降低直接甲醇燃料电池浓差极化的含磺化碳管阻水夹层的构建

Constructing a Water-blocking Interlayer Containing Sulfonated Carbon Tubes to Reduce Concentration Polarization in Direct Methanol Fuel Cells

采用直接接枝法,将来自对氨基苯磺酸的苯磺酸官能团引入氧化多壁碳纳米管,制得磺化多壁碳纳米管(SO_(3)-MCNT).再以SO_(3)-MCNT为填料,以Nafion离聚物为黏结剂,利用超声喷涂在商业N212质子交换膜一侧构建了新的膜层,获得了一种复合膜(SO_(3)-MCNT-N212).使用SO_(3)-MCNT-N212制备燃料电池膜电极(MEA),并用于直接甲醇燃料电池(DMFC)测试.与使用普通N212膜的膜电极相比,该膜电极的性能得到明显提升.进一步分析表明,SO_(3)-MCNT膜层的引入降低了阳极向阴极的跨膜水迁移作用,缓解了阴极的水淹,从而降低了浓差极化,提升了膜电极的性能.

The sulfonated multi-wall carbon nanotubes(SO_(3)-MCNT)were prepared by introducing the benzenesul fonic acid functional group from 4-aminobenzenesulfonic acid into the oxidized multi-walled carbon nanotubes by direct grafting method.The prepared sulfonated multi-walled carbon nanotubes were used as fillers and Nafion ionomer as binder to construct a new membrane layer upon one side of a commercial N212 proton exchang membrane using ultrasonic spraying,and then a composite membrane(SO_(3)-MCNT-N212)was obtained.The com posite membrane was used to prepare fuel cell membrane electrode assembly(MEA)for direct methanol fuel cel(DMFC)testing.Compared with the MEA samples using ordinary N212 membrane,the performance of this MEA ha been significantly improved.Further analysis showed that the introduction of the sulfonated multi-walled carbon nanotube membrane layer is able to reduce the transmembrane water migration from the anode to the cathode,alleviate the cathode flooding,thereby reducing the concentration polarization and improving the performance of the MEA.