed to varying compaction pressure. In terms of the losses within fuel cells, the ohmic loss makes up a significant portion. Of this loss, the contact resistance between the GDL and the bipolar plate (BPP) is an important constituent. By analysing the change in thickness and ohmic resistance of GDLs under compression, important mechanical and electrical properties are obtained. Derived parameters such as the ‘displacement factor’ are used to characterise a representative range of commercial GDLs. Increasing compaction pressure leads to a non-linear decrease in resistance for all GDLs. For Toray paper, compaction becomes more irreversible with pressure with no elastic region observed. Different GDLs have different intrinsic resistance; however, all GDLs of the same class share a common compaction profile (change in resistance with pressure). Cyclic compression of Toray GDL leads to progressive improvement in resistance and reduction in thickness that stabilises after ∼10 cycles.