燃料电池一体式膜电极的制备及其性能研究

Preparation and performance of integrated membrane electrode assembly for fuel cells

膜电极结构设计对燃料电池性能输出具有重要影响。介绍了一种一体式膜电极的制备工艺,将Nafion®溶液直接涂布在气体扩散电极上成膜,整个膜电极可看做一体式结构。该制备过程不需要热压或冷压,可有效提高制备效率,降低制备成本。这种新型的一体式膜电极,Nafion®溶液可渗透到催化层空隙中,优化质子交换膜和催化层之间的界面接触,降低界面电阻,促进水的反向扩散,从而膜电极表现出优异的电池性能(峰值功率密度0.748 W/cm^(2))。

The structure of membrane electrode assembly(MEA)has an important influence on the performance of fuel cells.The preparation process of an integrated MEA was introduced.Nafion^(■)dispersion was directly coated on the gas diffusion electrode to form a membrane,and the entire MEA can be regarded as an integrated structure.The preparation process does not require hot or cold pressing,which effectively improves the preparation efficiency and reduces the preparation cost.During this unique preparation process,the perfluorosulfonic acid dispersion penetrates into the voids of the catalyst layers,facilitating the diffusion of water from the cathode to the anode.As a result,the integrated structure greatly reduces the interfacial resistance between the membrane and the catalyst layers,and single cells assembled with such integrated MEAs exhibit excellent performances(maximumpower density 0.748W/cm^(2)).