气体流量对PEM燃料电池电流密度分布的影响  

The Effects of Reactant Gas Flow Rate on Current Density Distribution of PEM Fuel Cells

作　　者：孙红[1] 吴玉厚[1] 张珂[1] 高晓佳[1] 

机构地区：[1]沈阳建筑大学交通与机械工程学院,沈阳110168

出　　处：《武汉理工大学学报》2006年第E02期479-483,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金（50576060）;辽宁省教育厅基金（05L349）和沈阳建筑大学省级重点实验室开放基金（JX-200603,JX-200602,JX-200605）.

摘　　要：气体流量对质子交换膜（PEM）燃料电池的性能和运行成本具有重要的影响。利用燃料电池电流密度分布测量垫片对PEM燃料电池的电流密度分布进行了测量，分析了氢气流量和空气流量对其性能的影响。实验显示：空气流量不足时，PEM燃料电池中所有局部电流密度都较低；增大空气流量，所有局部区域的电流密度都均匀增大；氢气流量不足时，入口附近局部电流密度较大，而出口附近局部电流密度几乎为零，电流密度分布曲线中出现局部电流密度快速降低区；增大氢气流量，入口附近局部电流密度增大，局部电流密度快速降低区域向气体出口处移动；当氢气流量大于120sccm后，局部电流密度几乎不变；实验结果对PFM燃料电池操作参数和性能的优化具有重要的参考作用。Reactant gas flow rates needed by proton exchange membrane （PEM） fuel cell have important influence on its performance and cost. In this paper, the current density distribution in PEM fuel cell is measured using the fuel cell current density measurement gasket, and the effects of the air and hydrogen flow rate on PEM fuel cell performance are analyzed. Experimental results show that all local current densities in PEM fuel cell are low for inadequate air flow rate, then increase equably with the increase of the air flow rate; for inadequate hydrogen flow rate, the current densities around the inlet are biggish, and those around the exit are almost zero; current density sharply decrease at some area of the density distribution for tow hydrogen flow rate; the current densities around the inlet increase with the increase of hydrogen flow rate, and the location for the area of current density sharp decrease moves to the exit; when the hydrogen flow rate is more than 120 seem, all local current densities are constant. The experimental results are very helpful to optimize operating parameters and performance of PEM fuel cells.

关 键 词：质子交换膜(PEM) 燃料电池 电流密度 反应气体 

分 类 号：TM911.4[电气工程—电力电子与电力传动]