A porous diffusion media according to the present invention is positioned
against a catalyst layer of the membrane electrode assembly, the porous
matrix comprises carbon paper, and the water transfer particles comprise
carbon fibers or powders. Relatively high and relatively low water
transfer particle density regions alternate across the porous diffusion
media. A first major face of the media may be collectively more
hydrophilic than the second major face and the second major face may be
collectively more hydrophobic than the first major face. The diffusion
media is positioned against the catalyst layer along the first major face
of the diffusion media and against a flow field of the fuel cell along
the second major face of the diffusion media. The porous diffusion media
comprises hydrophobic material disposed along the second major face of
the diffusion media.