| Pr0.6-xNdxSr0.4FeO3-δ电极材料的光谱及性能研究 |
| Spectrum and Performance of Pr0.6-xNdxSr0.4FeO3-δ Cathode |
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| 摘要: 以柠檬酸-硝酸盐自蔓延燃烧法合成了ABO3型钙钛矿结构的Pr0.6-xNdxSr0.4FeO3-δ(x=0.0～0.6)系列稀土复合氧化物粉体。利用傅立叶变换红外光谱(FTIR)和激光共焦拉曼光谱(LRS)对产物的晶体结构进行了表征。分别采用热膨胀仪测定烧结陶瓷体的热膨胀系数(TEC)；TG-DTA记录材料的热稳定性；XRD研究阴极材料与中温电解质Sm0.2Ce0.8O1.9(SDC)及La0.8Sr0.2Ga0.8Mg0.2O3-δ(LSGM)的化学相容性；SEM观察阴极/电解质复合材料的断口形貌。结果表明，该系列样品在高、低温热循环过程中化学稳定、晶型稳定；在室温至1 100 ℃范围内的平均热膨胀系数为1.16 × 10-5 K-1，与SDC及LSGM的热膨胀系数十分接近。阴极/电解质混合粉体1 200 ℃煅烧10 h，XRD未检测到新物质；SEM显示复合层断面界面清晰，没有相互扩散现象。该体系有望成为以SDC或LSGM为电解质的中温固体氧化物燃料电池合适的阴极材料。 |
| 关键词: 阴极材料 光谱 热膨胀系数 热稳定性 化学相容性 |
| 基金项目: |
| Abstract: Perovskite-type Pr0.6-xNdxSr0.4FeO3-δ (x=0.0～0.6) solid solution powders with two rare earths at A-site of ABO3 were synthesized using a self-propagating combustion method in citric acid-nitrate. The crystalline structure of the sample was characterized by FTIR and Laser Raman Spectroscope (LRS). The thermal expansion coefficient (TEC) was measured by dilatometer, and thermal stability was recorded via simultaneous thermogravimeter and differential thermal analyzer (TG-DTA). The chemical compatibility between cathode materials and intermediate-temperature electrolytes such as Sm-doped CeO2 (SDC) and/or Sr-doped LaGaO3 (LSGM) were also investigated by X-ray diffraction (XRD). The cross-section morphology of cathode-electrolyte was studied by scanning electron microscope (SEM). The results show that the composition and crystalline structure of the ceramics are stable in the cycle of low-high temperatures. The mean TEC value at room temperature to 1 100 ℃ is about of 1.16 × 10-5 K-1, which corresponds with that of the SDC and/or LSGM. As revealed by XRD, there is no new phase detected after sintering the mixed powders of cathode and SDC or LSGM at above 1 200 ℃ for 10 h. Morphology observation by SEM indicates that the interface of cathode-electrolyte is clear and no visible diffusion particles are observed. |
| Keywords: cathode materials spectrum TEC thermal stability compatibility |
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| 陈永红,徐俊,魏亦军,刘杏芹,孟广耀.Pr0.6-xNdxSr0.4FeO3-δ电极材料的光谱及性能研究[J].无机化学学报,2006,22(11):1941-1946. |
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