Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures
In order to improve the electrical conductivity of the SrSc0.2Co0.8O3-d (SrScCo) electrode, a composite of 70 wt% SrSc0.2Co0.8O3-d and 30 wt% Sm0.5Sr0.5CoO3-d (SrScCo + SmSrCo) was prepared and investigated for electrochemical oxygen reduction at intermediate temperatures. The phase reaction between...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Elsevier Ltd
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/42009 |
| _version_ | 1848756300201066496 |
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| author | Guo, Y. Shi, H. Ran, R. Shao, Zongping |
| author_facet | Guo, Y. Shi, H. Ran, R. Shao, Zongping |
| author_sort | Guo, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In order to improve the electrical conductivity of the SrSc0.2Co0.8O3-d (SrScCo) electrode, a composite of 70 wt% SrSc0.2Co0.8O3-d and 30 wt% Sm0.5Sr0.5CoO3-d (SrScCo + SmSrCo) was prepared and investigated for electrochemical oxygen reduction at intermediate temperatures. The phase reaction between SrScCo and SmSrCo and its effect on the electrical conductivity, oxygen vacancy concentration and oxygen mobility were examined by XRD, 4-probe DC conductivity measurement, iodometry titration and O2-TPD experiment, respectively. The results showed that the composite reached a maximum conductivity around 123 S cm-1 at 600 °C, nearly five times that of SrScCo. AC impedance results showed that the electron charge-transfer process was greatly improved by forming the composite electrode, while the oxygen-ion charge-transfer process was somewhat deteriorated. By firing at 1000 °C for 2 h, a SOFC with the SrScCo + SmSrCo cathode and thin-film SDC electrolyte delivered peak power densities of 1100 and 366 mW cm-2 at 600 and 500 °C, respectively, which were only modestly lower than those of a similar cell with a pure SrScCo cathode. © 2009 Professor T. Nejat Veziroglu. |
| first_indexed | 2025-11-14T09:10:00Z |
| format | Journal Article |
| id | curtin-20.500.11937-42009 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:10:00Z |
| publishDate | 2009 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-420092017-09-13T14:20:15Z Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures Guo, Y. Shi, H. Ran, R. Shao, Zongping In order to improve the electrical conductivity of the SrSc0.2Co0.8O3-d (SrScCo) electrode, a composite of 70 wt% SrSc0.2Co0.8O3-d and 30 wt% Sm0.5Sr0.5CoO3-d (SrScCo + SmSrCo) was prepared and investigated for electrochemical oxygen reduction at intermediate temperatures. The phase reaction between SrScCo and SmSrCo and its effect on the electrical conductivity, oxygen vacancy concentration and oxygen mobility were examined by XRD, 4-probe DC conductivity measurement, iodometry titration and O2-TPD experiment, respectively. The results showed that the composite reached a maximum conductivity around 123 S cm-1 at 600 °C, nearly five times that of SrScCo. AC impedance results showed that the electron charge-transfer process was greatly improved by forming the composite electrode, while the oxygen-ion charge-transfer process was somewhat deteriorated. By firing at 1000 °C for 2 h, a SOFC with the SrScCo + SmSrCo cathode and thin-film SDC electrolyte delivered peak power densities of 1100 and 366 mW cm-2 at 600 and 500 °C, respectively, which were only modestly lower than those of a similar cell with a pure SrScCo cathode. © 2009 Professor T. Nejat Veziroglu. 2009 Journal Article http://hdl.handle.net/20.500.11937/42009 10.1016/j.ijhydene.2009.09.053 Elsevier Ltd restricted |
| spellingShingle | Guo, Y. Shi, H. Ran, R. Shao, Zongping Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| title | Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| title_full | Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| title_fullStr | Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| title_full_unstemmed | Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| title_short | Performance of SrSc0.2Co0.8O3-d + Sm0.5Sr0.5CoO3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| title_sort | performance of srsc0.2co0.8o3-d + sm0.5sr0.5coo3-d mixed-conducting composite electrodes for oxygen reduction at intermediate temperatures |
| url | http://hdl.handle.net/20.500.11937/42009 |