【作者】 肖攀；

【导师】 唐浩林；

【作者基本信息】 武汉理工大学 ， 材料学， 2015， 硕士

【摘要】 自增湿膜电极是一种通过将质子交换膜燃料电池自身反应产生的水分用来给膜电极进行增湿的新型膜电极。这种膜电极主要是通过对膜电极材料进行自增湿改性或结构优化,使得膜电极能在低湿的条件下保持良好的保水吸湿性能或使得阴极的产物水反扩散到电解质膜和阳极。这种膜电极运用到燃料电池中,不仅能大大提高上述高温质子交换膜燃料电池和空冷质子交换膜燃料电池的电池输出性能,也能简化燃料电池系统结构和降低燃料电池的高昂成本,这对于未来燃料电池作为一种新能源设备运用于人类生产和生活,实现商业化具有非常重大的意义。本文对自增湿膜电极材料的研究主要包括两个方面:自增湿质子交换膜材料的研究和自增湿催化层亲水材料的研究。首先,本文通过探寻短链全氟磺酸材料在高温自增湿膜电极的质子交换膜中的物理及电化学方面的性能优势,并通过加入PTFE制备Aquivion/PTFE短链复合膜解决短链全氟磺酸质子交换膜在吸水后产生较大的溶胀应力而导致物理稳定性差的问题。制备出物理及电化学性能均优异的短链自增湿复合膜。另外,本文还研究通过静电自组装制备纳米亲水颗粒Nafion/Silica材料以替代传统Nafion树脂材料对催化层进行亲水改性的方式,提高膜电极催化层在低湿条件下的自增湿保水性能。制备出Nafion/SiO2自增湿催化层。通过相关测试分析,主要得出以下结论:本文主要结论有:(1)制备的Aquivion/PTFE短链复合膜在低湿条件下具有优异的电化学性能,并且由于PTFE基体膜的加入短链树脂膜的物理稳定性能也大大提高,是一种很好的自增湿质子交换膜材料;(2)制备的Nafion/SiO2纳米亲水颗粒替换传统Nafion树脂亲水材料运用于催化层中,在低湿条件下表现出更好的电池性能,是一种很好的自增湿催化层改性材料。但其性能与二氧化硅在其中的含量有关,当二氧化硅含量为6 wt%时电池性能表现最佳。更多还原

【Abstract】 The self-humidifying membrane electrode assembly(MEA) is a new type of MEA that humidifying the electrode by reusing the produced water of the cell reaction. This kind of MEA is mainly through the humidifying modification of membrane electrode materials or the structure optimization to the membrane electrode, making the membrane electrode keep good water retention or the produced water in the cathode diffusing to the electrolyte membrane and the anode side at the low humidity condition. Application of the self-humidifying membrane electrode assembly to the proton exchange membrane fuel cell can not only greatly improve the output performance of air-cooling fuel cell and high temperature proton exchange membrane fuel cell, but also can simplify the structure of fuel cell system and reduce the high cost of fuel cells. It has great significance with the future of fuel cell as a new type of energy equipment used in the industry and human life, and the commercialization of fuel cell.In this paper, the research mainly includes two aspects: the research of self-humidifying membrane materials and the research of self-humidifying catalytic layer hydrophilic materials. Firstly, we studied the physical and electrochemical performance advantages of short-side-chain(SSC) perfluorosulfonic acid(PFSA) to apply in high temperature self-humidifying membrane, then, we prepared an Aquivion/PTFE composite membrane by adding PTFE as the matrix to solve the physical stability problem of the SSC PFSA membrane caused by large swelling stress after absorbing water. Finally, we prepared a SSC PFSA self-humidifying composite membrane with excellent physical and electrochemical properties. In addition, in this paper we also studied the preparation of Nafion/Silica hydrophilic nanoparticles via electrostatic self-assembly function to replace traditional Nafion resin material to hydrophilic modification of catalytic layer, improving the water retention ability of catalytic layer under the condition of low humidity. Through some relevant test and analysis, the main conclusions draw as following:(1) The prepared Aquivion/PTFE SSC PFSA composite membrane has excellent electrochemical performance under the condition of low humidity, and the physical stability performance of SSC PFSA membrane is greatly improved due to the addition of PTFE matrix membrane, it is very superior self-humidifying proton exchange membrane materials;(2) The prepared Nafion/Silica hydrophilic nanoparticles to replace traditional Nafion hydrophilic resin material used in catalytic layer, it showed better fuel cell performance under the condition of low humidity, is a very good self-humidifying modification materials in catalytic layer. While, its performance is related to the content of silica in nanoparticles, the best content of silica is 6 wt%.更多还原