Investigation of Hydrogen Cross-leak Behaviors in a Polymer Electrolyte Membrane by Direct Gas Mass Spectroscopy and Magnetic Resonance Imaging
Investigation of Hydrogen Cross-leak Behaviors in a Polymer Electrolyte Membrane by Direct Gas Mass Spectroscopy and Magnetic Resonance Imaging
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通过直接气体质谱和磁共振成像研究聚合物电解质膜中的氢交叉泄漏行为
DOI：
10.1149/1.2780957
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Hirai
中科院分区：
文献类型：
--
作者：
S. Tsushima;Takanori Nanjo;S. Hirai
在聚合物电解质膜燃料电池(PEMFC)中，氢的交叉泄漏对膜和/或催化剂层的降解起主要作用，因此聚合物电解质膜的氢渗透性具有重要意义。本研究采用直接气体质谱仪(DGMS)监测阴极排气中的氢气，用磁共振成像(MRI)技术监测膜水含量，研究了氢气交叉泄漏的机理。差示扫描量热仪(DGMS)测试表明，氢气渗透率随湿度、温度和阳极氢气分压的升高而增大。磁共振成像证实膜水合作用对氢气的通透性有很大影响。在较宽的相对湿度范围内，氢分压的影响是影响渗透速率的关键因素。在燃料电池运行条件下观察到氢渗透率降低，这可能是由于阳极中的氢消耗。这些观察结果表明，氢在膜中的溶解和扩散在质子交换膜燃料电池中氢的交叉泄漏中起着重要的作用。
Hydrogen permeability of polymer electrolyte membranes is of great importance since hydrogen cross-leak plays a major role in degradation of the membrane and/or catalyst layers in polymer electrolyte membrane fuel cells (PEMFCs). In this study, the hydrogen cross-leak mechanism was investigated using direct gas mass spectroscopy (DGMS) to monitor hydrogen in the cathode exhaust and magnetic resonance imaging (MRI) technique to monitor membrane water content. The DGMS measurement revealed that hydrogen permeability increased with humidity, temperature and hydrogen partial pressure in the anode. MRI visualization verified that hydrogen permeability was strongly affected by membrane hydration. Influence of hydrogen partial pressure was a key factor influencing permeation rates over a wide range of relative humidity. Reduced hydrogen permeation was observed under fuel cell operating conditions presumably due to hydrogen consumption in the anode. These observations suggest that dissolution and diffusion of hydrogen in the membrane play an important roll in hydrogen cross-leak in the PEMFC.