Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ
Studies of oxygen surface exchange kinetics for La0.6Sr0.4Co0.8Fe0.2O3-δ oxide were performed using the technique of isotopic exchange of molecular oxygen with analysis of gas phase isotopic composition in a static circulation system at the temperatures of 600-800 °С in the oxygen pressure range of...
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| Format: | Article |
| Language: | English |
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Ural Federal University
2018-12-01
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| Series: | Chimica Techno Acta |
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| Online Access: | https://chimicatechnoacta.ru/article/view/3494 |
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| author | Natalia M. Porotnikova Ekaterina P. Antonova Anna V. Khodimchuk Eugene S. Tropin Andrey S. Farlenkov Maxim V. Ananyev |
| author_facet | Natalia M. Porotnikova Ekaterina P. Antonova Anna V. Khodimchuk Eugene S. Tropin Andrey S. Farlenkov Maxim V. Ananyev |
| author_sort | Natalia M. Porotnikova |
| collection | DOAJ |
| description | Studies of oxygen surface exchange kinetics for La0.6Sr0.4Co0.8Fe0.2O3-δ oxide were performed using the technique of isotopic exchange of molecular oxygen with analysis of gas phase isotopic composition in a static circulation system at the temperatures of 600-800 °С in the oxygen pressure range of 0.27-2.13 kPa. The values of interphase exchange rate and oxygen diffusion coefficient were determined. The effective activation energies for oxygen exchange and diffusion processes as well as the exponents in the dependence of these values versus oxygen pressure in the double logarithmic coordinates were calculated. The process of oxygen dissociative adsorption at the surface of La0.6Sr0.4Co0.8Fe0.2O3-δ oxide was found to be the rate-determining stage. |
| format | Article |
| id | doaj-art-08e1c53d05674ec1b2a11ee9bb95a5cf |
| institution | Kabale University |
| issn | 2411-1414 |
| language | English |
| publishDate | 2018-12-01 |
| publisher | Ural Federal University |
| record_format | Article |
| series | Chimica Techno Acta |
| spelling | doaj-art-08e1c53d05674ec1b2a11ee9bb95a5cf2025-08-20T03:55:33ZengUral Federal UniversityChimica Techno Acta2411-14142018-12-015419620410.15826/chimtech.2018.5.04.042918Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δNatalia M. Porotnikova0Ekaterina P. Antonova1Anna V. Khodimchuk2Eugene S. Tropin3Andrey S. Farlenkov4Maxim V. Ananyev5Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg; Ural Federal University, EkaterinburgInstitute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg; Ural Federal University, EkaterinburgInstitute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg; Ural Federal University, EkaterinburgInstitute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg; Ural Federal University, EkaterinburgInstitute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg; Ural Federal University, EkaterinburgInstitute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg; Ural Federal University, EkaterinburgStudies of oxygen surface exchange kinetics for La0.6Sr0.4Co0.8Fe0.2O3-δ oxide were performed using the technique of isotopic exchange of molecular oxygen with analysis of gas phase isotopic composition in a static circulation system at the temperatures of 600-800 °С in the oxygen pressure range of 0.27-2.13 kPa. The values of interphase exchange rate and oxygen diffusion coefficient were determined. The effective activation energies for oxygen exchange and diffusion processes as well as the exponents in the dependence of these values versus oxygen pressure in the double logarithmic coordinates were calculated. The process of oxygen dissociative adsorption at the surface of La0.6Sr0.4Co0.8Fe0.2O3-δ oxide was found to be the rate-determining stage.https://chimicatechnoacta.ru/article/view/3494oxygen isotope exchangeoxygen diffusionlanthanum- strontium cobaltite-ferriterate-determining stage |
| spellingShingle | Natalia M. Porotnikova Ekaterina P. Antonova Anna V. Khodimchuk Eugene S. Tropin Andrey S. Farlenkov Maxim V. Ananyev Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ Chimica Techno Acta oxygen isotope exchange oxygen diffusion lanthanum- strontium cobaltite-ferrite rate-determining stage |
| title | Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ |
| title_full | Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ |
| title_fullStr | Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ |
| title_full_unstemmed | Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ |
| title_short | Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ |
| title_sort | oxygen diffusion and surface exchange kinetics for the mixed conducting oxide la0 6sr0 4co0 8fe0 2o3 δ |
| topic | oxygen isotope exchange oxygen diffusion lanthanum- strontium cobaltite-ferrite rate-determining stage |
| url | https://chimicatechnoacta.ru/article/view/3494 |
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