物理化学学报 >> 2005, Vol. 21 >> Issue (12): 1357-1362.doi: 10.3866/PKU.WHXB20051206

研究论文 上一篇    下一篇

La0.5>RE0.3Sr0.2FeO3－δ (RE = Nd、Ce、Sm)体系双稀土阴极材料的制备与电性能

陈永红;魏亦军;仲洪海;高建峰;刘杏芹;孟广耀   

  1. 中国科学技术大学材料科学与工程系, 合肥 230026；淮南师范学院实验信息中心,安徽淮南 232001
  • 收稿日期:2005-04-21 修回日期:2005-06-24 发布日期:2005-12-15
  • 通讯作者: 刘杏芹 E-mail:xqliu@ustc.edu.cn

Synthesis and Properties of La0.5RE0.3Sr0.2FeO3－δ (RE = Nd, Ce, Sm) System with Two Rare Earths for Cathodes

CHEN Yong-Hong;WEI Yi-Jun;ZHONG Hong-Hai;GAO Jian-Feng;LIU Xing-Qin;MENG Guang-Yao   

  1. 1Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026; 2Center of Experiment and Communication, Huainan Normal College, Huainan 232001
  • Received:2005-04-21 Revised:2005-06-24 Published:2005-12-15
  • Contact: LIU Xing-Qin E-mail:xqliu@ustc.edu.cn

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摘要： 采用甘氨酸-硝酸盐法(GNP)合成了La0.5RE0.3Sr0.2FeO3－δ(RE=Nd、Ce、Sm)系列复合氧化物粉体. 用X射线衍射(XRD)和TG-DSC分析了样品钙钛矿物相的形成过程, 用Archimedes排水法测量体积密度并计算烧结样品的相对密度, 用四端子技术测量电导率. 结果显示, 掺Nd的样品1200 ℃烧结2 h成为单一立方钙钛矿结构, 掺Ce样品有明显的CeO2立方相析出, 掺Sm样品主相为钙钛矿结构伴有微弱的杂峰. 1250 ℃烧结2 h的La0.5Nd0.3Sr0.2FeO3－δ在600 ℃时电导率高达100 S•cm-1以上, 明显高于La0.5Ce0.3Sr0.2FeO3－δ及La0.5Sm0.3Sr0.2FeO3－δ样品的电导率, 预示着La0.5Nd0.3Sr0.2FeO3－δ可能是一种良好的中温固体氧化物燃料电池(SOFC)阴极材料.

关键词: La0.5RE0.3Sr0.2FeO3－δ(RE = Nd、Ce、Sm), 固体氧化物燃料电池, 钙钛矿, 阴极

Abstract: Two rare earths composite oxides of La0.5RE0.3Sr0.2FeO3－δ(RE = Nd, Ce, Sm) with A-site doped Sr2+ samples were synthesized by Glycine-Nitrate processes (GNP). The formation process of the perovskite structure was analyzed by means of X-ray powder diffraction and TG-DSC. The relative density of the ceramics was measured by Archimedes method, and the electrical conductivity of the samples was studied by four-probe technique. The results show that the sample for RE = Nd presents a single perovskite-type phase with a cubic symmetry after sintering at 1200 ℃ for 2 h, while the samples with Ce doped showed a separated cubic phase of CeO2, and the specimen doped with Sm is a cubic perovskite-type phase accompanied by some faint impure peaks. The electrical conductivity of La0.5Nd0.3Sr0.2FeO3－δ (LNSF) sample obtained from being sintered at 1250 ℃ for 2 h was over 100 S•cm-1, significantly higher than that of the La0.5Ce0.3Sr0.2FeO3－δ(LCSF) and La0.5Sm0.3Sr0.2FeO3－δ (LSSF) at the same conditions. The results indicate that La0.5Nd0.3Sr0.2FeO3－δ may be a suitable cathode material for intermediate temperature SOFC.

Key words: La0.5RE0.3Sr0.2FeO3－δ(RE = Nd, Ce, Sm), SOFC, Perovskite-type, Cathodes