Sm0.5Sr0.5CoO3−δ Surface Modification of La0.6Sr0.4Co0.2Fe0.8O3−δ -Ce0.9Gd0.12−δ Composite Oxygen Electrodes for Solid Oxide Electrochemical Cells
| Autor: | Tianrang Yang, Yvonne A. Chart, Alexander Furlong, Roberto Scipioni, Scott A. Barnett, Matthew Y. Lu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Composite number Oxide chemistry.chemical_element Condensed Matter Physics Oxygen Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrochemical cell chemistry.chemical_compound chemistry Chemical engineering Electrode Materials Chemistry Electrochemistry Surface modification Fuel cells |
| Zdroj: | Journal of The Electrochemical Society. 167:164504 |
| ISSN: | 1945-7111 0013-4651 |
| Popis: | La0.6Sr0.4Co0.2Fe0.8O3−δ -Ce0.9Gd0.1O2−δ (LSCF-GDC) composite oxygen electrodes have been widely used in intermediate temperature (0.5Sr0.5CoO3−δ (SSC) infiltrated LSCF-GDC electrodes. The LSCF-GDC polarization resistance increases by ∼5 times over ∼1000 h at 650 °C. In contrast, the SSC-infiltrated electrode shows similar initial polarization resistance but much more stable performance. The impedance modeling results show that the improved stability is associated with the low frequency oxygen dissociative adsorption/desorption process. The results suggest that this adsorption/desorption process slows due to increased Sr segregation on LSCF over time, and that SSC does not degrade significantly due to Sr surface segregation. |
| Databáze: | OpenAIRE |
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