A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells
© 2015 Hydrogen Energy Publications, LLC. A cobalt-free layered oxide-Sr4Fe6O13-d is synthesized and characterized for application as a cathode of intermediate temperature solid oxide fuel cells. High temperature powder x-ray diffraction, oxygen temperature programmed desorption and electrochemical...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/33737 |
| _version_ | 1848754030031929344 |
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| author | Jiang, S. Zhou, W. Sunarso, J. Ran, R. Shao, Zongping |
| author_facet | Jiang, S. Zhou, W. Sunarso, J. Ran, R. Shao, Zongping |
| author_sort | Jiang, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2015 Hydrogen Energy Publications, LLC. A cobalt-free layered oxide-Sr4Fe6O13-d is synthesized and characterized for application as a cathode of intermediate temperature solid oxide fuel cells. High temperature powder x-ray diffraction, oxygen temperature programmed desorption and electrochemical impedance spectroscopy are employed to evaluate the temperature-dependent crystal structure and oxygen reduction reaction (ORR) activity of Sr4Fe6O13-d. The oxide exhibits a single phase between room temperature and 1050 °C with low thermal expansion coefficient. The drawback of this oxide lies on its low ORR activity which is likely due to its layered structure which favors oxygen ionic transport two-dimensionally in the ac plane along the layered oxide layer. We show here that the original ORR activity can be improved by adjusting the phase compositions through an oxygen-deficient calcination process. An area specific resistance of 0.139 O cm2 at 700 °C is attained by calcining Sr4Fe6O13-d at 900 °C with ~66.2 wt% of perovskite phase in the composite material. |
| first_indexed | 2025-11-14T08:33:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-33737 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:33:55Z |
| publishDate | 2015 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-337372017-09-13T15:33:14Z A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells Jiang, S. Zhou, W. Sunarso, J. Ran, R. Shao, Zongping © 2015 Hydrogen Energy Publications, LLC. A cobalt-free layered oxide-Sr4Fe6O13-d is synthesized and characterized for application as a cathode of intermediate temperature solid oxide fuel cells. High temperature powder x-ray diffraction, oxygen temperature programmed desorption and electrochemical impedance spectroscopy are employed to evaluate the temperature-dependent crystal structure and oxygen reduction reaction (ORR) activity of Sr4Fe6O13-d. The oxide exhibits a single phase between room temperature and 1050 °C with low thermal expansion coefficient. The drawback of this oxide lies on its low ORR activity which is likely due to its layered structure which favors oxygen ionic transport two-dimensionally in the ac plane along the layered oxide layer. We show here that the original ORR activity can be improved by adjusting the phase compositions through an oxygen-deficient calcination process. An area specific resistance of 0.139 O cm2 at 700 °C is attained by calcining Sr4Fe6O13-d at 900 °C with ~66.2 wt% of perovskite phase in the composite material. 2015 Journal Article http://hdl.handle.net/20.500.11937/33737 10.1016/j.ijhydene.2015.09.097 restricted |
| spellingShingle | Jiang, S. Zhou, W. Sunarso, J. Ran, R. Shao, Zongping A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| title | A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| title_full | A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| title_fullStr | A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| title_full_unstemmed | A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| title_short | A cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| title_sort | cobalt-free layered oxide as an oxygen reduction catalyst for intermediate-temperature solid oxide fuel cells |
| url | http://hdl.handle.net/20.500.11937/33737 |