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.
doi:
10.3866/PKU.WHXB20051206
Citation: 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. doi: 10.3866/PKU.WHXB20051206
Citation: 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. doi: 10.3866/PKU.WHXB20051206
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
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.
English
Synthesis and Properties of La0.5RE0.3Sr0.2FeO3－δ (RE = Nd, Ce, Sm) System with Two Rare Earths for Cathodes
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.
扫一扫看文章
计量
- PDF下载量: 2719
- 文章访问数: 3793
- HTML全文浏览量: 19
下载:
