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Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films
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| Zeitschriftentitel: | Advanced Science |
|---|---|
| Personen und Körperschaften: | , , , , , , , , , , , , |
| In: | Advanced Science, 6, 2019, 6 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Wiley
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| Schlagwörter: |
| author_facet |
Liu, Xi Zhang, Lei Zheng, Yun Guo, Zheng Zhu, Yunmin Chen, Huijun Li, Fei Liu, Peipei Yu, Bo Wang, Xinwei Liu, Jiang Chen, Yan Liu, Meilin Liu, Xi Zhang, Lei Zheng, Yun Guo, Zheng Zhu, Yunmin Chen, Huijun Li, Fei Liu, Peipei Yu, Bo Wang, Xinwei Liu, Jiang Chen, Yan Liu, Meilin |
|---|---|
| author |
Liu, Xi Zhang, Lei Zheng, Yun Guo, Zheng Zhu, Yunmin Chen, Huijun Li, Fei Liu, Peipei Yu, Bo Wang, Xinwei Liu, Jiang Chen, Yan Liu, Meilin |
| spellingShingle |
Liu, Xi Zhang, Lei Zheng, Yun Guo, Zheng Zhu, Yunmin Chen, Huijun Li, Fei Liu, Peipei Yu, Bo Wang, Xinwei Liu, Jiang Chen, Yan Liu, Meilin Advanced Science Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films General Physics and Astronomy General Engineering Biochemistry, Genetics and Molecular Biology (miscellaneous) General Materials Science General Chemical Engineering Medicine (miscellaneous) |
| author_sort |
liu, xi |
| spelling |
Liu, Xi Zhang, Lei Zheng, Yun Guo, Zheng Zhu, Yunmin Chen, Huijun Li, Fei Liu, Peipei Yu, Bo Wang, Xinwei Liu, Jiang Chen, Yan Liu, Meilin 2198-3844 2198-3844 Wiley General Physics and Astronomy General Engineering Biochemistry, Genetics and Molecular Biology (miscellaneous) General Materials Science General Chemical Engineering Medicine (miscellaneous) http://dx.doi.org/10.1002/advs.201801898 <jats:title>Abstract</jats:title><jats:p>Developing cost effective electrocatalysts with high oxygen evolution reaction (OER) activity is essential for large‐scale application of many electrochemical energy systems. Although the impacts of either lattice strain or oxygen defects on the OER performance of oxide catalysts have been extensively investigated, the effects of both factors are normally treated separately. In this work, the coupled effects of both strain and oxygen deficiency on the electrocatalytic activity of La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>CoO<jats:sub>3−δ</jats:sub> (LSC) thin films grown on single crystal substrates (LaAlO3 (LAO) and SrTiO3 (STO)) are investigated. Electrochemical tests show that the OER activities of LSC films are higher under compression than under tension, and are diminished as oxygen vacancies are introduced by vacuum annealing. Both experimental and computational results indicate that the LSC films under tension (e.g., LSC/STO) have larger oxygen deficiency than the films under compression (e.g., LSC/LAO), which attribute to smaller oxygen vacancy formation energy. Such strain‐induced excessive oxygen vacancies in the LSC/STO increases the <jats:italic>e<jats:sub>g</jats:sub></jats:italic> state occupancy and enlarges the energy gap between the O 2p and Co 3d band, resulting in lower OER activity. Understanding the critical role of strain–defect coupling is important for achieving the rational design of highly active and durable catalysts for energy devices.</jats:p> Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films Advanced Science |
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| title |
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_unstemmed |
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_full |
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_fullStr |
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_full_unstemmed |
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_short |
Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_sort |
uncovering the effect of lattice strain and oxygen deficiency on electrocatalytic activity of perovskite cobaltite thin films |
| topic |
General Physics and Astronomy General Engineering Biochemistry, Genetics and Molecular Biology (miscellaneous) General Materials Science General Chemical Engineering Medicine (miscellaneous) |
| url |
http://dx.doi.org/10.1002/advs.201801898 |
| publishDate |
2019 |
| physical |
|
| description |
<jats:title>Abstract</jats:title><jats:p>Developing cost effective electrocatalysts with high oxygen evolution reaction (OER) activity is essential for large‐scale application of many electrochemical energy systems. Although the impacts of either lattice strain or oxygen defects on the OER performance of oxide catalysts have been extensively investigated, the effects of both factors are normally treated separately. In this work, the coupled effects of both strain and oxygen deficiency on the electrocatalytic activity of La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>CoO<jats:sub>3−δ</jats:sub> (LSC) thin films grown on single crystal substrates (LaAlO3 (LAO) and SrTiO3 (STO)) are investigated. Electrochemical tests show that the OER activities of LSC films are higher under compression than under tension, and are diminished as oxygen vacancies are introduced by vacuum annealing. Both experimental and computational results indicate that the LSC films under tension (e.g., LSC/STO) have larger oxygen deficiency than the films under compression (e.g., LSC/LAO), which attribute to smaller oxygen vacancy formation energy. Such strain‐induced excessive oxygen vacancies in the LSC/STO increases the <jats:italic>e<jats:sub>g</jats:sub></jats:italic> state occupancy and enlarges the energy gap between the O 2p and Co 3d band, resulting in lower OER activity. Understanding the critical role of strain–defect coupling is important for achieving the rational design of highly active and durable catalysts for energy devices.</jats:p> |
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| author | Liu, Xi, Zhang, Lei, Zheng, Yun, Guo, Zheng, Zhu, Yunmin, Chen, Huijun, Li, Fei, Liu, Peipei, Yu, Bo, Wang, Xinwei, Liu, Jiang, Chen, Yan, Liu, Meilin |
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| description | <jats:title>Abstract</jats:title><jats:p>Developing cost effective electrocatalysts with high oxygen evolution reaction (OER) activity is essential for large‐scale application of many electrochemical energy systems. Although the impacts of either lattice strain or oxygen defects on the OER performance of oxide catalysts have been extensively investigated, the effects of both factors are normally treated separately. In this work, the coupled effects of both strain and oxygen deficiency on the electrocatalytic activity of La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>CoO<jats:sub>3−δ</jats:sub> (LSC) thin films grown on single crystal substrates (LaAlO3 (LAO) and SrTiO3 (STO)) are investigated. Electrochemical tests show that the OER activities of LSC films are higher under compression than under tension, and are diminished as oxygen vacancies are introduced by vacuum annealing. Both experimental and computational results indicate that the LSC films under tension (e.g., LSC/STO) have larger oxygen deficiency than the films under compression (e.g., LSC/LAO), which attribute to smaller oxygen vacancy formation energy. Such strain‐induced excessive oxygen vacancies in the LSC/STO increases the <jats:italic>e<jats:sub>g</jats:sub></jats:italic> state occupancy and enlarges the energy gap between the O 2p and Co 3d band, resulting in lower OER activity. Understanding the critical role of strain–defect coupling is important for achieving the rational design of highly active and durable catalysts for energy devices.</jats:p> |
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| spelling | Liu, Xi Zhang, Lei Zheng, Yun Guo, Zheng Zhu, Yunmin Chen, Huijun Li, Fei Liu, Peipei Yu, Bo Wang, Xinwei Liu, Jiang Chen, Yan Liu, Meilin 2198-3844 2198-3844 Wiley General Physics and Astronomy General Engineering Biochemistry, Genetics and Molecular Biology (miscellaneous) General Materials Science General Chemical Engineering Medicine (miscellaneous) http://dx.doi.org/10.1002/advs.201801898 <jats:title>Abstract</jats:title><jats:p>Developing cost effective electrocatalysts with high oxygen evolution reaction (OER) activity is essential for large‐scale application of many electrochemical energy systems. Although the impacts of either lattice strain or oxygen defects on the OER performance of oxide catalysts have been extensively investigated, the effects of both factors are normally treated separately. In this work, the coupled effects of both strain and oxygen deficiency on the electrocatalytic activity of La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>CoO<jats:sub>3−δ</jats:sub> (LSC) thin films grown on single crystal substrates (LaAlO3 (LAO) and SrTiO3 (STO)) are investigated. Electrochemical tests show that the OER activities of LSC films are higher under compression than under tension, and are diminished as oxygen vacancies are introduced by vacuum annealing. Both experimental and computational results indicate that the LSC films under tension (e.g., LSC/STO) have larger oxygen deficiency than the films under compression (e.g., LSC/LAO), which attribute to smaller oxygen vacancy formation energy. Such strain‐induced excessive oxygen vacancies in the LSC/STO increases the <jats:italic>e<jats:sub>g</jats:sub></jats:italic> state occupancy and enlarges the energy gap between the O 2p and Co 3d band, resulting in lower OER activity. Understanding the critical role of strain–defect coupling is important for achieving the rational design of highly active and durable catalysts for energy devices.</jats:p> Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films Advanced Science |
| spellingShingle | Liu, Xi, Zhang, Lei, Zheng, Yun, Guo, Zheng, Zhu, Yunmin, Chen, Huijun, Li, Fei, Liu, Peipei, Yu, Bo, Wang, Xinwei, Liu, Jiang, Chen, Yan, Liu, Meilin, Advanced Science, Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films, General Physics and Astronomy, General Engineering, Biochemistry, Genetics and Molecular Biology (miscellaneous), General Materials Science, General Chemical Engineering, Medicine (miscellaneous) |
| title | Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_full | Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_fullStr | Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_full_unstemmed | Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_short | Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| title_sort | uncovering the effect of lattice strain and oxygen deficiency on electrocatalytic activity of perovskite cobaltite thin films |
| title_unstemmed | Uncovering the Effect of Lattice Strain and Oxygen Deficiency on Electrocatalytic Activity of Perovskite Cobaltite Thin Films |
| topic | General Physics and Astronomy, General Engineering, Biochemistry, Genetics and Molecular Biology (miscellaneous), General Materials Science, General Chemical Engineering, Medicine (miscellaneous) |
| url | http://dx.doi.org/10.1002/advs.201801898 |