中文摘要：

采用直接涂膜技术，利用40％的Pt／C催化剂制备质子交换膜燃料电池的核心部分膜电极组件。通过优化催化层中催化剂与Nation的最佳质量比以及扩散层的微孔层的聚四氟乙烯与碳粉的质量比以改进燃料电池的性能，并利用循环伏安、电化学阻抗谱等技术对电池的电化学性能进行了表征。研究表明催化层中催化剂与Nation的最佳质量比为3：1时，对应的电池的活性面积最大，欧姆阻抗和电荷传递阻抗最小。另外，研究还发现在恒电流条件下，当扩散层的微孔层中碳粉质量分数为2mg／cm^2，碳粉与PTFE的质量比为7：3时，放电性能最佳。

英文摘要：

Membrane electrolyte assembly （MEA） which is the key component for proton exchange membrane fuel cell （PEMFC） is prepared with 40% Pt/C by catalyst coated membrane （CCM） technique. The main aim of this study is to optimize the performance of fuel cell through change the ratio of Pt/C catalyst to Nation for the MEA and ratio of PTFE to carbon powder for gas diffusion layer. Furthermore, cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS） techniques are used to characterize the electrochemical properties of fuel cell. It is found that the optimum ratio of 40%Pt/C to Nation is 3：1 and the corresponding active surface area of MEA is the highest and the ohmic resistance and charge resistance are the lowest compared to the one in other ratio of catalyst to Nation. The optimal loading of carbon powder is 2 mg/cm^2 and the optimal ratio of polytet rafluoroethylene （PTFE） to carbon powder in the gas diffusion layer is 3：7.