Abstract
In the present study, cathode side GDL of PEFC is modeled as a flat plate with many straight holes with different diameters. Using the model, the mechanism of flooding of PEFC is considered. In the study, water transmission and the oxygen diffusion through the holes are considered. As the generation volume of water in PEFC is very small compared with the volume necessary to overcome the pressure required for the water inflow through small conduits, small conduits are free from water inflow. Therefore, no flooding phenomenon occurs in GDL. It is thought that the relation between the thickness of the water layer between GDL and the catalyst layer and the limit of the amount of the oxygen diffusion is important for the flooding problem in the future.
