Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Lowering the operating temperature of solid oxide fuel cells (SOFCs) is highly desirable to reduce the cost and increase the lifetime, which relies upon the development of a cathode component with high oxygen reduction reaction (ORR) activity...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/65523 |
| _version_ | 1848761149522182144 |
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| author | Liu, B. Sunarso, J. Zhang, Y. Yang, G. Zhou, W. Shao, Zongping |
| author_facet | Liu, B. Sunarso, J. Zhang, Y. Yang, G. Zhou, W. Shao, Zongping |
| author_sort | Liu, B. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Lowering the operating temperature of solid oxide fuel cells (SOFCs) is highly desirable to reduce the cost and increase the lifetime, which relies upon the development of a cathode component with high oxygen reduction reaction (ORR) activity at a lower temperature. Herein, we report the characterization of high-performance BaSc x Co 1-x O 3-d (x=0, 0.125, 0.25, and 0.375) perovskite SOFC cathodes. Unlike BaCoO 3-d , which adopts 2H-hexagonal perovskite structure, the replacement of 25mol% of Co with Sc stabilizes the cubic structure, which also leads to the significant reduction in area specific resistances and their activation energies between 650 and 500°C (for BaSc 0.25 Co 0.75 O 3-d ) relative to the non-doped BaCoO 3-d . In this temperature range, BaSc 0.25 Co 0.75 O 3-d displayed a remarkably high ORR activity compared to Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-d (BSCF), the current cathode benchmark. We attribute such superior ORR performance to the higher oxygen non-stoichiometries of BaSc 0.25 Co 0.75 O 3-d relative to BSCF, which also translates to the higher oxygen bulk diffusion and surface exchange coefficients for the former compared to the latter. As a result, a single fuel cell based on an anode-supported 20µm thick samarium-doped ceria electrolyte and BaSc 0.25 Co 0.75 O 3-d cathode achieved a very high peak power density of 1723mWcm -2 at 650°C. We also demonstrated the possibility to increase the ORR activity of the BaSc 0.25 Co 0.75 O 3-d cathode by impregnation of a low amount of silver. |
| first_indexed | 2025-11-14T10:27:05Z |
| format | Journal Article |
| id | curtin-20.500.11937-65523 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:27:05Z |
| publishDate | 2018 |
| publisher | Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-655232023-08-02T06:39:11Z Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells Liu, B. Sunarso, J. Zhang, Y. Yang, G. Zhou, W. Shao, Zongping © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Lowering the operating temperature of solid oxide fuel cells (SOFCs) is highly desirable to reduce the cost and increase the lifetime, which relies upon the development of a cathode component with high oxygen reduction reaction (ORR) activity at a lower temperature. Herein, we report the characterization of high-performance BaSc x Co 1-x O 3-d (x=0, 0.125, 0.25, and 0.375) perovskite SOFC cathodes. Unlike BaCoO 3-d , which adopts 2H-hexagonal perovskite structure, the replacement of 25mol% of Co with Sc stabilizes the cubic structure, which also leads to the significant reduction in area specific resistances and their activation energies between 650 and 500°C (for BaSc 0.25 Co 0.75 O 3-d ) relative to the non-doped BaCoO 3-d . In this temperature range, BaSc 0.25 Co 0.75 O 3-d displayed a remarkably high ORR activity compared to Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-d (BSCF), the current cathode benchmark. We attribute such superior ORR performance to the higher oxygen non-stoichiometries of BaSc 0.25 Co 0.75 O 3-d relative to BSCF, which also translates to the higher oxygen bulk diffusion and surface exchange coefficients for the former compared to the latter. As a result, a single fuel cell based on an anode-supported 20µm thick samarium-doped ceria electrolyte and BaSc 0.25 Co 0.75 O 3-d cathode achieved a very high peak power density of 1723mWcm -2 at 650°C. We also demonstrated the possibility to increase the ORR activity of the BaSc 0.25 Co 0.75 O 3-d cathode by impregnation of a low amount of silver. 2018 Journal Article http://hdl.handle.net/20.500.11937/65523 10.1002/celc.201701309 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim restricted |
| spellingShingle | Liu, B. Sunarso, J. Zhang, Y. Yang, G. Zhou, W. Shao, Zongping Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
| title | Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
| title_full | Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
| title_fullStr | Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
| title_full_unstemmed | Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
| title_short | Highly Oxygen Non-Stoichiometric BaSc0.25Co0.75O3-das a High-Performance Cathode for Intermediate-Temperature Solid Oxide Fuel Cells |
| title_sort | highly oxygen non-stoichiometric basc0.25co0.75o3-das a high-performance cathode for intermediate-temperature solid oxide fuel cells |
| url | http://hdl.handle.net/20.500.11937/65523 |