固体氧化物燃料电池阴极柔性接触材料的研究
文献类型：学位论文
| 作者 | 方丽萍 |
| 学位类别 | 硕士 |
| 答辩日期 | 2010-06-07 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 谢朝晖 ; 朱庆山 |
| 关键词 | 锰酸镧锶 纤维布 阴极柔性接触材料 固体氧化物燃料电池 |
| 其他题名 | Flexible Contact Materials for SOFC Cathodic Applications |
| 学位专业 | 化学工程 |
| 中文摘要 | 固体氧化物燃料电池(SOFC)是一种能量转换效率高、对环境友好和燃料适应性广的能源转换装置，被誉为21世纪的高效绿色能源。SOFC通过连接极把一系列的单电池连接起来形成电池堆以获得较大的功率输出。金属连接极因其较高的电子电导率、廉价、易加工等优点成为中温固体氧化物燃料电池连接极的首选材料，然而金属连接极和陶瓷阴极材料的陶瓷/金属界面会导致界面接触电阻很高，严重影响电池堆性能。目前的解决方法是加入贵金属和陶瓷涂层接触材料，但是贵金属成本太高，而陶瓷涂层仍然是陶瓷和陶瓷两个硬表面接触，有效接触面积很小，导致接触电阻偏高。本文提出研制柔性锰酸镧锶（La0.8Sr0.2MnO3）纤维布作为SOFC阴极接触材料，采用前驱体溶液浸渍法制备锰酸镧锶纤维布，研究比较了不同的前驱体原料纤维布：粘胶纤维布、棉纤维布和涤纶纤维布以及不同的热处理温度对锰酸镧锶纤维布的物相组成、宏观和微观结构以及力学性能的影响，通过优化制备工艺，获得高性能阴极柔性接触材料。取得了如下的研究结果：浸渍溶液的浓度对纤维布的吸附增重率影响最大，并进而影响最终制品的强度。发现粘胶纤维布最适合作为制备锰酸镧锶纤维布的前驱体，由粘胶纤维布制得的锰酸镧锶纤维布在同等条件下吸附增重率最高，强度最高。利用X射线衍射（XRD）和扫描电子显微镜（SEM）对制得的锰酸镧锶纤维布的物相与微观形貌进行表征，结果表明通过前驱体溶液浸渍法可以制备出连续、致密的锰酸镧锶陶瓷纤维毡，该纤维毡具有与前驱体布相同的物理结构形貌。采用自行设计装置测量锰酸镧锶纤维布的拉伸强度，经1050~1200 oC高温烧结4 h后纤维布的拉伸强度平均达到279.7 kPa，基本满足使用要求。采用两探针四点法对锰酸镧锶纤维布接触材料和金属连接极（SUS 430）界面的面积比电阻（Area Specific Resistance, ASR）进行了研究，发现经800 oC空气氧化200 h后界面ASR从 26 mΩ·cm2缓慢增加到33 mΩ·cm2，远低于没有添加接触层的ASR增长速率。 |
| 英文摘要 | Solid oxide fuel cell (SOFC) has attracted much attention because it can convert the energy of a fuel directly into electricity in an efficient, environmental benign and fuel flexible way, and has been regarded as the green power source in the 21st century. In SOFCs, multiple cells are needed to be stacked in series via interconnects in order to obtain sufficient power output. With the excellent electronic conductivity, low cost and good mechanical properties, iron-based alloys are considered as one of the most promising candidate materials for intermediate temperature SOFC interconnects. However, ceramic/metal interfaces formed by iron-based alloys and ceramic cathodes contribute to a high contact resistance, often resulting in a rapid degradation of fuel cell performance. Noble metals and ceramic pastes have been used as contact materials, but noble metals are too expensive and thus cost-prohibitive for large-scale commercial applications，while ceramic pastes still lead to the contact of two hard surfaces of ceramics, which causes a very small effective contact area and thus a high contact resistance. The purpose of the present study was to develop a novel flexible ceramic contact material —LSM cloth (La0.8Sr0.2MnO3), which was prepared by an infiltration-calcination-sintering method. The effect of various precursory cloths (viscose fiber, cotton fiber and polyester fiber) and heat treatment on the phase composition, macro and microstructure and mechanical properties of the as-prepared LSM cloths were investigated. LSM flexible contact materials were successfully prepared through optimization of preparation processes and process parameters. The main conclusions were as follows: The concentration of the infiltration solution had the most significant influence on the amount of salts adsorbed and the tensile strength of the as-prepared LSM cloth. The viscose fiber cloth was found to be the most appropriate precursor for preparing LSM cloths after comparing various precursory cloths under the same condition. The phase and microstructure of the as-prepared LSM cloth were studied by XRD and SEM. Results revealed that continuous and dense LSM ceramic fibers could be obtained by the method, and the as-prepared LSM cloth possessed the same physical structure as the precursory cloth. The tensile strength of LSM cloths that were sintered at 1050~1200 oC for 4 h and measured by a self-designed device was improved to 279.7 kPa, which was sufficient for the SOFC applications. The “4-probe” method was employed to determine the area specific resistance (ASR) of the interface between the LSM cloth and SUS 430 interconnect. After long-term exposure (200 h）in air at 800 oC the value of ASR of the interface increased quite slowly from 26 mΩ·cm2 to 33 mΩ·cm2, far below the growth rate without contact materials. |
| 语种 | 中文 |
| 公开日期 | 2013-09-17 |
| 页码 | 54 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1499]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 方丽萍. 固体氧化物燃料电池阴极柔性接触材料的研究[D]. 中国科学院研究生院. 2010. |
入库方式： OAI收割
来源：过程工程研究所
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