Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes
SmxSr1 − xCoO3 − δ (SSCx) materials are promising cathodes for IT-SOFCs. The influence of Sm content in SSCx (0.2 ≤ x ≤ 0.8) oxides on their oxygen nonstoichiometry, oxygen desorption, thermal expansion behavior, electrical conductivity and electrochemical activity for oxygen reduction is systematic...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
2011
|
| Online Access: | http://hdl.handle.net/20.500.11937/21316 |
| _version_ | 1848750556219179008 |
|---|---|
| author | Guo, Y. Chen, D. Shi, H. Ran, R. Shao, Zongping |
| author_facet | Guo, Y. Chen, D. Shi, H. Ran, R. Shao, Zongping |
| author_sort | Guo, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | SmxSr1 − xCoO3 − δ (SSCx) materials are promising cathodes for IT-SOFCs. The influence of Sm content in SSCx (0.2 ≤ x ≤ 0.8) oxides on their oxygen nonstoichiometry, oxygen desorption, thermal expansion behavior, electrical conductivity and electrochemical activity for oxygen reduction is systematically studied by iodometric titration, oxygen-temperature programmed desorption (O2-TPD), dilatometer, four-probe DC conductivity, electrochemical impedance spectroscopy (EIS) and three-electrode polarization test, respectively. Iodometric titration experiments demonstrate that the electrical charge neutrality compensation in SSCx proceeds preferably through the oxidation of cobalt ion for high Sm3+ contents (x ≥ 0.6). However, it proceeds mainly through the creation of oxygen vacancies at x ≤ 0.5. O2-TPD shows SSC5 possesses the highest oxygen desorption ability among the range of SSCx materials tested. The thermal expansion coefficients (TECs) are high between the transition temperature and 900 °C, showing values typically larger than 20 × 10−6 K−1. All dense materials show high electrical conductivity with a maximum value of ∼1885 S cm−1 for SSC6 in air, while SSC5 has the highest electrical conductivity in nitrogen. EIS analysis of porous electrodes demonstrates that SSC5 has the lowest area specific resistance (ASR) value (0.42 Ω cm2) at 600 °C. Cathodic overpotential testing demonstrates that SSC5 also has the largest exchange current density of 60 mA cm−2 at 600 °C in air. |
| first_indexed | 2025-11-14T07:38:42Z |
| format | Journal Article |
| id | curtin-20.500.11937-21316 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:38:42Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-213162017-09-13T13:53:46Z Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes Guo, Y. Chen, D. Shi, H. Ran, R. Shao, Zongping SmxSr1 − xCoO3 − δ (SSCx) materials are promising cathodes for IT-SOFCs. The influence of Sm content in SSCx (0.2 ≤ x ≤ 0.8) oxides on their oxygen nonstoichiometry, oxygen desorption, thermal expansion behavior, electrical conductivity and electrochemical activity for oxygen reduction is systematically studied by iodometric titration, oxygen-temperature programmed desorption (O2-TPD), dilatometer, four-probe DC conductivity, electrochemical impedance spectroscopy (EIS) and three-electrode polarization test, respectively. Iodometric titration experiments demonstrate that the electrical charge neutrality compensation in SSCx proceeds preferably through the oxidation of cobalt ion for high Sm3+ contents (x ≥ 0.6). However, it proceeds mainly through the creation of oxygen vacancies at x ≤ 0.5. O2-TPD shows SSC5 possesses the highest oxygen desorption ability among the range of SSCx materials tested. The thermal expansion coefficients (TECs) are high between the transition temperature and 900 °C, showing values typically larger than 20 × 10−6 K−1. All dense materials show high electrical conductivity with a maximum value of ∼1885 S cm−1 for SSC6 in air, while SSC5 has the highest electrical conductivity in nitrogen. EIS analysis of porous electrodes demonstrates that SSC5 has the lowest area specific resistance (ASR) value (0.42 Ω cm2) at 600 °C. Cathodic overpotential testing demonstrates that SSC5 also has the largest exchange current density of 60 mA cm−2 at 600 °C in air. 2011 Journal Article http://hdl.handle.net/20.500.11937/21316 10.1016/j.electacta.2010.12.075 restricted |
| spellingShingle | Guo, Y. Chen, D. Shi, H. Ran, R. Shao, Zongping Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| title | Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| title_full | Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| title_fullStr | Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| title_full_unstemmed | Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| title_short | Effect of Sm3+ content on the properties and electrochemical performance of SmxSr1 − xCoO3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| title_sort | effect of sm3+ content on the properties and electrochemical performance of smxsr1 − xcoo3 − δ (0.2 ≤ x ≤ 0.8) as an oxygen reduction electrodes on doped ceria electrolytes |
| url | http://hdl.handle.net/20.500.11937/21316 |