液料等离子喷涂SOFC复合阴极形成机制及其性能研究

项目名称： 液料等离子喷涂SOFC复合阴极形成机制及其性能研究

项目编号： No.51202220

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 王晓明

作者单位： 浙江师范大学

项目金额： 24万元

中文摘要： 本项目从固体氧化物燃料电池(SOFC)商业化角度出发，针对阴极极化为制约其输出性能提高的主要因素这一重要问题，提出采用液料等离子喷涂创制传统的YSZ/LSM复合阴极，通过控制微结构来降低阴极极化。本研究以液料先驱体为原料，通过控制等离子功率、喷涂距离、液料性质和基体温度等参数，研究阐明液滴在焰流中的行为及单个YSZ和LSM颗粒的沉积行为，探讨YSZ/LSM复合单元体沉积机制的影响规律；通过研究YSZ/LSM复合阴极中颗粒尺寸、分布状态、气孔结构及涂层内粒子之间及其与电解质表面的结合状态，阐明阴极的组织结构随制备条件及热处理温度的结构演变规律，揭示获得与基体结合良好、具有微纳介孔结构复合阴极的沉积条件；基于电池阴极极化与输出特性的表征，研究确立微纳介孔复合阴极三相界面结构的优化设计方法与制备规律，为高效构筑高活性阴极提供基础数据和理论基础，并为低成本化制备高输出功率密度的SOFC提供新方法。

中文关键词： 液料等离子喷涂；固体氧化物燃料电池；微纳介孔结构；YSZ/LSM复合阴极；阴极极化

英文摘要： The cathode polarization becomes main cause of the power losses in solid oxide fuel cell (SOFC). Therefore, it is essential to reduce the cathode polarization in order to improve the performance based on the commercialization of SOFC. In the present study, liquid precursor plasma spraying is employed to prepare traditional YSZ/LSM composite cathode for solid oxide fuel cells by controlling the cathode microstructure to reduce the cathode polarization. In this study, the liquid precursor is used as raw material. The behavior of droplets in the plasma jet and the deposition behavior of single YSZ and LSM particle is clarified by controlling plasma power, spray distance, the nature of the liquid precursor and substrate temperature. The influence law of the YSZ/LSM composite element deposition mechanism is discussed. The evolution mechanism of cathode organizational microstructure with preparation conditions and heat treatment temperature is explained by investigating particle size distribution, pore structure and combination state between particle and itself or electrolyte surface in YSZ/LSM composite cathode. The microstructure of deposits and the effect of annealing treatment on the cathode microstructure and cathode performance were investigated. The deposition conditions of composite cathode with the micro-nan

英文关键词： Liquid precursor plasma spraying；Solid oxide fuel cell；Micro-nano mesoporous structure；Composite cathode；Cathode polarization