Surface chemistry and porosity engineering through etching reveal ultrafast oxygen reduction kinetics below 400 °C in B-site exposed (La,Sr)(Co,Fe)O3 thin-films
cam.depositDate | 2022-01-10 | |
cam.issuedOnline | 2022-01-22 | |
cam.oa.sap | oa_rrs_na | |
cam.orpheus.success | Tue Feb 01 19:02:41 GMT 2022 - Embargo updated | |
dc.contributor.author | Acosta, M | |
dc.contributor.author | Baiutti, F | |
dc.contributor.author | Wang, X | |
dc.contributor.author | Cavallaro, A | |
dc.contributor.author | Wu, J | |
dc.contributor.author | Li, W | |
dc.contributor.author | Parker, SC | |
dc.contributor.author | Aguadero, A | |
dc.contributor.author | Wang, H | |
dc.contributor.author | Tarancón, A | |
dc.contributor.author | MacManus-Driscoll, JL | |
dc.contributor.orcid | Acosta, M [0000-0001-9504-883X] | |
dc.contributor.orcid | Baiutti, F [0000-0001-9664-2486] | |
dc.contributor.orcid | Wu, J [0000-0003-3938-8834] | |
dc.contributor.orcid | Tarancón, A [0000-0002-1933-2406] | |
dc.date.accessioned | 2022-01-12T00:31:03Z | |
dc.date.available | 2022-01-12T00:31:03Z | |
dc.date.issued | 2022-03 | |
dc.date.updated | 2022-01-10T18:22:43Z | |
dc.description.abstract | Oxides are critical materials for energy devices like solid oxide cells, catalysts, and membranes. Their performance is often limited by their catalytic activity at reduced temperatures. In this work, a simple etching process with acetic acid at room temperature was used to investigate how oxygen exchange is influenced by surface chemistry and mesoporous structuring in single-crystalline epitaxial (La0.60Sr0.40)0.95(Co0.20Fe0.80)O3. Using low energy ion scattering and electrical measurements, it is shown that increasing the B-site transition metal cation surface exposure (most notably with Fe) leads to strongly reduced activation energy from Ea≈1 eV to Ea ≈0.4 eV for oxygen exchange and an order of magnitude increased oxygen exchange kinetics below 400 °C. Increasing the active area by ~200% via mesoporous structuring leads to increased oxygen reduction rates by the same percentage. Density functional calculations indicate that a B-site exposed surface with high oxygen vacancy concentration can explain the experimental results. The work opens a pathway to tune surfaces and optimize oxygen exchange for energy devices. | |
dc.identifier.doi | 10.17863/CAM.80084 | |
dc.identifier.issn | 0378-7753 | |
dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/332639 | |
dc.language.iso | eng | |
dc.publisher | Elsevier BV | |
dc.publisher.department | Department of Materials Science And Metallurgy | |
dc.publisher.url | http://dx.doi.org/10.1016/j.jpowsour.2022.230983 | |
dc.rights | All Rights Reserved | |
dc.rights.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
dc.subject | 40 Engineering | |
dc.subject | 4016 Materials Engineering | |
dc.subject | 34 Chemical Sciences | |
dc.subject | 3406 Physical Chemistry | |
dc.subject | 7 Affordable and Clean Energy | |
dc.title | Surface chemistry and porosity engineering through etching reveal ultrafast oxygen reduction kinetics below 400 °C in B-site exposed (La,Sr)(Co,Fe)O3 thin-films | |
dc.type | Article | |
dcterms.dateAccepted | 2022-01-06 | |
prism.publicationName | Journal of Power Sources | |
pubs.funder-project-id | Engineering and Physical Sciences Research Council (EP/P007767/1) | |
pubs.funder-project-id | Royal Academy of Engineering (RAEng) (CiET1819\24) | |
pubs.funder-project-id | European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (101017709) | |
pubs.funder-project-id | EPSRC (EP/T012218/1) | |
pubs.funder-project-id | European Commission Horizon 2020 (H2020) ERC (882929) | |
pubs.licence-display-name | Apollo Repository Deposit Licence Agreement | |
pubs.licence-identifier | apollo-deposit-licence-2-1 | |
rioxxterms.type | Journal Article/Review | |
rioxxterms.version | AM | |
rioxxterms.versionofrecord | 10.1016/j.jpowsour.2022.230983 |
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