Quantitative estimation of water vapor distribution in low-humidity proton exchange membrane fuel cell using humidity test paper
Quantitative estimation of water vapor distribution in low-humidity proton exchange membrane fuel cell using humidity test paper
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DOI：
10.1016/j.jpowsour.2013.01.160
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发表时间：
2013-07
影响因子：
9.2
通讯作者：
Kosuke Nishida;Y. Yokoi;M. Asa;S. Tsushima;S. Hirai
中科院分区：
文献类型：
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作者：
Kosuke Nishida;Y. Yokoi;M. Asa;S. Tsushima;S. Hirai
为了防止质子交换膜燃料电池（PEMFC）在低湿度条件下因膜干燥而导致的性能下降，需要对燃料电池运行过程中阳极侧水的传输和反应机理有基本的了解。采用湿度测试纸（HTP）对低湿度质子交换膜燃料电池阳极流道内水蒸气分布进行了沿着定量评价，研究了进气增湿和流道结构对阳极内水分布的影响。HTP是用于检测20- 90%RH范围内的水蒸气的试纸，并且使得可以直接可视化透明PEMFC在运行期间的气体流路中的水分布。此外，还使用分段电池结构概念测量了局部分辨电流密度。结果发现，阳极入口气体的高湿度增加了阳极通道中的水蒸气浓度，并防止膜脱水。此外，逆流配置有效地改善了低湿PEMFC阳极入口区域附近的水管理，并增强了电解质膜中的质子传导率。
To prevent performance degradation due to membrane dryout in proton exchange membrane fuel cells (PEMFCs) under low-humidity conditions, fundamental understanding of water transport and reaction mechanism on anode side in operating fuel cell is required. In this study, the water vapor distribution along the anode flow channel of a low-humidity PEMFC was quantitatively evaluated by using humidity test paper (HTP), and the effects of inlet gas humidification and flow configuration on the water distribution in the anode were investigated. HTP is a test paper for detecting water vapor in the range of 20–90% RH, and makes it possible to directly visualize the water distribution in the gas flow channel of the transparent PEMFC during operation. Furthermore, the locally resolved current density was also measured using segmented cell structure concept. It was found that the high humidification of the anode inlet gas increases the water vapor concentration in the anode channel and prevents the membrane dehydration. In addition, the counter-flow configuration effectively improves the water management near the anode inlet region of the low-humidity PEMFC and enhances the proton conductivity in the electrolyte membrane.