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聚合物电解质膜燃料电池(PEMFC)的微孔层对电池性能有重要影响。首次使用多壁碳纳米管(MWCNTs)在碳纸上先制备1层微孔层,再用碳黑(CB)在其上制备第2层微孔层,形成双层微孔层。从不同尺度上观察了微孔层(MPL)的形貌和结构,测量了气体扩散层(GDL)垂直向电阻,并测试了电池性能。结果表明,双层微孔层的平整程度与单独使用碳黑制备的微孔层相似,比单独使用MWCNTs制备的微孔层更加平整;双层微孔层的GDL垂直向的电阻比单层微孔层的GDL更小;使用双层微孔层制备的膜电极比相同碳载量下的单层微孔层制备的膜电极性能更好。
The microporous layer of a polymer electrolyte membrane fuel cell (PEMFC) has a significant impact on battery performance. For the first time, multi-walled carbon nanotubes (MWCNTs) were used to prepare a microporous layer on a carbon paper and a second microporous layer was formed thereon by using carbon black (CB) to form a double microporous layer. The morphology and structure of the microporous layer (MPL) were observed at different scales. The vertical resistance of the gas diffusion layer (GDL) was measured and the cell performance was tested. The results showed that the formation of the double-layer microporous layer was similar to that of the microporous layer prepared by using carbon black alone, and was more smooth than the microporous layer prepared by using MWCNTs alone. The vertical electrical resistance of the double- The GDL of the pore layer is smaller; the membrane electrode prepared by using the double-layer microporous layer performs better than the membrane electrode prepared by the single-layer microporous layer under the same carbon loading.