Electrochemical performance of nanostructured La0.6Sr0.4CoO3−δ and Sm0.5Sr0.5CoO3−δ cathodes for IT-SOFCs
| Autor: | R. O. Fuentes, J. Peña-Martínez, L. M. Acuña, Diego Germán Lamas, David Marrero-López, Pedro Núñez |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Diffusion Inorganic chemistry Energy Engineering and Power Technology Ionic bonding Electrochemistry Cathode Grain size law.invention Cobaltite chemistry.chemical_compound chemistry Chemical engineering Operating temperature law Specific surface area Electrical and Electronic Engineering Physical and Theoretical Chemistry |
| Zdroj: | Journal of Power Sources. 196:9276-9283 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2011.07.067 |
| Popis: | The electrochemical performance of nanostructured cathodes for IT-SOFCs based on perovskite-type mixed ionic/electronic conductors (MIECs) is investigated. Different compounds (La 0.6 Sr 0.4 CoO 3− δ and Sm 0.5 Sr 0.5 CoO 3− δ ) and synthesis methods (freeze-drying and citrate complexation) were evaluated. These materials exhibited excellent performance (area-specific resistance values in the range of 0.05–0.20 Ω cm 2 for an operating temperature of 700 °C), which improved with decreasing grain size. This performance can be attributed to the high specific surface area of these nanostructured cathodes, thus dramatically increasing the number of active sites for the oxygen reduction reaction. Under these conditions, the electrochemical properties are mainly controlled by oxide ion diffusion through the MIEC cathode, which becomes faster with decreasing grain size. |
| Databáze: | OpenAIRE |
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