Temperature dependency of activity of nano-catalysts on La0.6Sr0.4Co0.2Fe0.8O3−δ cathode of solid oxide fuel cells
| Autor: | Abolghasem Ataie, Ali Soltanizade, Seyed Vahidreza Seyed-Vakili, Alireza Babaei |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Oxide chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences law.invention chemistry.chemical_compound law Materials Chemistry Cobalt oxide Spinel Atmospheric temperature range 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Dielectric spectroscopy chemistry Chemical engineering engineering 0210 nano-technology Cobalt |
| Zdroj: | Journal of Applied Electrochemistry. 49:1113-1122 |
| ISSN: | 1572-8838 0021-891X |
| DOI: | 10.1007/s10800-019-01355-6 |
| Popis: | In this study, Ag-ceria, Co-ceria, and Ba0.5Sr0.5Co0.8Fe0.2O3 nano-catalysts were introduced onto the structure of La0.6Sr0.4Co0.2Fe0.8O3−δ cathode of solid oxide fuel cells through infiltration technique and the electrochemical features of the infiltrated cathodes were examined by electrochemical impedance spectroscopy and analysis of distribution of relaxation times in the temperature range of 500–800 °C. The results revealed that Ba0.5Sr0.5Co0.8Fe0.2O3 exhibits considerable promoting behavior in the upper portion of the studied temperature range, while Co-ceria demonstrates significant catalytic activity for the oxygen reduction reaction at lower temperatures probably due to the active valence exchange of cobalt species in the spinel structure of cobalt oxide. Analysis of distribution of relaxation times revealed that low frequency arc of the impedance spectra is effectively hampered as a result of Ag-ceria and Co-ceria infiltration. Cathodic polarization of the infiltrated cells showed stable performance of the infiltrated electrodes over 50 h at 700 °C. |
| Databáze: | OpenAIRE |
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