Abstract
Cathode side gas diffusion layer (GDL) is modeled considering the behavior of water vapor, liquid water and oxygen diffusion. The model is consists of many parallel hydrophobic pores. By using the model, the current density at which water vapor starts to condense at catalyst side GDL is calculated for various values of GDL porosity and channel air humidity. As the results following results are obtained: the increase in the GDL porosity raises the current density at condensation initiation, and the increase in the supply air humidity reduces the current density.
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