| 摘要 |
Ail electrochemical fuel cell has a membrane-electrode assembly (MEA) having a cathode face and an anode face being disposed between a cathode fluid flow field plate and an anode fluid flow field plate. Each fluid flow field plate has fluid distribution conduits in a first surface thereof facing the respective cathode face or anode face of the MEA. A diffusion structure is disposed between the MEA and a respective one of the fluid flow field plates and has a first face in contact with or adjacent to the MEA and a second face in contact with or adjacent to the respective fluid flow field plate. The diffusion structure includes a first layer having a first level of hydrophobicity and a second layer being relatively hydrophilic compared to the first layer, the second layer being adjacent to the respective fluid flow field plate. The diffusion structure may have a first layer adjacent the respective fluid flow field plate and a second layer, the first layer having a relatively higher permeability than the second layer, the second layer being a support layer having a stiffness greater than that of the first layer.
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