Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media
Perovskite oxide is an attractive low-cost alternative catalyst for oxygen evolution reaction (OER) relative to the precious metal oxide-based electrocatalysts (IrO 2 and RuO 2 ). In this work, a series of Sr-doped La-based perovskite oxide catalysts with compositions of La 1-x Sr x FeO 3-δ (x = 0,...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
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American Chemical Society
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/67886 |
| _version_ | 1848761685226029056 |
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| author | She, S. Yu, J. Tang, W. Zhu, Y. Chen, Y. Sunarso, J. Zhou, W. Shao, Zongping |
| author_facet | She, S. Yu, J. Tang, W. Zhu, Y. Chen, Y. Sunarso, J. Zhou, W. Shao, Zongping |
| author_sort | She, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Perovskite oxide is an attractive low-cost alternative catalyst for oxygen evolution reaction (OER) relative to the precious metal oxide-based electrocatalysts (IrO 2 and RuO 2 ). In this work, a series of Sr-doped La-based perovskite oxide catalysts with compositions of La 1-x Sr x FeO 3-δ (x = 0, 0.2, 0.5, 0.8, and 1) are synthesized and characterized. The OER-specific activities in alkaline solution increase in the order of LaFeO 3-δ (LF), La 0.8 Sr 0.2 FeO 3-δ (LSF-0.2), La 0.5 Sr 0.5 FeO 3-δ (LSF-0.5), SrFeO 3-δ (SF), and La 0.2 Sr 0.8 FeO 3-δ (LSF-0.8). We establish a direct correlation between the enhancement in the specific activity and the amount of surface oxygen vacancies as well as the surface Fe oxidation states. The improved specific activity for LSF-0.8 is clearly linked to the optimum amount of surface oxygen vacancies and surface Fe oxidation states. We also find that the OER performance stability is a function of the crystal structure and the deviation in the surface La and/or Sr composition(s) from their bulk stoichiometric compositions. The cubic structure and lower deviation, as is the case for LSF-0.8, led to a higher OER performance stability. These surface performance relations provide a promising guideline for constructing efficient water oxidation. |
| first_indexed | 2025-11-14T10:35:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-67886 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:35:36Z |
| publishDate | 2018 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-678862018-08-24T00:42:56Z Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media She, S. Yu, J. Tang, W. Zhu, Y. Chen, Y. Sunarso, J. Zhou, W. Shao, Zongping Perovskite oxide is an attractive low-cost alternative catalyst for oxygen evolution reaction (OER) relative to the precious metal oxide-based electrocatalysts (IrO 2 and RuO 2 ). In this work, a series of Sr-doped La-based perovskite oxide catalysts with compositions of La 1-x Sr x FeO 3-δ (x = 0, 0.2, 0.5, 0.8, and 1) are synthesized and characterized. The OER-specific activities in alkaline solution increase in the order of LaFeO 3-δ (LF), La 0.8 Sr 0.2 FeO 3-δ (LSF-0.2), La 0.5 Sr 0.5 FeO 3-δ (LSF-0.5), SrFeO 3-δ (SF), and La 0.2 Sr 0.8 FeO 3-δ (LSF-0.8). We establish a direct correlation between the enhancement in the specific activity and the amount of surface oxygen vacancies as well as the surface Fe oxidation states. The improved specific activity for LSF-0.8 is clearly linked to the optimum amount of surface oxygen vacancies and surface Fe oxidation states. We also find that the OER performance stability is a function of the crystal structure and the deviation in the surface La and/or Sr composition(s) from their bulk stoichiometric compositions. The cubic structure and lower deviation, as is the case for LSF-0.8, led to a higher OER performance stability. These surface performance relations provide a promising guideline for constructing efficient water oxidation. 2018 Journal Article http://hdl.handle.net/20.500.11937/67886 10.1021/acsami.8b00682 American Chemical Society restricted |
| spellingShingle | She, S. Yu, J. Tang, W. Zhu, Y. Chen, Y. Sunarso, J. Zhou, W. Shao, Zongping Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media |
| title | Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media |
| title_full | Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media |
| title_fullStr | Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media |
| title_full_unstemmed | Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media |
| title_short | Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media |
| title_sort | systematic study of oxygen evolution activity and stability on la1–xsrxfeo3−δ perovskite electrocatalysts in alkaline media |
| url | http://hdl.handle.net/20.500.11937/67886 |