2-Substituted imidazole derivatives doped Nafion membrane for high temperature anhydrous application and their performance
2-Substituted imidazole derivatives doped Nafion membrane for high temperature anhydrous application and their performance
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DOI：
10.1360/032011-402
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
Wei Li;Qiong Li;Z. Tu;Haining Zhang;M. Pan
中科院分区：
文献类型：
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作者：
Wei Li;Qiong Li;Z. Tu;Haining Zhang;M. Pan
高温质子交换膜燃料电池的技术障碍之一是膜在降低的相对湿度下应具有合理的质子传导率。本文通过流延工艺制备了含有Nafion 和2-取代咪唑衍生物的膜。通过在咪唑的2位接枝疏水性烃链，咪唑部分被固定在形成的膜内。如此形成的膜的质子电导率在160℃、无水条件下达到6.8×10-3 S cm-1。与原始Nafion膜相比，形成的膜的热稳定性得到增强。通过静电力显微镜观察了相互连接的离子簇的形成。基于质子传输的活化能，提出了120℃以下和以上的质子传输机理。
One of the technical barriers for high temperature proton exchange membrane fuel cell is the membrane that should have reasonable proton conductivity at reduced relative humidity. In this paper, membranes containing Nafion and 2-substituted imidazole derivatives have been formed through casting process. Imidazole moieties are immobilizied inside the formed membrane though grafting of hydrophobic hydrocarbon chains at 2-position of imidazole. The proton conductivity of the so-formed membranes reaches 6.8×10-3 S cm-1 at 160 °C under anhydrous conditions. Compared to pristine Nafion membrane, the thermal stability of the formed membranes is enhanced. The inter-connected ionic clusters formation has been observed through electrostatic force microscopy. Based on activation energy for proton transportation, the mechanism of proton transportation below and above 120 °C is proposed.