固体氧化物燃料电池电解质硅酸镧的制备及性能研究

发布时间：2018-05-05 20:33

  本文选题：固体氧化物燃料电池 + 电解质　； 参考：《华南理工大学》2014年硕士论文

【摘要】：固体氧化物燃料电池（Solid Oxide Fuel Cell，SOFC）是一种可以将化学能直接转化为电能的能源转化装置，对比传统的能源转化装置，，其具有能源转化效率高、全固态结构、污染小、噪声低、环境友好及实用性强等优点，具有广阔的发展前景。固体氧化物燃料电池主要组成部件有阴极、阳极和电解质，其中电解质是最为关键的部件，其性能直接决定着电池的工作温度和运行性能。磷灰石型镧硅化合物在中低温下显示出较高的电导率，使用磷灰石型镧硅化合物作为固体氧化物燃料电池可以有效提高电池转化效率、降低工作温度以及解决因高温而带来的电池部件连接、封装等问题，因而，磷灰石型镧硅化合物作为固体燃料电池电解质材料的研究具有重要意义，得到各国专家学者的广泛关注。 本文通过高温固相反应合成法在1450℃保温4小时制备出磷灰石型硅酸镧及镁掺杂的磷灰石型硅酸镧粉末，采用X射线衍射仪对粉末的晶型结构进行检测。然后采用大气压等离子体喷涂设备制备出硅酸镧电解质涂层和镁掺杂的磷灰石型硅酸镧电解质涂层，并对涂层做退火处理，同时使用脉冲高能强流电子束装置对镁掺杂的磷灰石型硅酸镧涂层表面进行处理，以研究其孔隙率的变化。通过X射线衍射仪、扫描电子显微镜（SEM）对涂层的晶型结构和表面形貌进行表征；采用压汞仪测试涂层的孔隙率；利用交流阻抗法对涂层电导率进行测量。实验制备的硅酸镧电解质涂层在800℃时的电导率为2.83×10-3S/cm，镁掺杂的磷灰石型硅酸镧电解质涂层在800℃时的电导率为9.68×10-3S/cm，而经过脉冲高能强流电子束处理后的硅酸镧电解质涂层和镁掺杂的磷灰石型硅酸镧电解质涂层在800℃时的电导率分别为6.78×10-3S/cm、1.24×10-2S/cm。
[Abstract]:Solid Oxide Fuel cell (SOFC) is a kind of energy conversion device which can convert chemical energy directly into electric energy. Compared with traditional energy conversion device, it has high energy conversion efficiency, all-solid structure, low pollution and low noise. Environmental friendly and practical advantages, has broad prospects for development. Solid oxide fuel cell (SOFC) consists of cathode anode and electrolyte. Electrolyte is the most important component and its performance directly determines the operating temperature and performance of the cell. Apatite lanthanum silicon compounds show high conductivity at moderate and low temperatures. Using apatite lanthanum silicon compounds as solid oxide fuel cells can effectively improve the conversion efficiency of the batteries. It is of great significance to study apatite lanthanum silicon compounds as electrolyte materials for solid fuel cells because of reducing working temperature and solving the problems of connection and encapsulation of battery components caused by high temperature. It has received extensive attention from experts and scholars from all over the world. In this paper, apatite type lanthanum silicate powder and magnesium doped apatite type lanthanum silicate powder were prepared by high temperature solid state reaction method at 1450 鈩

本文编号：1849198