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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
引用本文:陈永红,魏亦军,仲洪海,高建峰,刘杏芹,孟广耀.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[J].物理化学学报,2005,21(12):1357-1362.
作者姓名:陈永红  魏亦军  仲洪海  高建峰  刘杏芹  孟广耀
作者单位:1.Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026;2.Center of Experiment and Communication, Huainan Normal College, Huainan 232001
基金项目:安徽省教育厅自然科学基金(2004kj326)资助项目~~
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  
收稿时间:2005-04-21
修稿时间:2005-06-24

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.Synthesis and Properties of La0.5RE0.3Sr0.2FeO3-δ (RE=Nd, Ce, Sm) System with Two Rare Earths for Cathodes[J].Acta Physico-Chimica Sinica,2005,21(12):1357-1362.
Authors:CHEN  Yong-Hong  WEI  Yi-Jun  ZHONG  Hong-Hai  GAO  Jian-Feng  LIU  Xing-Qin  MENG  Guang-Yao
Institution:1.Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026;2.Center of Experiment and Communication, Huainan Normal College, Huainan 232001
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.
Keywords:La0  5RE0  3Sr0  2FeO3-δ(RE = Nd  Ce  Sm)  SOFC  Perovskite-type  Cathodes
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