A new family of Cu-doped lanthanum silicate apatites as electrolyte materials for SOFCs: Synthesis, structural and electrical properties
| Autor: | Zhihong Du, Hailei Zhao, Konrad Świerczek, Jie Wang, Tianrang Yang, Mengya Fang |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Rietveld refinement Oxide chemistry.chemical_element 02 engineering and technology Electrolyte Atmospheric temperature range Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Oxygen chemistry.chemical_compound chemistry Chemical engineering 0103 physical sciences Materials Chemistry Ceramics and Composites Lanthanum 0210 nano-technology Oxygen sensor |
| Zdroj: | Journal of the European Ceramic Society. 39:424-431 |
| ISSN: | 0955-2219 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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