Evaluation of La 0.3 Ca 0.7 Fe 1−y Cr y O 3−δ (y = 0.1–0.3) cathodes for intermediate temperature solid oxide fuel cells
| Autor: | Qing Xu, Bok-Hee Kim, Duang-Ping Huang, Kai Zhao, Jing Xiao, Min Chen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Strontium
Materials science Mechanical Engineering Analytical chemistry Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Thermal expansion Cathode 0104 chemical sciences law.invention Chromium chemistry.chemical_compound chemistry Mechanics of Materials law Electrical resistivity and conductivity General Materials Science 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | Materials Research Bulletin. 90:104-110 |
| ISSN: | 0025-5408 |
| Popis: | Perovskite-type (ABO 3 ) complex oxides of La 0.3 Ca 0.7 Fe 1−y Cr y O 3−δ (y = 0.1–0.3) system were prepared via a glycine-nitrate process. In view of utilization as cathode for intermediate temperature solid oxide fuel cells, the structure, electrical conducting, thermal expansion and electrochemical properties of the oxides were investigated in comparison with their strontium counterparts (La 0.3 Sr 0.7 Fe 1−y Cr y O 3−δ , y = 0.1–0.3). Differences in the properties between the two systems were interpreted in relation with their structural characteristics. The results corroborate the effectiveness of modulating A-site dimension in modifying the overall properties of iron chromium-based perovskite-type cathode materials. The calcium compositions with y = 0.2 and y = 0.3, respectively, exhibit the optimal overall properties, superior to their strontium counterparts. The good overall properties of the two compositions, including suitable thermal expansion coefficients (11–12 × 10 −6 K −1 between 40 and 1000 °C), low polarization resistances (∼0.12 Ω cm 2 at 800 °C) and acceptable electrical conductivity (∼40 S cm −1 at 800 °C), demonstrate their potential in cathode utilization. |
| Databáze: | OpenAIRE |
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