Preparation and characterization of La1.75Y0.25Mo2-xAlxO9-δ as solid electrolyte for intermediate temperatures SOFC
Yttrium and aluminium co-substitutions on lanthanum molybdate ceramics with the nominal formula La1.75Y0.25Mo2-xAlxO9-δδ (LYMA, x = 0, 0.1, 0.2, 0.3 and 0.4) were synthesized by citric acid-nitrate combustion method and used for preparation of solid electrolyte for intermediate-temperature solid oxi...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Novi Sad
2023-03-01
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| Series: | Processing and Application of Ceramics |
| Subjects: | |
| Online Access: | https://www.doiserbia.nb.rs/img/doi/1820-6131/2023/1820-61312301031T.pdf |
| Summary: | Yttrium and aluminium co-substitutions on lanthanum molybdate ceramics with the nominal formula La1.75Y0.25Mo2-xAlxO9-δδ (LYMA, x = 0, 0.1, 0.2, 0.3 and 0.4) were synthesized by citric acid-nitrate combustion method and used for preparation of solid electrolyte for intermediate-temperature solid oxide fuel cells (ITSOFCs). Phase composition, structure, conductivity and electrical properties of LYMA have been investigated as a function of aluminium content by X-ray diffraction, scanning electron microscopy and electrochemical impedance spectroscopy, respectively. Experimental results showed that the substitution of La and Mo with appropriate amounts of Y and Al can effectively stabilize the β-form of La2Mo2O9 at room temperature and inhibit its phase transition to α-form. The LYMA synthesized by combustion method exhibited a better sinterability where relative density of the samples sintered at 950°C for 4 h was higher than 95%TD. The performance of the LYMA electrolyte was found to be related to Al-content. The La1.75Y0.25Mo1.8Al0.2O8.7 exhibited high oxide ion conductivity (σ= 42mS/cm at 800°C) and low electrical activation energy (Ea = 1.18 eV). These preliminary results indicate that the LYMA is a promising electrolyte for IT-SOFCs. |
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| ISSN: | 1820-6131 2406-1034 |