Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential
Abstract The instability of the surface chemistry in transition metal oxide perovskites is the main factor hindering the long-term durability of oxygen electrodes in solid oxide electrochemical cells. The instability of surface chemistry is mainly due to the segregation of A-site dopants from the la...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-11-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-42462-5 |
| _version_ | 1797630132133822464 |
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| author | Sanaz Koohfar Masoud Ghasemi Tyler Hafen Georgios Dimitrakopoulos Dongha Kim Jenna Pike Singaravelu Elangovan Enrique D. Gomez Bilge Yildiz |
| author_facet | Sanaz Koohfar Masoud Ghasemi Tyler Hafen Georgios Dimitrakopoulos Dongha Kim Jenna Pike Singaravelu Elangovan Enrique D. Gomez Bilge Yildiz |
| author_sort | Sanaz Koohfar |
| collection | DOAJ |
| description | Abstract The instability of the surface chemistry in transition metal oxide perovskites is the main factor hindering the long-term durability of oxygen electrodes in solid oxide electrochemical cells. The instability of surface chemistry is mainly due to the segregation of A-site dopants from the lattice to the surface. Here we report that cathodic potential can remarkably improve the stability in oxygen reduction reaction and electrochemical activity, by decomposing the near-surface region of the perovskite phase in a porous electrode made of La1-xSrxCo1-xFexO3 mixed with Sm0.2Ce0.8O1.9. Our approach combines X-ray photoelectron spectroscopy and secondary ion mass spectrometry for surface and sub-surface analysis. Formation of Ruddlesden-Popper phase is accompanied by suppression of the A-site dopant segregation, and exsolution of catalytically active Co particles onto the surface. These findings reveal the chemical and structural elements that maintain an active surface for oxygen reduction, and the cathodic potential is one way to generate these desirable chemistries. |
| first_indexed | 2024-03-11T11:03:42Z |
| format | Article |
| id | doaj.art-d0f7da009b934bc1be82abbabba64060 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-11T11:03:42Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-d0f7da009b934bc1be82abbabba640602023-11-12T12:22:07ZengNature PortfolioNature Communications2041-17232023-11-0114111110.1038/s41467-023-42462-5Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potentialSanaz Koohfar0Masoud Ghasemi1Tyler Hafen2Georgios Dimitrakopoulos3Dongha Kim4Jenna Pike5Singaravelu Elangovan6Enrique D. Gomez7Bilge Yildiz8Laboratory for Electrochemical Interfaces, Massachusetts Institute of TechnologyDepartment of Chemical Engineering, The Pennsylvania State UniversityOxEon Energy, LLCDepartment of Materials Science and Engineering, Massachusetts Institute of TechnologyDepartment of Materials Science and Engineering, Massachusetts Institute of TechnologyOxEon Energy, LLCOxEon Energy, LLCDepartment of Chemical Engineering, The Pennsylvania State UniversityLaboratory for Electrochemical Interfaces, Massachusetts Institute of TechnologyAbstract The instability of the surface chemistry in transition metal oxide perovskites is the main factor hindering the long-term durability of oxygen electrodes in solid oxide electrochemical cells. The instability of surface chemistry is mainly due to the segregation of A-site dopants from the lattice to the surface. Here we report that cathodic potential can remarkably improve the stability in oxygen reduction reaction and electrochemical activity, by decomposing the near-surface region of the perovskite phase in a porous electrode made of La1-xSrxCo1-xFexO3 mixed with Sm0.2Ce0.8O1.9. Our approach combines X-ray photoelectron spectroscopy and secondary ion mass spectrometry for surface and sub-surface analysis. Formation of Ruddlesden-Popper phase is accompanied by suppression of the A-site dopant segregation, and exsolution of catalytically active Co particles onto the surface. These findings reveal the chemical and structural elements that maintain an active surface for oxygen reduction, and the cathodic potential is one way to generate these desirable chemistries.https://doi.org/10.1038/s41467-023-42462-5 |
| spellingShingle | Sanaz Koohfar Masoud Ghasemi Tyler Hafen Georgios Dimitrakopoulos Dongha Kim Jenna Pike Singaravelu Elangovan Enrique D. Gomez Bilge Yildiz Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential Nature Communications |
| title | Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential |
| title_full | Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential |
| title_fullStr | Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential |
| title_full_unstemmed | Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential |
| title_short | Improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential |
| title_sort | improvement of oxygen reduction activity and stability on a perovskite oxide surface by electrochemical potential |
| url | https://doi.org/10.1038/s41467-023-42462-5 |
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