LaGaO_3基固体电解质制备、性能表征及在SOFC中的应用
文献类型：学位论文
| 作者 | 尧巍华 |
| 学位类别 | 硕士 |
| 答辩日期 | 1999-07-20 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 戴学刚 |
| 关键词 | 固体氧化物燃料电池 固体电解质 相转移分离法 镓酸镧 粉末制备 |
| 其他题名 | Studies on Preparation and Characteristics of LaGaO3-based Electrolyte and Its Application in SOFC |
| 中文摘要 | LaGaO_3基固体电解质是目前固体氧化物燃料电池电解质领域研究的新热点。本工作对锶镁掺杂的镓酸镧（LSGM）电解质的制备方法、性能和在SOFC中的应用作了初步的研究。用相转移分离法制备了LSGM粉末，粉末的比表面积达到了22.4m~2/g。优化了相转移分离法的工艺路线，使用了非离子表面活性剂取代含Na离子的活性剂，解决了Na离子的影响问题。LSGM电解质的烧结密度为6.28g/cm~3，是理论密度的94%。在测量温度范围内的氧离子迁移数接近于1。离子电导率和绝对温度乘积的对数和绝对温度的倒数近似为线性关系，符合经典的Arrhenius经验方程。以Ni为阳极、锰酸镧锶（LSM）为阴极，LSGM为电解质的SOFC实验电池的最大功率密度和最大电流密度分别为68mW/cm~2和126mA/cm~2。 EDS法分析了实验电池阳极－电解质－阴极断面的元素分布，发现电解质的主要成分之一的Ga从电解质层扩散到阴极层。另外还观察到在阳极－电解质界面上La和Ni的互扩散现象。这些现象可能是导致本实验电池功率密度和电流密度偏低的主要原因。 |
| 英文摘要 | LaGaO_3-based electrolyte is one of the most promising electrolytes of SOFC. This study is concerned with the preparation, characteristics and the application of SrO and MgO doped LaGaO_3(LSGM) in SOFC. A phase-transfer-separation route was used to prepare the ultra-fine powder of LSGM, the specific surface area of the powder was obtained at 22.4m~2/g. And the preparing conditions of the process were optimized. A non-ion surfactant, sorbitan trioleate (Span-85), was selected to replace the commonly used dodecylbenzene sulfonic acid sodium salt. As the existence of Na in the salt would deteriorate sintering and electrochemical properties of the LSGM electrolyte. The sintered density of LSGM was measured at 6.28g/cm~3, which is 94% of theoretical density, and the oxygen ion transference numbers were close to unity at all testing temperatures. Moreover, the relationship between the ion conductivity and absolute temperature obeyed the classical Arrhenius equation. The power density and maximum current density of the testing SOFC cell, which was constructed with Ni anode, La_(0.8)Sr_(0.2)MnO_3(LSM) cathode and LSGM electrolyte, were 68mW/cm~2 and 126mA/cm~2 respectively. Energy dispersive spectrum (EDS) was used to detect the contents of different elements across the intersection of the Ni-LSGM-LSM. The diffusion of Ga from LSGM to LSM was detected, which effected the composition and ion conductivity of LSGM. Furthermore, the presence of Ga in LSM possibly deteriorated electro-catalytic properties of the cathode. The diffusion of La and Ni across the interface of LSGM and Ni was also detected. These reasons could explain the lower power density and current density of the present testing cell. |
| 语种 | 中文 |
| 公开日期 | 2013-09-27 |
| 页码 | 69 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1985]  |
| 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 | 尧巍华. LaGaO_3基固体电解质制备、性能表征及在SOFC中的应用[D]. 中国科学院研究生院. 1999. |
入库方式： OAI收割
来源：过程工程研究所
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