A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer
Composite cathodes based on La0.75Sr0.25Cr0.5Mn0.5O3-d (LSCM) are promising candidates for direct steam electrolysis while their insufficient electro-catalytic activity still restricts Faradic efficiency and electrode performance. In this work, scandium is doped into LSCM (LSCMS) to enhance the perf...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/3920 |
| _version_ | 1848744367201714176 |
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| author | Chen, S. Xie, K. Dong, Dehua Li, H. Qin, Q. Zhang, Y. Wu, Y. |
| author_facet | Chen, S. Xie, K. Dong, Dehua Li, H. Qin, Q. Zhang, Y. Wu, Y. |
| author_sort | Chen, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Composite cathodes based on La0.75Sr0.25Cr0.5Mn0.5O3-d (LSCM) are promising candidates for direct steam electrolysis while their insufficient electro-catalytic activity still restricts Faradic efficiency and electrode performance. In this work, scandium is doped into LSCM (LSCMS) to enhance the performance of the composite cathode. The combined characterization of XRD, TEM, TGA and XPS indicates successful partial replacement of Cr/Mn by scandium in the B site of chromate. The doping of scandium remarkably improves ionic conductivity while accordingly decreases the mixed conductivity. Electrochemical measurements demonstrate the decreased electrode polarizations of LSCMS cathodes. The Faradic efficiencies are accordingly enhanced by 20% and 50% compared with the electrolyzer with LSCM cathode for high temperature steam electrolysis by exposing cathode to 5%H2O/5%H2/Ar and 5%H2O/Ar, respectively. |
| first_indexed | 2025-11-14T06:00:20Z |
| format | Journal Article |
| id | curtin-20.500.11937-3920 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:00:20Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-39202017-09-13T14:32:14Z A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer Chen, S. Xie, K. Dong, Dehua Li, H. Qin, Q. Zhang, Y. Wu, Y. Composite cathodes based on La0.75Sr0.25Cr0.5Mn0.5O3-d (LSCM) are promising candidates for direct steam electrolysis while their insufficient electro-catalytic activity still restricts Faradic efficiency and electrode performance. In this work, scandium is doped into LSCM (LSCMS) to enhance the performance of the composite cathode. The combined characterization of XRD, TEM, TGA and XPS indicates successful partial replacement of Cr/Mn by scandium in the B site of chromate. The doping of scandium remarkably improves ionic conductivity while accordingly decreases the mixed conductivity. Electrochemical measurements demonstrate the decreased electrode polarizations of LSCMS cathodes. The Faradic efficiencies are accordingly enhanced by 20% and 50% compared with the electrolyzer with LSCM cathode for high temperature steam electrolysis by exposing cathode to 5%H2O/5%H2/Ar and 5%H2O/Ar, respectively. 2015 Journal Article http://hdl.handle.net/20.500.11937/3920 10.1016/j.jpowsour.2014.10.103 Elsevier restricted |
| spellingShingle | Chen, S. Xie, K. Dong, Dehua Li, H. Qin, Q. Zhang, Y. Wu, Y. A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| title | A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| title_full | A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| title_fullStr | A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| title_full_unstemmed | A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| title_short | A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| title_sort | composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer |
| url | http://hdl.handle.net/20.500.11937/3920 |