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During PEFC’s operation the reactant gas is fed to the cell through the gas diffusion layer (GDL) and through the same material the product water is removed. Water accumulation near the catalyst can block the gas access causing an increase of the mass transport losses. On the other hand, PEFC’s work with a solid electrolyte membrane that needs to be hydrated in order to be proton conductive. In order to obtain the maximum performance PEFC’s require a well-balanced water management.