Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C
SrNb0.1Co0.9O3-d (SNC) perovskite oxide has been prepared by high-energy ball milling followed by calcination at 1100 °C. According to oxygen temperature-programmed desorption and thermogravimetry analysis results, highly charged Nb5+ successfully stabilizes the perovskite structure to avoid order-d...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Elsevier Ltd
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/17806 |
| _version_ | 1848749563840561152 |
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| author | Zhou, W. Jin, W. Zhu, Z. Shao, Zongping |
| author_facet | Zhou, W. Jin, W. Zhu, Z. Shao, Zongping |
| author_sort | Zhou, W. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | SrNb0.1Co0.9O3-d (SNC) perovskite oxide has been prepared by high-energy ball milling followed by calcination at 1100 °C. According to oxygen temperature-programmed desorption and thermogravimetry analysis results, highly charged Nb5+ successfully stabilizes the perovskite structure to avoid order-disorder phase transition. The electrical conductivity reaches 550 S cm-1 at 300 °C in air and as high as 106 S cm-1 under P(O2) = 1 × 10-5 atm at 900 °C. The high electrical conductivity is beneficial in improving the charge-transfer process for the oxygen reduction reaction on the cathode. Based on the defect chemical analysis, the Nb-doping in SrCoO3-d perovskite facilitates the formation of Co2+, which increases oxygen nonstoichiometry and, subsequently, the mixed valence of [Co2+]/[Co3+] under lower oxygen partial pressure. A relatively low thermal expansion coefficient of 19.1 × 10-6 K-1 in air was achieved. All above properties show SNC to be a promising cathode material in the practical application of low-temperature solid oxide fuel cells. © 2009 Professor T. Nejat Veziroglu. |
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| format | Journal Article |
| id | curtin-20.500.11937-17806 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:22:56Z |
| publishDate | 2010 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
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| spelling | curtin-20.500.11937-178062023-08-02T06:39:07Z Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C Zhou, W. Jin, W. Zhu, Z. Shao, Zongping SrNb0.1Co0.9O3-d (SNC) perovskite oxide has been prepared by high-energy ball milling followed by calcination at 1100 °C. According to oxygen temperature-programmed desorption and thermogravimetry analysis results, highly charged Nb5+ successfully stabilizes the perovskite structure to avoid order-disorder phase transition. The electrical conductivity reaches 550 S cm-1 at 300 °C in air and as high as 106 S cm-1 under P(O2) = 1 × 10-5 atm at 900 °C. The high electrical conductivity is beneficial in improving the charge-transfer process for the oxygen reduction reaction on the cathode. Based on the defect chemical analysis, the Nb-doping in SrCoO3-d perovskite facilitates the formation of Co2+, which increases oxygen nonstoichiometry and, subsequently, the mixed valence of [Co2+]/[Co3+] under lower oxygen partial pressure. A relatively low thermal expansion coefficient of 19.1 × 10-6 K-1 in air was achieved. All above properties show SNC to be a promising cathode material in the practical application of low-temperature solid oxide fuel cells. © 2009 Professor T. Nejat Veziroglu. 2010 Journal Article http://hdl.handle.net/20.500.11937/17806 10.1016/j.ijhydene.2009.11.092 Elsevier Ltd restricted |
| spellingShingle | Zhou, W. Jin, W. Zhu, Z. Shao, Zongping Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C |
| title | Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C |
| title_full | Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C |
| title_fullStr | Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C |
| title_full_unstemmed | Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C |
| title_short | Structural, electrical and electrochemical characterizations of SrNb0.1Co0.9O3-d as a cathode of solid oxide fuel cells operating below 600 �C |
| title_sort | structural, electrical and electrochemical characterizations of srnb0.1co0.9o3-d as a cathode of solid oxide fuel cells operating below 600 �c |
| url | http://hdl.handle.net/20.500.11937/17806 |