燃料电池的膜电极组件及其制法以及采用它的燃料电池

Membrane electrode assembly for fuel cell, method of preparing the same, and fuel cell using the membrane electrode assembly for fuel cell

Abstract

提供一种用于燃料电池的膜电极组件,其制备方法,及采用该用于燃料电池的膜电极组件的燃料电池。所述膜电极组件包括:阳极,其包括阳极基底、阳极扩散层和具有微孔的阳极催化剂层;阴极,其包括阴极基底、阴极扩散层和具有微孔的阴极催化剂层;以及介于阴极和阳极之间的电解质膜,其中所述阳极扩散层是亲水性的而阴极扩散层是疏水性的,并且阳极催化剂层的微孔的平均直径小于阴极催化剂层的微孔的平均直径。在所述膜电极组件中,空气可以容易地提供给阴极,水可以容易地流出阴极,从而得到膜电极组件的高性能,并且阳极催化剂层具有较小的微孔,从而提高阳极的耐久性并降低阳极催化剂层中甲醇的扩散速度,以长时间保持电池的初始性能。
A membrane electrode assembly for a fuel cell, a method of preparing the same, and a fuel cell using the membrane electrode assembly for a fuel cell. The membrane electrode assembly includes an anode comprising an anode substrate, an anode diffusion layer, and an anode catalyst layer having pores; a cathode comprising a cathode substrate, a cathode diffusion layer, and a cathode catalyst layer having pores; and an electrolyte membrane interposed between the cathode and the anode, wherein the anode diffusion layer is hydrophilic and the cathode diffusion layer is hydrophobic, and the average diameter of the pores of the anode catalyst layer is smaller than the average diameter of the pores of the cathode catalyst layer. In the membrane electrode assembly, air can be easily supplied to the cathode and water can easily flow out of the cathode, thereby obtaining high performance of the membrane electrode assembly, and the anode catalyst layer has relatively small pores, thereby improving durability of the anode and reducing the diffusion speed of methanol in the anode catalyst layer to maintain the initial performance of a battery for a long time.

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    CN-101420043-BOctober 10, 2012通用汽车环球科技运作公司Fuel cell stack with asymmetric diffusion media on anode and cathode