Abstract
This study characterizes the cell performance of a proton exchange membrane fuel cell (PEMFC) considering the counter flow of hydrogen and air. The effe cts of porosity of anode and cathode Gas Diffusion Layers (GDL) on current density, power density and mass transfer were investigated. Half -cell model was employed for computational analysis and parallel flow was simulated for process validation. The resul ts showed that the porosity affects the limiting current density especially in low cell voltages. Such condition is achievable in practice by diminishing the oxygen diffusion in the GDL. Also, the simulations confirmed an increase in power density by about 6 percent, when increasing the porosity of GDL by about 20 percent in the counter flow of PEMFC.
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