Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability
Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ (BSCF) is a conventional anode material for solid oxide electrolysis cells (SOECs) to catalyze oxygen evolution reactions (OERs). However, the inferior chemical stability of BSCF results in severe surface segregation and performance degradation under high tem...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | JPhys Energy |
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| Online Access: | https://doi.org/10.1088/2515-7655/ada4dc |
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| author | Jingwei Li Zichao Wu Yuxiang Shen Yuefeng Song Houfu Lv Xiaomin Zhang Guoxiong Wang |
| author_facet | Jingwei Li Zichao Wu Yuxiang Shen Yuefeng Song Houfu Lv Xiaomin Zhang Guoxiong Wang |
| author_sort | Jingwei Li |
| collection | DOAJ |
| description | Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ (BSCF) is a conventional anode material for solid oxide electrolysis cells (SOECs) to catalyze oxygen evolution reactions (OERs). However, the inferior chemical stability of BSCF results in severe surface segregation and performance degradation under high temperatures. A critical challenge lies in alleviating surface segregation and preserving the high OER performance of BSCF anodes. Herein, lanthanides are introduced to substitute the Ba in BSCF, labeled as Ln _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ (LnSCF, Ln = La, Pr, Nd, Sm), to regulate its stability and performance. The introduction of La and Pr effectively enhances stability, suppresses surface segregation and maintains high OER activity. Continuous lattice oxygen loss and Co ion oxidation of LnSCF are demonstrated upon annealing in oxidizing atmosphere; thus, we propose that surface segregation is a self-regulation mechanism of perovskite lattice to tolerant oxidizing atmosphere. Perovskite oxides maintain structurally stable via decreasing A-site valence state and forming surface segregation. SOECs with La _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ anodes deliver an optimal current density of 1.69 A cm ^−2 at 1.6 V and stability for CO _2 electrolysis at 800 °C, shedding light on designing advanced catalysts for high-temperature OER. |
| format | Article |
| id | doaj-art-17202605edf44c5bb9c7e3d68f2f3cdb |
| institution | Kabale University |
| issn | 2515-7655 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | JPhys Energy |
| spelling | doaj-art-17202605edf44c5bb9c7e3d68f2f3cdb2025-01-15T12:22:28ZengIOP PublishingJPhys Energy2515-76552025-01-017202500210.1088/2515-7655/ada4dcSuppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durabilityJingwei Li0Zichao Wu1https://orcid.org/0000-0002-9784-7376Yuxiang Shen2https://orcid.org/0000-0002-6645-5046Yuefeng Song3Houfu Lv4Xiaomin Zhang5https://orcid.org/0000-0001-5155-6779Guoxiong Wang6https://orcid.org/0000-0001-6042-1171State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, People’s Republic of ChinaState Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, People’s Republic of China; University of Chinese Academy of Sciences , Beijing 100039, People’s Republic of ChinaState Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, People’s Republic of China; University of Chinese Academy of Sciences , Beijing 100039, People’s Republic of ChinaState Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, People’s Republic of ChinaSuzhou Laboratory , Suzhou 215000, People’s Republic of ChinaState Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, People’s Republic of ChinaState Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, People’s Republic of China; Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University , Shanghai 200438, People’s Republic of ChinaBa _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ (BSCF) is a conventional anode material for solid oxide electrolysis cells (SOECs) to catalyze oxygen evolution reactions (OERs). However, the inferior chemical stability of BSCF results in severe surface segregation and performance degradation under high temperatures. A critical challenge lies in alleviating surface segregation and preserving the high OER performance of BSCF anodes. Herein, lanthanides are introduced to substitute the Ba in BSCF, labeled as Ln _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ (LnSCF, Ln = La, Pr, Nd, Sm), to regulate its stability and performance. The introduction of La and Pr effectively enhances stability, suppresses surface segregation and maintains high OER activity. Continuous lattice oxygen loss and Co ion oxidation of LnSCF are demonstrated upon annealing in oxidizing atmosphere; thus, we propose that surface segregation is a self-regulation mechanism of perovskite lattice to tolerant oxidizing atmosphere. Perovskite oxides maintain structurally stable via decreasing A-site valence state and forming surface segregation. SOECs with La _0.5 Sr _0.5 Co _0.8 Fe _0.2 O _3− _δ anodes deliver an optimal current density of 1.69 A cm ^−2 at 1.6 V and stability for CO _2 electrolysis at 800 °C, shedding light on designing advanced catalysts for high-temperature OER.https://doi.org/10.1088/2515-7655/ada4dcsolid oxide electrolysis cellperovskite anodeCO2 electrolysisoxygen evolution reactionsurface segregation |
| spellingShingle | Jingwei Li Zichao Wu Yuxiang Shen Yuefeng Song Houfu Lv Xiaomin Zhang Guoxiong Wang Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability JPhys Energy solid oxide electrolysis cell perovskite anode CO2 electrolysis oxygen evolution reaction surface segregation |
| title | Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability |
| title_full | Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability |
| title_fullStr | Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability |
| title_full_unstemmed | Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability |
| title_short | Suppressing surface segregation by introducing lanthanides to enhance high-temperature oxygen evolution reaction activity and durability |
| title_sort | suppressing surface segregation by introducing lanthanides to enhance high temperature oxygen evolution reaction activity and durability |
| topic | solid oxide electrolysis cell perovskite anode CO2 electrolysis oxygen evolution reaction surface segregation |
| url | https://doi.org/10.1088/2515-7655/ada4dc |
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