当前位置: X-MOL 学术J. Eur. Ceram. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A new family of Cu-doped lanthanum silicate apatites as electrolyte materials for SOFCs: Synthesis, structural and electrical properties
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2018-08-31 , DOI: 10.1016/j.jeurceramsoc.2018.08.047
Tianrang Yang , Hailei Zhao , Mengya Fang , Konrad Świerczek , Jie Wang , Zhihong Du

La9.67Si6-xCuxO26.5-x (LSC, x = 0, 0.1, 0.3 and 0.5) are synthesized by a citric-nitrate method. Substitution Si with Cu promotes the densification process of silicate apatite. Unit cell parameters and volume increase linearly with Cu content. The Rietveld refinement reveals a much more distorted (Si,Cu)O4 tetrahedra in the oxygen stoichiometric La9.67Si5.5Cu0.5O26 sample. The structural observation from high temperature XRD implies a second-order phase transition in La9.67Si5.5Cu0.5O26. Cu-doping decreases the activation energy of oxygen ion conduction and increases the conductivity of LSC materials in the temperature range of 550–800 °C. La9.67Si5.5Cu0.5O26 shows the conductivity values of 29.3 and 12.3 mS cm−1 at 800 °C and 650 °C, respectively. The oxygen ion transference number of La9.67Si5.5Cu0.5O26 is higher than 0.99. These attractive properties make the La9.67Si5.5Cu0.5O26 a promising oxygen ion conducting electrolyte for applications of solid oxide fuel cells, oxygen sensors, oxygen separation membranes, etc.



中文翻译:

新型的掺杂铜的硅酸镧镧系磷灰石作为SOFC的电解质材料:合成,结构和电学性质

通过柠檬酸-硝酸法合成了La 9.67 Si 6-x Cu x O 26.5-x(LSC,x = 0、0.1、0.3和0.5)。用Cu取代Si促进了硅酸盐磷灰石的致密化过程。晶胞参数和体积随Cu含量线性增加。Rietveld精炼显示出,在化学计量比为La 9.67 Si 5.5 Cu 0.5 O 26的样品中,(Si,Cu)O 4四面体的变形更为严重。X射线高温XRD观察到的结构表明在La 9.67 Si 5.5 Cu 0.5 O 26中存在二级相变。在550–800°C的温度范围内,铜掺杂会降低氧离子传导的活化能并提高LSC材料的电导率。La 9.67 Si 5.5 Cu 0.5 O 26在800°C和650°C下的电导率分别为29.3和12.3 mS cm -1。La 9.67 Si 5.5 Cu 0.5 O 26的氧离子转移数高于0.99。这些吸引人的性能使La 9.67 Si 5.5 Cu 0.5 O 26一种有前景的氧离子导电电解质,可用于固体氧化物燃料电池,氧传感器,氧分离膜等。

更新日期:2018-08-31
down
wechat
bug