Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution
Oxygen reduction and evolution reactions (ORR and OER, respectively) of perovskite-type La0.8Sr0.2CoO3 were characterized using two-dimensional model electrodes with different reaction planes (001), (110), and (111). Synthesized by pulsed laser deposition, these thin (30 nm) and flat (roughness <...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2022-10-01
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| Series: | Electrochemistry |
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| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/90/10/90_22-00079/_html/-char/en |
| _version_ | 1797965977183322112 |
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| author | Akira MATSUZAKI Masaaki HIRAYAMA Shouya OHGUCHI Mamoru KOMO Atsunori IKEZAWA Kota SUZUKI Kazuhisa TAMURA Hajime ARAI Ryoji KANNO |
| author_facet | Akira MATSUZAKI Masaaki HIRAYAMA Shouya OHGUCHI Mamoru KOMO Atsunori IKEZAWA Kota SUZUKI Kazuhisa TAMURA Hajime ARAI Ryoji KANNO |
| author_sort | Akira MATSUZAKI |
| collection | DOAJ |
| description | Oxygen reduction and evolution reactions (ORR and OER, respectively) of perovskite-type La0.8Sr0.2CoO3 were characterized using two-dimensional model electrodes with different reaction planes (001), (110), and (111). Synthesized by pulsed laser deposition, these thin (30 nm) and flat (roughness < 1 nm) electrodes can reveal the reaction plane dependence of the ORR activity. From steady-state polarization measurements in KOH (aq.), the ORR activity was the highest on the (001) film during the first ORR/OER cycle, and it decreased significantly during the second cycle. In-situ synchrotron X-ray diffraction clarified crystal structure changes in the bulk and surface regions of La0.8Sr0.2CoO3, and these changes are associated with forming oxygen defects during the initial electrochemical process. Furthermore, the La0.8Sr0.2CoO3 surface partially decomposed upon reacting with the aqueous solution, as clarified by hard X-ray photoemission spectroscopy. Therefore, the interfacial structures formed in the electrochemical reaction field is important for enhancing ORR and OER activities. |
| first_indexed | 2024-04-11T02:08:28Z |
| format | Article |
| id | doaj.art-83a2ca7a27f345a684a68a77597a94c1 |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-04-11T02:08:28Z |
| publishDate | 2022-10-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-83a2ca7a27f345a684a68a77597a94c12023-01-03T02:41:29ZengThe Electrochemical Society of JapanElectrochemistry2186-24512022-10-01901010700110700110.5796/electrochemistry.22-00079electrochemistryOxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline SolutionAkira MATSUZAKI0Masaaki HIRAYAMA1https://orcid.org/0000-0003-4804-4208Shouya OHGUCHI2Mamoru KOMO3Atsunori IKEZAWA4Kota SUZUKI5Kazuhisa TAMURA6Hajime ARAI7Ryoji KANNO8Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyAll-Solid-State Battery Center, Institute of Innovative Research, Tokyo Institute of TechnologyJapan Atomic Energy Agency, Synchrotron Radiation Research Center, Kansai Research EstablishmentDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyAll-Solid-State Battery Center, Institute of Innovative Research, Tokyo Institute of TechnologyOxygen reduction and evolution reactions (ORR and OER, respectively) of perovskite-type La0.8Sr0.2CoO3 were characterized using two-dimensional model electrodes with different reaction planes (001), (110), and (111). Synthesized by pulsed laser deposition, these thin (30 nm) and flat (roughness < 1 nm) electrodes can reveal the reaction plane dependence of the ORR activity. From steady-state polarization measurements in KOH (aq.), the ORR activity was the highest on the (001) film during the first ORR/OER cycle, and it decreased significantly during the second cycle. In-situ synchrotron X-ray diffraction clarified crystal structure changes in the bulk and surface regions of La0.8Sr0.2CoO3, and these changes are associated with forming oxygen defects during the initial electrochemical process. Furthermore, the La0.8Sr0.2CoO3 surface partially decomposed upon reacting with the aqueous solution, as clarified by hard X-ray photoemission spectroscopy. Therefore, the interfacial structures formed in the electrochemical reaction field is important for enhancing ORR and OER activities.https://www.jstage.jst.go.jp/article/electrochemistry/90/10/90_22-00079/_html/-char/enmetal air batteriesair electrodesepitaxial filmin situ synchrotron x-ray diffraction |
| spellingShingle | Akira MATSUZAKI Masaaki HIRAYAMA Shouya OHGUCHI Mamoru KOMO Atsunori IKEZAWA Kota SUZUKI Kazuhisa TAMURA Hajime ARAI Ryoji KANNO Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution Electrochemistry metal air batteries air electrodes epitaxial film in situ synchrotron x-ray diffraction |
| title | Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution |
| title_full | Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution |
| title_fullStr | Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution |
| title_full_unstemmed | Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution |
| title_short | Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution |
| title_sort | oxygen reduction activity and interfacial structures of la0 8sr0 2coo3 at initial electrochemical process in an alkaline solution |
| topic | metal air batteries air electrodes epitaxial film in situ synchrotron x-ray diffraction |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/90/10/90_22-00079/_html/-char/en |
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