Visualization of the Membrane Temperature Field of a Polymer Electrolyte Fuel Cell
Visualization of the Membrane Temperature Field of a Polymer Electrolyte Fuel Cell
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DOI：
10.1115/1.1811119
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发表时间：
2004-12
影响因子：
3
通讯作者：
Ryoichi Shimoi;Masao Masuda;K. Fushinobu;Y. Kozawa;K. Okazaki
中科院分区：
文献类型：
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作者：
Ryoichi Shimoi;Masao Masuda;K. Fushinobu;Y. Kozawa;K. Okazaki
对聚合物电解质燃料电池（PEFC）的膜温度场进行了实验可视化。pefc在市场上的部署需要进一步突破。其中一个主要问题是聚合物膜和整个电池的温度管理，它通过电化学反应、离子传输、水管理和气体供应强烈地控制着系统的性能。然而，由于细胞结构的原因，膜的温度场没有被可视化。在我们的实验中，热成像技术应用于可视化操作的测试细胞。尽管具有独特的配置，但测量的i-V特性保证了电池的性能。可视化结果揭示了几个重要的特征，帮助我们理解物理和建议设计知识。一个主要的结果是所谓的热点的存在。膜确实有温度分布，局部最高温度可能超过膜的设计限制。当然，这种趋势对于设计目的是不利的。此外，主要操作参数的影响，如电流密度加湿，和气体流动配置，已被清楚地展示。用我们先前开发的数值代码的结果对实验结果进行了检验。该代码包括电化学反应的共轭性质以及热和质量传递过程。通过实验与计算的比较，解释了热点产生的机理和参数依赖关系。结果揭示了物理原理，并提出了基本的设计标准。
Membrane temperature field of a polymer electrolyte fuel cell (PEFC) has been visualized experimentally. PEFCs need further breakthrough for deployment in the market. One of the major issues is the temperature management of the polymer membrane and the whole cell that strongly govern system performance through electrochemical reactions, ion transport, water management, and gas supply. The temperature field of the membrane, however had not been visualized due to the cell configuration. In our experiment, the thermography technique is applied to visualize an operating test cell. Despite the unique configuration, measured i-V characteristics guarantee the cell performance. The visualization results revealed several important characteristics that help us understanding the physics and suggest design knowledge. One major result is the existence of so called a hot spot. The membrane does have a temperature distribution, and a local temperature maximum may exceed the membrane design limitation. This trend, of course, is not favorable for design purposes. Also, the impact of the major operation parameters, such as current density humidification, and gas flow configuration, have been clearly exhibited. The experimental results are examined by using the results of our previously developed numerical code. The code includes the conjugate nature of the electrochemical reaction and the heat and mass transport processes. By comparing the experiment and the calculation, the mechanisms of the hot-spot generation and the parameter dependence have been explained. The results revealed the physics and suggested essential design criteria.