Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation
Calcium is incorporated into strontium molybdate to form Sr1-xCaxMoO3 as an electronic conductor for solid oxide fuel cells (SOFCs). Metallic molybdenum was observed with the increasing content of Ca substitution for Sr in Sr1-xCaxMoO3. Rietveld refinement reveals the phase transition from cubic to...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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2014
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| Online Access: | https://hdl.handle.net/10356/103914 http://hdl.handle.net/10220/19371 |
| _version_ | 1826114722052702208 |
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| author | Xiao, Peng Ge, Xiaoming Liu, Zhaolin Wang, Jing-Yuan Wang, Xin |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Xiao, Peng Ge, Xiaoming Liu, Zhaolin Wang, Jing-Yuan Wang, Xin |
| author_sort | Xiao, Peng |
| collection | NTU |
| description | Calcium is incorporated into strontium molybdate to form Sr1-xCaxMoO3 as an electronic conductor for solid oxide fuel cells (SOFCs). Metallic molybdenum was observed with the increasing content of Ca substitution for Sr in Sr1-xCaxMoO3. Rietveld refinement reveals the phase transition from cubic to tetragonal perovskite structure, which implies its decreased thermodynamic stability under reducing conditions with increasing content of Ca. X-ray diffraction (XRD) and differential scanning calorimetry-thermo-gravimetric analysis (DSC-TGA) further prove that this Mo ex-solution is reversible. The electrochemical performances of Sr1-xCaxMoO3 towards H2 and CH4 oxidation at 800 ºC are examined. The performance is improved in H2 atmosphere with the introduction of Ca, 330 mW cm-2 of Sr0.5Ca0.5MoO3–Gd0.2Ce0.8O1.9 (GDC) vs. 280 mW cm-2 of SrMoO3–GDC, which can be ascribed to the segregated Mo as the additional catalyst. However, carbon deposition is observed after exposure to CH4 at 800 ºC for both Sr0.7Ca0.3MoO3‒GDC and Sr0.5Ca0.5MoO3‒GDC, in contrast to the absence of carbon on SrMoO3‒GDC. |
| first_indexed | 2024-10-01T03:43:47Z |
| format | Journal Article |
| id | ntu-10356/103914 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:43:47Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1039142023-12-29T06:46:54Z Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation Xiao, Peng Ge, Xiaoming Liu, Zhaolin Wang, Jing-Yuan Wang, Xin School of Chemical and Biomedical Engineering Residues and Resource Reclamation Centre DRNTU::Engineering::Chemical engineering Calcium is incorporated into strontium molybdate to form Sr1-xCaxMoO3 as an electronic conductor for solid oxide fuel cells (SOFCs). Metallic molybdenum was observed with the increasing content of Ca substitution for Sr in Sr1-xCaxMoO3. Rietveld refinement reveals the phase transition from cubic to tetragonal perovskite structure, which implies its decreased thermodynamic stability under reducing conditions with increasing content of Ca. X-ray diffraction (XRD) and differential scanning calorimetry-thermo-gravimetric analysis (DSC-TGA) further prove that this Mo ex-solution is reversible. The electrochemical performances of Sr1-xCaxMoO3 towards H2 and CH4 oxidation at 800 ºC are examined. The performance is improved in H2 atmosphere with the introduction of Ca, 330 mW cm-2 of Sr0.5Ca0.5MoO3–Gd0.2Ce0.8O1.9 (GDC) vs. 280 mW cm-2 of SrMoO3–GDC, which can be ascribed to the segregated Mo as the additional catalyst. However, carbon deposition is observed after exposure to CH4 at 800 ºC for both Sr0.7Ca0.3MoO3‒GDC and Sr0.5Ca0.5MoO3‒GDC, in contrast to the absence of carbon on SrMoO3‒GDC. ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2014-05-19T05:05:46Z 2019-12-06T21:22:58Z 2014-05-19T05:05:46Z 2019-12-06T21:22:58Z 2013 2013 Journal Article Xiao, P., Ge, X., Liu, Z., Wang, J.-Y., & Wang, X. (2014). Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells: Effects of Mo precipitation. Journal of Alloys and Compounds, 587, 326-331. 0925-8388 https://hdl.handle.net/10356/103914 http://hdl.handle.net/10220/19371 10.1016/j.jallcom.2013.10.187 en Journal of alloys and compounds © 2013 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Alloys and Compounds, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI:http://dx.doi.org/10.1016/j.jallcom.2013.10.187]. 6 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Chemical engineering Xiao, Peng Ge, Xiaoming Liu, Zhaolin Wang, Jing-Yuan Wang, Xin Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation |
| title | Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation |
| title_full | Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation |
| title_fullStr | Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation |
| title_full_unstemmed | Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation |
| title_short | Sr1−xCaxMoO3–Gd0.2Ce0.8O1.9 as the anode in solid oxide fuel cells : effects of Mo precipitation |
| title_sort | sr1 xcaxmoo3 gd0 2ce0 8o1 9 as the anode in solid oxide fuel cells effects of mo precipitation |
| topic | DRNTU::Engineering::Chemical engineering |
| url | https://hdl.handle.net/10356/103914 http://hdl.handle.net/10220/19371 |
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