一种考虑催化层结构参数的PEMFC气相模型

质子交换膜燃料电池的结构设计对燃料电池车的开发具有重要意义。目前的电池模型通常把催化层简化成一层薄膜,作为边界条件使用,无法分析催化层结构对电池性能的影响。建立了考虑催化层结构参数的一维气相模型,通过有限元法研究电池内部的流场和电场分布。仿真结果和实验符合良好。分析指出扩散层的孔隙率对电池性能影响较大,应高于0.3,催化层的孔隙率对电池性能影响较小。在催化剂载量不变的情况下,催化层厚度应为10~20 mm。

Model of proton exchange membrane fuel cell with parameters of catalyst layer

Proton exchange membrane fuel cell (PEMFC) is the key to the designs of fuel cell vehicles.The catalyst layer is usually considered as a thin film and used as boundary conditions of control equations in most of PEMFC models.A one-dimension gas model of PEMFC with the structure parameters of the catalyst layer was provided.The simulate results fit well with experimental data.The analysis results show that the porosity of gas diffusion layer should be large than 0.3,the porosity of catalyst layer has minor effect on the performance of fuel cell,and the thickness of catalytic layer should be 10-20 μm.