Study of La4BaCu5-xMnxO13+δ materials as potential electrode for symmetrical-SOFC
| Autor: | Pascal Roussel, Camila Silva, Edouard Capoen, Leopoldo Suescun, Mario A. Macías, Caroline Pirovano, Gilles H. Gauthier, Silvia Durán, Anna Niemczyk, Nathaly Rangel |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen Reducing atmosphere Oxide Analytical chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Manganite 01 natural sciences Cathode 0104 chemical sciences Anode law.invention chemistry.chemical_compound chemistry law Electrode General Materials Science 0210 nano-technology |
| Zdroj: | Solid State Ionics. 341:115031 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2019.115031 |
| Popis: | La 4 BaCu 5-x Mn x O 13+δ materials have been synthesized by the sol-gel method in air and studied as possible electrode materials for symmetrical Solid Oxide Fuel Cells (S-SOFC). Within the series, La 4 BaMn 5 O 13+δ (LBMn) exhibits an excellent stability in reducing atmosphere and remarkable redox stability, although a structure transition from rhombohedral to cubic perovskite structure is found beyond 500 °C in air or wet diluted hydrogen. The thermal expansion coefficients (TEC), deduced from HT-XRD study during redox cycling, make the manganite compatible with classical SOFC electrolytes at low temperature; however, relatively high values of 15.8(5) and 18.1(2) K −1 are found in cathode and anode conditions for T > 500 °C. With high electrical conductivities of 178 and 33.3 S cm −1 , in air and hydrogen at 800 °C, we demonstrate that the La 0.8 Ba 0.2 MnO 3 ± δ manganite fulfils all the preliminary requirements of an electrode material for symmetrical SOFC. |
| Databáze: | OpenAIRE |
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