直流道PEMFC的综合三维数学模型及其性能模拟  

Comprehensive Three-Dimensional Model of PEMFC with Straight Flow Channels and Cell Performance Simulation

作　　者：刘训良[1] 温治[1] 陶文铨[2] 何雅玲[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]西安交通大学能源与动力学院,陕西西安710049

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第2期306-310,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金资助项目(50236010)

摘　　要：目的研究质子交换膜燃料电池中扩散层厚度、孔隙率和催化剂颗粒尺寸等参数对电池性能的影响.方法对直流道质子交换膜燃料电池建立综合的三维多组分数学模型,电化学反应速率采用团聚块模型修正,自主开发程序代码对电池的极化性能进行数值模拟,利用该模型研究了扩散层厚度、孔隙率和催化剂颗粒尺寸等参数对电池性能的影响.结果增大气体扩散层孔隙率有利于提高电池的极化性能,但是应考虑孔隙率增加引起的不利影响;存在最佳的扩散层厚度使电池的极化性能最优;减小催化剂颗粒的特征尺寸可以提高电池的极化性能.结论利用直流道质子交换膜燃料电池的综合三维数学模型,可以进行燃料电池极化性能的模拟,并能对电池的主要结构参数进行优化.The purpose of this paper is to investigate the effects on cell performance of gas-diffusion layer thickness, porosity, and the catalyst particle size. A comprehensive three-dimensional multicomponent transport model was developed for a typical unit of Proton Exchange Membrane fuel cell （PEMFC） with straight flow channels. The activation overpotential was obtained locally in the catalyst layer by solving electric potential equations separately for the membrane and solid phase, instead of assuming a constant through the catalyst layer. The electrochemical reaction rate in the catalyst layer was modified by the agglomerate model to account for the effect of diffusion resistance across the catalyst particles. The cell polarization curve is predicted by the model, and it agrees well with the experimental data published. The model is used to investigate the effects of gas-diffusion layer thickness, porosity, and the catalyst particle size. Conclusion are drawn as follow： the cell performance can be enhanced by increasing the porosity of gas-diffusion layer; and the thickness of the gas diffusion should be optimized to fulfill the requirements of the electro-chemical reaction rate and the fuel cell cost. Also the cell performance can be enhanced by educing the catalyst particlesize

关 键 词：质子交换膜燃料电池 三维数学模型 团聚块模型 性能模拟 

分 类 号：TM911.4[电气工程—电力电子与电力传动]