Ceria-based electrolytes with high surface area and improved conductivity for intermediate temperature solid oxide fuel cells
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- 作者：P. Ramos-Alvarez ; M. E. Villafuerte-Castrejón ; G. González…
- 刊名：Journal of Materials Science
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：52
- 期：1
- 页码：519-532
- 全文大小：4,050 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Characterization and Evaluation Materials
Polymer Sciences
Continuum Mechanics and Mechanics of Materials
Crystallography
Mechanics - 出版者：Springer Netherlands
- ISSN：1573-4803
- 卷排序：52
文摘
High-purity-doped ceria compounds Ce1-xRExO2-δ (RE = Sm, Gd; 0 ≤ x ≤ 0.30) were synthesized by the Pechini method at 400 °C. Nanostructured products of crystallite size 5–11 nm were obtained, presenting a single fluorite cubic phase and high surface area values in the range of 75–110 m2g−1. Dense ceramic products with a relative density of 96–98 % resulted after sintering at 1450 °C. Impedance spectroscopy was used to study the conductivity of these compounds in the temperature range of 200–750 °C. Between 600 and 730 °C, the compounds with x = 0.15, 0.20 show conductivities on the order of 10−1 Scm−1, with activation energies between 0.9 and 1.1 eV. Surface areas and conductivity values were found to be comparable with the highest values reported in the literature for similar compounds.