The effects of water and microstructure on the performance of polymer electrolyte fuel cells
The effects of water and microstructure on the performance of polymer electrolyte fuel cells
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DOI：
10.1016/j.jpowsour.2006.02.085
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发表时间：
2006-10
影响因子：
9.2
通讯作者：
A. Shah;G. Kim;Wesley Gervais;A. Young;K. Promislow;Jing Li;Siyu Ye
中科院分区：
文献类型：
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作者：
A. Shah;G. Kim;Wesley Gervais;A. Young;K. Promislow;Jing Li;Siyu Ye
在本文中，我们提出了一个全面的非等温，一维模型的阴极侧的聚合物电解质燃料电池。我们明确地包括催化剂层、气体扩散层和膜。催化剂层和气体扩散层的特征在于几个可测量的微观结构参数。我们对水的所有三个相进行建模，以捕捉每个相对电池性能的影响。与实验的比较，表现出很好的协议，特别是在渠道中的水活性的影响，以及它如何影响洪水和膜水合作用。我们提出了几个结果有关的电流密度（或电池电压）的水的影响，展示了微观结构的作用，液态水从通道中去除，水的活性，膜和气体扩散层的厚度和通道温度。这些结果提供了一个指示，需要通过改进水管理和多边环境协定组件的设计，以实现最佳性能的变化。此外，由于其详细程度，我们开发的模型为整个膜电极组件的多维模型奠定了良好的基础。
In this paper, we present a comprehensive non-isothermal, one-dimensional model of the cathode side of a Polymer Electrolyte Fuel Cell. We explicitly include the catalyst layer, gas diffusion layer and the membrane. The catalyst layer and gas diffusion layer are characterized by several measurable microstructural parameters. We model all three phases of water, with a view to capturing the effect that each has on the performance of the cell. A comparison with experiment is presented, demonstrating excellent agreement, particularly with regard to the effects of water activity in the channels and how it impacts flooding and membrane hydration. We present several results pertaining to the effects of water on the current density (or cell voltage), demonstrating the role of micro-structure, liquid water removal from the channel, water activity, membrane and gas diffusion layer thickness and channel temperature. These results provide an indication of the changes that are required to achieve optimal performance through improved water management and MEA-component design. Moreover, with its level of detail, the model we develop forms an excellent basis for a multi-dimensional model of the entire membrane electrode assembly.