质子交换膜燃料电池CCM膜电极

Catalyst coated membrane for proton exchange membrane fuel cell

采用喷涂工艺制备了三合一(CCM,Catalyst Coated Membrane)型质子交换膜燃料电池膜电极,研究了分散剂、催化剂、质子交换膜对膜电极性能的影响。结果表明:CCM型膜电极的放电性能好于传统热压方法制备的膜电极;乙醇、异丙醇和乙二醇等水溶液分散剂对CCM膜电极中低电流密度区放电性能影响不大,而在高电流的浓差极化控制区乙二醇最佳,而乙醇最差;优化催化剂的Pt担量和阴极催化剂的用量能够显著提高膜电极的性能,而通过减小质子交换膜的厚度,降低膜的面电阻可以进一步提高膜电极的放电性能。

Catalyst coated membranes（CCM） were prepared with spray process for proton exchange membrane fuel cell. The influences of dispersing agent, catalyst and membrane on the performance of membrane electrode assembly （MEA） were investigated. The results show that compared with the MEA prepared by hot-press process, the catalyst coated membrane shows a better performance. Three MEAs.using ethanol, isopropanol and ethylene glycol as dispersing agents during making catalyst ink exhibited similar polarization characteristics from low to middle current density, while on high current density ethylene glycol is the best dispersant and ethanol is the worst. The performance of MEA can be enhanced through optimizing the amount of Pt supported on carbon and the total catalyst loading on cathode. Further improvement of the performance of MEA can be realized by using thinner membrane to reduce area resistance.