Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC
The degradation mechanism of La0.6Sr0.4Co0.2Fe0.8O3 − δ (LSCF) electrode is investigated by examining its electrochemical behavior under equilibrium potential at elevated temperature and corresponding surface compositional changes. Diluted nitric acid etching treatment is conducted to confirm the co...
| Main Authors: | , , , , |
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| Outros autores: | |
| Formato: | Journal Article |
| Idioma: | English |
| Publicado: |
2019
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| Acceso en liña: | https://hdl.handle.net/10356/80976 http://hdl.handle.net/10220/48160 |
| _version_ | 1826109493898903552 |
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| author | Pan, Zehua Liu, Qinglin Zhang, Lan Zhang, Xiongwen Chan, Siew Hwa |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Pan, Zehua Liu, Qinglin Zhang, Lan Zhang, Xiongwen Chan, Siew Hwa |
| author_sort | Pan, Zehua |
| collection | NTU |
| description | The degradation mechanism of La0.6Sr0.4Co0.2Fe0.8O3 − δ (LSCF) electrode is investigated by examining its electrochemical behavior under equilibrium potential at elevated temperature and corresponding surface compositional changes. Diluted nitric acid etching treatment is conducted to confirm the correlation between the surface changes and the variation of electrochemical performance. It has been shown that the increase of polarization resistance of LSCF electrode has a linear dependence on the square root of time and arises from degradation of mass transfer process taking place at the gas-solid interface of electrode, such as oxygen adsorption/desorption and surface diffusion. Comparison of the behavior of the electrode before and after nitric acid treatment shows that the presence of surface inhibited species can account for the above observations. This inhibited species is confirmed by X-ray photoelectron spectroscopy to be a surface segregated Sr-based material, which supports the claim that surface Sr segregation is detrimental. A further lifespan study of LSCF electrode up to 158 h under 1 A/cm2 electrolysis current demonstrates that the current can improve and stabilize the performance, which could be ascribed to the removal of surface Sr species due to the incorporation of surface Sr back into the lattice of LSCF. |
| first_indexed | 2024-10-01T02:19:07Z |
| format | Journal Article |
| id | ntu-10356/80976 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:19:07Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/809762021-01-08T06:14:20Z Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC Pan, Zehua Liu, Qinglin Zhang, Lan Zhang, Xiongwen Chan, Siew Hwa School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Surface Segregation Electrochemical Performance DRNTU::Engineering::Mechanical engineering The degradation mechanism of La0.6Sr0.4Co0.2Fe0.8O3 − δ (LSCF) electrode is investigated by examining its electrochemical behavior under equilibrium potential at elevated temperature and corresponding surface compositional changes. Diluted nitric acid etching treatment is conducted to confirm the correlation between the surface changes and the variation of electrochemical performance. It has been shown that the increase of polarization resistance of LSCF electrode has a linear dependence on the square root of time and arises from degradation of mass transfer process taking place at the gas-solid interface of electrode, such as oxygen adsorption/desorption and surface diffusion. Comparison of the behavior of the electrode before and after nitric acid treatment shows that the presence of surface inhibited species can account for the above observations. This inhibited species is confirmed by X-ray photoelectron spectroscopy to be a surface segregated Sr-based material, which supports the claim that surface Sr segregation is detrimental. A further lifespan study of LSCF electrode up to 158 h under 1 A/cm2 electrolysis current demonstrates that the current can improve and stabilize the performance, which could be ascribed to the removal of surface Sr species due to the incorporation of surface Sr back into the lattice of LSCF. NRF (Natl Research Foundation, S’pore) Published version 2019-05-10T07:59:41Z 2019-12-06T14:18:43Z 2019-05-10T07:59:41Z 2019-12-06T14:18:43Z 2015 Journal Article Pan, Z., Liu, Q., Zhang, L., Zhang, X., & Chan, S. H. (2015). Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC. Journal of The Electrochemical Society, 162(12), F1316-F1323. doi:10.1149/2.0371512jes 0013-4651 https://hdl.handle.net/10356/80976 http://hdl.handle.net/10220/48160 10.1149/2.0371512jes en Journal of The Electrochemical Society © 2015 The Electrochemical Society. All rights reserved. This paper was published in Journal of The Electrochemical Society and is made available with permission of The Electrochemical Society. 8 p. application/pdf |
| spellingShingle | Surface Segregation Electrochemical Performance DRNTU::Engineering::Mechanical engineering Pan, Zehua Liu, Qinglin Zhang, Lan Zhang, Xiongwen Chan, Siew Hwa Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC |
| title | Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC |
| title_full | Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC |
| title_fullStr | Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC |
| title_full_unstemmed | Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC |
| title_short | Effect of Sr surface segregation of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 − δ electrode on its electrochemical performance in SOC |
| title_sort | effect of sr surface segregation of la 0 6 sr 0 4 co 0 2 fe 0 8 o 3 δ electrode on its electrochemical performance in soc |
| topic | Surface Segregation Electrochemical Performance DRNTU::Engineering::Mechanical engineering |
| url | https://hdl.handle.net/10356/80976 http://hdl.handle.net/10220/48160 |
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