In high current densities, PEMFCs suffer from concentration loss or, in other words, oxygen starvation . Some studies focused on the transport of oxygen . Reshetenko and Polevaya investigated a single cell open flow field PEMFC and reported the resistance against oxygen transport compared to a serpentine flow field PEMFC. The single-cell open flow field has lower transport resistance at oversaturated conditions. The resistance in GDL of a PEMFC was studied by Owejan et al. . They employed neutron imaging in limiting current density and showed the relation between water saturation and effective diffusion coefficient. They modified the Bruggeman relationship for two commercially available gas diffusion layer materials. Reshetenko and Ben studied the impact of GDL structure on oxygen mass transport. They reported that a microporous layer added to GDL does not enhance mass transport but water management. Baker et al. employed a limiting current density method. They unveiled the oxygen transport resistance in a multi-channel serpentine PEMFC. They described pressure-dependent and pressure-independent resistances and reported effective diffusion coefficients for plain Toray papers. The resistance in a parallel flow field PEMFC was studied by Wang et al. . They showed the influence of operating conditions on different kinds of diffusion resistance.