Sm0.5Pr0.5aCo2O5+δ阴极材料的制备与表征毕业论文.doc

毕业论文（设计）材料 题 目： 学生姓名： 学生学号： 0807030211 系 别： 化学与化工系 专 业： 材料化学 届 别： 2012届 指导教师： 目 录 摘 要 (1) Abstract (1) 前言 (2) 1 实验部分 (4) 1.1 试剂与仪器 (4) 1.2 初级粉体的合成 (4) 1.3 样品制备与表征 (5) 1.3.1 样品制备 (5) 1.3.2 性能表征 (5) 2 结果与讨论 (6) 2.1 XRD分析 (6) 2.1.1 物相分析 (6) 2.1.2 化学相容性分析 (6) 2.2 热膨胀系数分析 (7) 2.3 电导率 (8) 2.4 单电池性能 (8) 2.5 SEM分析 (9) 2.6 电池阻抗谱分析 (10) 3 结论 (11) 致谢 (12) 参考文献 (12) 阴极材料的制备与表征 学生：胡杰 指导老师：陈永红 淮南师范学院化学与化工系 摘 要：采用柠檬酸-硝酸盐法制备了Sm0.5Pr0.5BaCo2O5+δ(SPBC)粉体，重点考察了Sm0.5Pr0.5BaCo2O5+δ的电化学性能。利用XRD和SEM 对其相结构和微观形貌进行表征，直流四端子法测量该材料在中温（400～800℃）范围内的电导率，交流阻抗谱测试阴极材料的极化电阻用热膨胀仪测定陶瓷体的热膨胀系数（TEC）。结果表明：SPBC在1100℃以下不与SDC发生反应，单电池中阳极，电解质与阴极界面结合良好，且阴极气孔较多 400℃时，样品的电导率292S·cm-1，Sm的加入降低了SPBC的TEC以H2为燃料气（含体积分数3%水蒸气），空气为氧化剂，600℃时极化电阻为0.?·cm2，开路电压为0.78V，电功率密度为447mW·cm-2，预示着SPBC是一种潜在的IT-SOFC阴极材料。 关键词：固体氧化物燃料电池；双钙钛矿；S0.5Pr0.5BaCo2O5+δ(SPBC)阴极材料；电导率 Preparation and Characterization of Sm0.5Pr0.5BaCo2O5+δ cathode materials Student: Hujie Instructor: Chen Yong-hong Department of Chemistry and Chemical Engineering, Huainan Normal University Abstract: The powders of Sm0.5Pr0.5BaCo2O5+δ (SPBC) as cathode materials were prepared by the citric acid nitrate method. The double perovskite structure and microcosmic appearance was characterized by XRD and SEM., Sm0.5Pr0.5BaCo2O5+δ is the main one. The electrical conductivities of the materials at 400~800℃ were measured by four-probe technique, the polarization of the cell and thermal expansion coefficient (TEC) were characterized by AC impedance spectroscopy and thermal dilatometry, respectively. The results indicate that there were no interactions between SPBC and SDC in 1100℃. The single cell has good interface between anode, electrolyte and cathode, what’s more, it has many pores in cathode; The electrical conductivity of the SPBC cathode reached to 292 S