铜离子对PEMFC膜电极性能影响及恢复方法

为了研究铜离子对质子交换膜燃料电池膜电极组件性能的影响并提出相应的恢复方法,采用X射线衍射分析法检测了金属极板腐蚀后附着在膜电极表面的污染物成分,并采用稀H2SO4溶液沸腾的方法去除污染物并恢复膜电极性能.结果表明,金属极板的防腐层存在缺陷时,极板在缺陷处被腐蚀,并且金属离子严重影响膜电极的性能.采用c=0.2 mol/L的稀H2SO4沸腾的方法能去除膜电极表面的金属离子并恢复其性能.对于热压三合一的膜电极组件,采用稀硫酸沸腾的方法会破坏碳纸的疏水性,不如分体式膜电极的恢复效果好.

Effect of Copper Ion on MEA and Performance Recovery of MEA of PEMFC

To study the effect of copper ion on the membrane electrode assembly(MEA) of a proton exchange membrane fuel cell(PEMFC) and the recovery method of performance of PEMFC with the MEA that was eroded by the copper ion,the contamination on the surface of the MEA was examined by the X-Ray Diffraction(XRD) and the boiling method to renew the performance of MEA was performed.In experiments,it is found that the metal polar plates were eroded because of some flaws on gold film of the plates,and the copper ion dramatically influenced the performance of the MEA.The experimental results indicate that the method of boiling MEA in 0.2?m diluted sulfuric acid could take off copper ion from MEA surface and renew the performance of MEA.The effect of the method for separated membrane electrode assembly is better than that for hot-pressed sandwiched membrane electrode assembly because the hydrophobicity of carbon paper could be poorer after the carbon paper is boiled in diluted sulfuric acid.