• CN:11-2187/TH
  • ISSN:0577-6686

›› 2009, Vol. 45 ›› Issue (2): 75-80.

• 论文 • 上一篇    下一篇

质子交换膜燃料电池膜电极组件的制备

李冰; 林瑞; 杨代军;张存满;沈猛;马建新   

  1. 同济大学新能源汽车工程中心;同济大学汽车学院;华东理工大学资源与环境工程学院
  • 发布日期:2009-02-15

Preparation of Membrane Electrode Assemblies for Proton Exchange Membrane Fuel Cells

LI Bing;LIN Rui;YANG Daijun;ZHANG Cunman;SHEN Meng;MA Jianxin   

  1. Clean Energy Automotive Engineering Center, Tongji University School of Automotive Studies, Tongji University School of Resource and Environmental Engineering, East China University of Science of Technology
  • Published:2009-02-15

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Nafion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Nafion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2 mg/cm2,碳粉与PTFE的质量比为7∶3时,放电性能最佳。

关键词: Pt/C催化剂, 交流阻抗, 膜电极组件, 碳粉质量分数, 循环伏安

Abstract: 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 Nafion 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 Nafion 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 Nafion. The optimal loading of carbon powder is 2 mg/cm2 and the optimal ratio of polytet rafluoroethylene (PTFE) to carbon powder in the gas diffusion layer is 3:7.

Key words: Cyclic voltammetry (CV), Electrochemical impedance spectroscopy (EIS), Mass fraction of carbon powder, Membrane electrolyte assembly (MEA), Pt/C catalyst

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