Thermal-Electrochemical Modeling of a Proton Exchange Membrane Fuel Cell
Thermal-Electrochemical Modeling of a Proton Exchange Membrane Fuel Cell
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DOI：
10.1149/1.2137652
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发表时间：
2006-02
影响因子：
3.9
通讯作者：
Jenn-Jiang Hwang
中科院分区：
文献类型：
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作者：
Jenn-Jiang Hwang
提出了一种热 - 电化学耦合模型，用于预测质子交换膜（PEM）燃料电池中的电化学和传热行为。达西流的布林克曼扩展描述了多孔电极中的流体流动特性。斯蒂芬 - 麦克斯韦关联式以及布鲁格曼修正说明了多孔电极中的多物质扩散。采用双方程方法来解释气体扩散层中固体基质和流体之间的局部热非平衡。在催化剂层中，由不可逆过程产热导致的热耗散由宏观电化学模型确定。本模型能够同时预测燃料电池内部的固相温度和液相温度，这有助于全面理解热路径的相关机制。最重要的是，它成功地评估了PEM燃料电池内出现热点的可能性。将固相和液相之间的界面传热系数（$h_v$）从$1.0\times10^3$提高到$1.0\times10^6$ $W/m^3K$有利于缓解热点。在未来的工作中将纳入热对活性材料降解以及燃料电池循环寿命的影响。
A thermal-electrochemical coupled model is presented to predict electrochemical and heat transfer behaviors in a proton exchange membrane (PEM) fuel cell. The Brinkman extension to Darcy flow describes the fluid flow characteristics in the porous electrodes. The Stefan-Maxwell correlations together with the Bruggemann modification illustrate the multispecies diffusion in the porous electrode. A two-equation approach is used to account for the local thermal nonequilibrium between the solid matrices and the fluids in the gas diffusion layers. In the catalyst layers, the heat dissipation due to irreversible-process heating is determined from the macroscopic electrochemical model. The present model is capable of simultaneously predicting the solid phase temperature and the fluid phase temperature inside the fuel cell, which enables a comprehensive understanding of the mechanisms responsible for thermal pathways. Most importantly, it has successfully assessed the possibility of hot spots within a PEM fuel cell. Increasing the interfacial heat-transfer coefficient between the solid phase and the fluid phase (hv) from 1.0 X 10 3 to 1.0 X 10 6 W/m 3 K has an advantage of alleviating the hot spot. Thermal effects on the active material degradation and hence fuel cell cycle life will be incorporated in the future work.