权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on the transfer phenomena of gas, liquid, heat, and electron in a cell for the development of high performance PEM fuel cell available in low temperature conditions

研究电池中气体、液体、热和电子的传递现象，用于开发低温条件下的高性能质子交换膜燃料电池

基本信息

批准号：
17360089
负责人：
CHIKAHISA Takemi
金额：
$ 9.59万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360089/
关键词：
Fuel Cell PEFC Polymer Electric Membrane Water Freezing Two Phase Flow Observation Gas Diffusion Layer

项目摘要

This study has been conducted to clarify the mass, heat, electron transport phenomena in gas diffusion layers (GDLs) in fuel cell. Using an optical fuel cell, temperature distribution in cathode channel and current density distribution in anode channel was investigated. The experimental results showed that there is good correlation between the temperature distribution and the current density distribution, and uniformity of the contact pressure strongly influences the temperature and current density distributions. The observation result indicated that there is a condition when gas paths are established deep in the gas diffusion layer in flooded condition, suggesting a possibility to legalize good performance with utilizing this phenomenon.In PEFC at low temperature, the freezing of produced water induces the extreme deterioration of cell performance. To clarify the freezing phenomenon and influencing factors of freezing in PEFC, experimental attempts were conducted. The results showed t … More hat the water initially diffuses back into the membrane, followed by water production in the surface of the cathode. The initial step is dependent on the water content in the membrane, and it must be controlled to an optimal value before lowering the temperature. It was also shown that the freezing characteristics are different for GDL characteristics. When temperature is lower than -20 deg. C, the frozen layer appears to be formed in catalysis layer.The lattice Boltzmann method was applied and the two-phase flow in the separator-channels was simulated to understand the behavior of condensed water in PEMFC. The projection method was used for the large density difference between liquid and gas. Further, the wetting potential was introduced into the boundary conditions to consider the effect of wettability on the water behavior. It demonstrated the difference in the water removal motion for the different configurations and wettabilities of channels. The method can be a powerful tool for the simulation of two-phase flow in fuel cells. Less

本研究旨在探讨燃料电池气体扩散层中的质、热、电子传递现象。利用光学燃料电池，研究了阴极通道内的温度分布和阳极通道内的电流密度分布。实验结果表明，温度分布与电流密度分布之间存在很好的相关性，接触压力的均匀性对温度和电流密度分布有很大的影响。观察结果表明，在溢流条件下，气体扩散层的深处存在气体通道，这表明利用这种现象可以使良好的性能合法化。在低温PEFC中，采出水的冻结导致电池性能的极度恶化。为了弄清PEFC中的冻结现象及其影响因素，进行了实验尝试。结果表明， ...更多信息水最初扩散回到膜中，随后在阴极表面产生水。初始步骤取决于膜中的水含量，并且在降低温度之前必须将其控制在最佳值。研究还表明，GDL特性的冻结特性是不同的。当温度低于-20 ℃时，采用格子Boltzmann方法对PEMFC中分离器通道内的两相流进行了数值模拟，研究了冷凝水在分离器通道内的流动行为。由于液相和气相的密度相差较大，采用投影法进行计算。在边界条件中引入润湿势，考虑了润湿性对水行为的影响。结果表明，不同结构和润湿性的流道在水的去除运动中存在差异。该方法可以作为燃料电池两相流模拟的有力工具。少