毕业论文移动版

摘要:伴随着生产力的不断发展，能源的紧缺和严重的环保问题接踵而至。这正是生产力与生产关系发展受阻的关键所在。在能源领域中，固体氧化物燃料电池(solidoxidefuelcell，SOFC)的特殊属性注定了它的不平凡，它可以在不造成任何污染的情况下将其他能源以较高的效率转换成电力，而受到全社会尤其是能源领域的重点关注，越来越多的科学家对固体氧化物燃料电池产生了浓厚的研究兴趣，并为之展开深刻的研究，使其成为了该领域的一个热点研究对象。连接体是固体氧化物燃料电池的关键材料之一,经过文献阅读和资料的搜索得出锰钴尖晶石（Mn1.5Co1.5O4）能提高金属连接体的在高温环境下抗氧化的能力，使得金属连接体在高温环境下具有良好的导电性能，防止不锈钢连接体里的Cr的氧化物向阴极中扩散沉积损坏电池，所以本文采用溶胶－凝胶法（Sol–Gel）制备纳米级Mn1.5Co1.5O4粉体，通过浆料涂覆法在不锈钢表面涂覆Mn1.5Co1.5O4涂层，用四电极法测试其电学性能具体研究内容及相关结论如下：

1）采用溶胶－凝胶法来制备Mn1.5Co1.5O4粉体。通过观察凝胶的稳定程度并采用XRD来表征粉体的物相组成和颗粒形貌。结果表明：在750℃下焙烧4h即可获得物相单一、大小均匀、结晶度高的纳米级Mn1.5Co1.5O4粉体。

（2）采用浆料涂覆法制备Mn1.5Co1.5O4涂层。通过SEM观察涂层的表面和横截面形貌。结果表明：试样经750℃烧结后，涂层与基体结合紧密、致密度高。当Mn1.5Co1.5O4粉末与粘结剂混合比例为3.5：2时，涂层粘附效果好且致密度高。

（3）用溶胶–凝胶法制备LNFO（LaNi0.6Fe0.4O3）样品并进行XRD和SEM表征，结果表明：在800℃下焙烧4h即可获得物相单一、大小均匀、结晶度高的纳米级LNFO粉体。涂层也与基体结合紧密、致密度高。线扫谱确定了Cr的扩散现象和Mn1.5Co1.5O4涂层对Cr元素氧化速率的抑制作用。

（4）组装了不锈钢/LNFO/不锈钢和不锈钢/Mn1.5Co1.5O4/LNFO/Mn1.5Co1.5O4/不锈钢两种样品.接下来对有无涂层的两组样片进行对照实验,先后进行接触电阻的测试,两者的电导率均随着温度的升高而增大,确定了Cr的扩散和Mn1.5Co1.5O4涂层对Cr元素氧化速率的抑制作用,含有Mn1.5Co1.5O4涂层的样品电导活化能小，电导率大。由数据来看，涂有涂层的电导率大约是没有涂层的电导率的10倍。

关键词：溶胶–凝胶法；LNFO；SOFC；Mn1.5Co1.5O4涂层

Abstract:With the continuous development of productivity, energy shortage and serious environmental problems followed. This is the key to the obstruction of productivity and production relations. In the field of energy, solid oxide fuel cell (SOFC) has a special property, that is, other energy in the case of no pollution in the case of relatively high efficiency into electricity, and by the whole society Especially in the field of energy focus, more and more scientists on the solid oxide fuel cell had a strong interest in research,  and to carry out a profound study, making it a hot research object in this field. Connecting body is one of the key materials of solid oxide fuel cell. through literature reading and searching, (Mn1.5Co1.5O4) can improve the high temperature oxidation resistance of metal connecting body, improve the conductive performance of metal connecting body under high temperature environment, prevent the oxide of Cr in stainless steel connecting body to the cathode, and damage the battery, So the nanometer Mn1.5Co1.5O4 powder was prepared by the sol–gel method. the coating was coated with Mn1.5Co1.5O4 coating on the surface of stainless steel by slurry coating method, and the electrical properties were tested by four electrode method. the specific research contents and relevant conclusions are as follows: (责任编辑：qin)