سال انتشار: ۱۳۸۹

محل انتشار: چهارمین همایش پیل سوختی ایران

تعداد صفحات: ۱۲

نویسنده(ها):

Mohamad Jafar Kermani – Department of Mechanical Engineering, 424 Hafez Avenue Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran
Masoumeh Javaheri – Department of Chemistry, Faculty of Science, Tarbiat Modares University P.O. Box 14115-175, Tehran, Iran
Davood Ghadiri Moghaddam – Department of Mechanical Engineering, 424 Hafez Avenue, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran

چکیده:

In the present work, the saturation influence of the cathode catalyst layer (CCL) of proton exchange membrane fuel cell (PEMFC) on cell performance is studied. For this mean, a steady- state, macro-homogeneous catalyst layer (CL) model is used to investigate the effect of various saturation conditions. This model solves the governing equations for the oxygen diffusion; the rate of electrochemical reactions; and transports of protons and electrons through the membrane and solid phases, respectively. The cathode CL contains: membrane, solid, catalyst particles and void spaces. The void spaces are assumed to be various saturation of liquid water (100, 70 and 50%); therefore, the oxygen species must diffuse in liquid- and vapor-water and ionomer phase to reach to the active sites. Simulation results show that cathode CL saturation plays very important role on the PEMFC performance. Improved performances are achieved at saturation levels of CCL 50 to 70%, as oxygen diffuses in vapor much easier than in fully flooded CCL