Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films
Considerable attention has been directed to understanding the influence of heterointerfaces between Ruddlesden–Popper (RP) phases and ABO<sub>3</sub> perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxy...
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MDPI AG
2021-04-01
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| author | Gene Yang So-Yeun Kim Changhee Sohn Jong K. Keum Dongkyu Lee |
| author_facet | Gene Yang So-Yeun Kim Changhee Sohn Jong K. Keum Dongkyu Lee |
| author_sort | Gene Yang |
| collection | DOAJ |
| description | Considerable attention has been directed to understanding the influence of heterointerfaces between Ruddlesden–Popper (RP) phases and ABO<sub>3</sub> perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO<sub>3</sub> (LNO) on La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (<i>k</i><sub>chem</sub>) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the <i>k</i><sub>chem</sub> of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO. |
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| language | English |
| last_indexed | 2024-03-10T12:06:01Z |
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| spelling | doaj.art-b8b21a3ec7604d1a9b36a31adaf52f5a2023-11-21T16:38:13ZengMDPI AGApplied Sciences2076-34172021-04-01119377810.3390/app11093778Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin FilmsGene Yang0So-Yeun Kim1Changhee Sohn2Jong K. Keum3Dongkyu Lee4Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USADepartment of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, KoreaDepartment of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, KoreaCenter for Nanophase Materials Sciences, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, TN 37830, USADepartment of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USAConsiderable attention has been directed to understanding the influence of heterointerfaces between Ruddlesden–Popper (RP) phases and ABO<sub>3</sub> perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO<sub>3</sub> (LNO) on La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (<i>k</i><sub>chem</sub>) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the <i>k</i><sub>chem</sub> of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.https://www.mdpi.com/2076-3417/11/9/3778solid oxide fuel cellscathodesoxygen reductions reactionoxygen surface exchange kineticselectrical conductivity relaxationoxide thin films |
| spellingShingle | Gene Yang So-Yeun Kim Changhee Sohn Jong K. Keum Dongkyu Lee Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films Applied Sciences solid oxide fuel cells cathodes oxygen reductions reaction oxygen surface exchange kinetics electrical conductivity relaxation oxide thin films |
| title | Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films |
| title_full | Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films |
| title_fullStr | Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films |
| title_full_unstemmed | Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films |
| title_short | Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La<sub>1.85</sub>Sr<sub>0.15</sub>CuO<sub>4</sub> Thin Films |
| title_sort | influence of heterointerfaces on the kinetics of oxygen surface exchange on epitaxial la sub 1 85 sub sr sub 0 15 sub cuo sub 4 sub thin films |
| topic | solid oxide fuel cells cathodes oxygen reductions reaction oxygen surface exchange kinetics electrical conductivity relaxation oxide thin films |
| url | https://www.mdpi.com/2076-3417/11/9/3778 |
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