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CN101897070B 燃料电池堆中扩散层的液态水渗透性的调节 有权 转让

燃料电池堆中扩散层的液态水渗透性的调节
摘要：
一种燃料电池堆(31)，包括多个燃料电池(9)，其中每个具有电解液如PEM(10)、阳极和阴极催化剂层(13、14)、阳极和阴极气体扩散层(16、17)、以及与该气体扩散层邻接的水传输板(21、28)。靠近该堆阴极端(36)的电池的阴极扩散层具有高透水性，如在约80℃和约1大气压下大于3×10-4g/(Pas m)，而在约80℃和约1大气压下靠近阳极端(35)的电池的阴极气体扩散层具有大于3×10-4g/(Pas m)的水蒸气渗透性。在一个实施方案中，靠近该堆阳极端(35)的电池的阳极气体扩散层具有比靠近阴极端的电池的阳极气体扩散层更高的液态水渗透性；第二个实施方案颠倒了该关系。
摘要（英）：

A fuel cell stack (31) includes a plurality of fuel cells (9) each having an electrolyte such as a PEM (10), anode and cathode catalyst layers (13, 14), anode and cathode gas diffusion layers (16, 17), and water transport plates (21, 28) adjacent the gas diffusion layers. The cathode diffusion layer of cells near the cathode end (36) of the stack have a high water permeability, such as greater than 3×10−4 g/(Pa s m) at about 80° C. and about 1 atmosphere, whereas the cathode gas diffusion layer in cells near the anode end (35) have water vapor permeance greater than 3×10−4 g/(Pa s m) at about 80° C. and about 1 atmosphere. In one embodiment, the anode gas diffusion layer of cells near the anode end (35) of the stack have a higher liquid water permeability than the anode gas diffusion layer in cells near the cathode end; a second embodiment reverses that relationship.

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