Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst
The electrochemical reduction of molecular oxygen is a fundamental process in Solid Oxide Fuel Cells and requires high efficiency cathode materials. Two La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<...
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MDPI AG
2023-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/4/1621 |
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| author | Chiara Aliotta Maria Costa Leonarda Francesca Liotta Valeria La Parola Giuliana Magnacca Francesca Deganello |
| author_facet | Chiara Aliotta Maria Costa Leonarda Francesca Liotta Valeria La Parola Giuliana Magnacca Francesca Deganello |
| author_sort | Chiara Aliotta |
| collection | DOAJ |
| description | The electrochemical reduction of molecular oxygen is a fundamental process in Solid Oxide Fuel Cells and requires high efficiency cathode materials. Two La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub>-based perovskite compounds were prepared by solution combustion synthesis, and characterized for their structural, microstructural, surface, redox and electrochemical properties as potential cathodes in comparison with Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> and La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> perovskites. Results highlighted that calcination at 900 °C led to a “bi-perovskite heterostructure”, where two different perovskite structures coexist, whereas at higher calcination temperatures a single-phase perovskite was formed. The results showed the effectiveness of the preparation procedures in co-doping the A-site of perovskites with barium and lanthanum as a strategy to optimize the cathode’s properties. The formation of nanometric heterostructure co-doped in the A-site evidenced an improvement in oxygen vacancies’ availability and in the redox properties, which promoted both processes: oxygen adsorption and oxygen ions drift, through the cathode material, to the electrolyte. A reduction in the total resistance was observed in the case of heterostructured material. |
| first_indexed | 2024-03-11T08:21:48Z |
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| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T08:21:48Z |
| publishDate | 2023-02-01 |
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| series | Molecules |
| spelling | doaj.art-1907843ce63a4cf99ecb0dcd3cfdd2fa2023-11-16T22:21:00ZengMDPI AGMolecules1420-30492023-02-01284162110.3390/molecules28041621Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction ElectrocatalystChiara Aliotta0Maria Costa1Leonarda Francesca Liotta2Valeria La Parola3Giuliana Magnacca4Francesca Deganello5Istituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, 90146 Palermo, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, 90146 Palermo, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, 90146 Palermo, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, 90146 Palermo, ItalyDipartimento di Chimica, Università degli Studi di Torino, 10125 Torino, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, 90146 Palermo, ItalyThe electrochemical reduction of molecular oxygen is a fundamental process in Solid Oxide Fuel Cells and requires high efficiency cathode materials. Two La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub>-based perovskite compounds were prepared by solution combustion synthesis, and characterized for their structural, microstructural, surface, redox and electrochemical properties as potential cathodes in comparison with Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> and La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> perovskites. Results highlighted that calcination at 900 °C led to a “bi-perovskite heterostructure”, where two different perovskite structures coexist, whereas at higher calcination temperatures a single-phase perovskite was formed. The results showed the effectiveness of the preparation procedures in co-doping the A-site of perovskites with barium and lanthanum as a strategy to optimize the cathode’s properties. The formation of nanometric heterostructure co-doped in the A-site evidenced an improvement in oxygen vacancies’ availability and in the redox properties, which promoted both processes: oxygen adsorption and oxygen ions drift, through the cathode material, to the electrolyte. A reduction in the total resistance was observed in the case of heterostructured material.https://www.mdpi.com/1420-3049/28/4/1621heterostructureoxygen vacanciesBa-doped-LSCFORRco-doping |
| spellingShingle | Chiara Aliotta Maria Costa Leonarda Francesca Liotta Valeria La Parola Giuliana Magnacca Francesca Deganello Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst Molecules heterostructure oxygen vacancies Ba-doped-LSCF ORR co-doping |
| title | Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst |
| title_full | Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst |
| title_fullStr | Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst |
| title_full_unstemmed | Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst |
| title_short | Peculiar Properties of the La<sub>0.25</sub>Ba<sub>0.25</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3−δ</sub> Perovskite as Oxygen Reduction Electrocatalyst |
| title_sort | peculiar properties of the la sub 0 25 sub ba sub 0 25 sub sr sub 0 5 sub co sub 0 8 sub fe sub 0 2 sub o sub 3 δ sub perovskite as oxygen reduction electrocatalyst |
| topic | heterostructure oxygen vacancies Ba-doped-LSCF ORR co-doping |
| url | https://www.mdpi.com/1420-3049/28/4/1621 |
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