Synthesis and characterization of Pr/Gd co-doped ceria by using the citric acid–nitrate combustion method
| Autor: | Aliye Arabaci |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Scanning electron microscope Analytical chemistry Oxide Sintering 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention Dielectric spectroscopy chemistry.chemical_compound chemistry law Relative density Ionic conductivity General Materials Science Calcination 0210 nano-technology |
| Zdroj: | Solid State Ionics. 326:69-76 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2018.09.012 |
| Popis: | A series of Ce0.8Gd0.2−xPrxO1.90 (x = 0–0.10) compositions have been synthesized by citric acid–nitrate combustion method for intermediate temperature solid oxide fuel cells (ITSOFCs). Characterization studies were carried out with X-ray diffraction (XRD), scanning electron microscopy (SEM) and AC impedance spectroscopy. X-ray diffraction results showed that a single-phase fluorite structure formed at a relatively low calcination temperature which is 600 °C. Dense Ce0.8Gd0.2−xPrxO1.90 pellets were successfully prepared by sintering at 1400 °C for 6 h. The relative density of Ce0.8Gd0.2−xPrxO1.90 samples was over 94% of the theoretical density. The two-probe AC impedance spectroscopy was used to study the ionic conductivity of co-doped ceria samples. According to the electrochemical impedance spectroscopy results, the conductivity of the Ce0.8Gd0.10Pr0.10O1.90 (σTotal,750 °C = 5.1 × 10−2 S/cm) composition was found to be higher than that of gadolinia-doped ceria (Ce0.8Gd0.20O1.90 (σTotal,750 °C = 3.4 × 10−2 S/cm). Due to higher ionic conductivity, it is thought that this composition can be a potential candidate to be used as an electrolyte material in ITSOFCs applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect