Modeling of Nafion 115 Membrane and GDL in Anode and Cathode Sides of a PEMFC

A numerical modeling of membrane and GDLs of PEMFCs is performed with regard to humidified air as the cathode inlet and humidified mixture of hydrogen and carbon dioxide as the anode inlet. The fuel cell (FC) is in steady-state condition. It is assumed that the FC is isothermal and the fluid composition in the anode and cathode flow channel is supposed to be uniform. The mixture of inlets is assumed to be saturated. The catalystlayer (CL) was considered as a very thin film. The systems of differential equations are solved by Runge Kutta 4th order method. The resistance of FC is increased by raising the total current density of FC; therefore the limiting current density of FC can be predicted. The membrane water content is reduced as fast as the total current density of FC is increased, so that the resistance of FC is raised and it causes to drop off the cell voltage of FC in high current density.

کلیدواژه ها:

GDL ، membrane ، water content ، electroosmotic drag ، back diffusion