A Fundamental Study on the Chemical Stability of La1−xSrxCo0.2Fe0.8O3−δ Cathodes for Intermediate Temperature Solid Oxide Fuel CellsSource: Journal of Electrochemical Energy Conversion and Storage:;2017:;volume( 014 ):;issue: 003::page 31002DOI: 10.1115/1.4036812Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The chemical stability of La1−xSrxCo0.2Fe0.8O3−δ (x = 0, 0.4, 0.6, and 1) oxides before and after annealing at 750 °C in air is investigated by field emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and environmental transmission electron microscopy (TEM). Results indicate that Sr surface segregation has initially occurred at the sintering stage, and then, the secondary-phase particles are formed with increasing the heat-treatment time at 750 °C in air. Increasing Sr content accelerates Sr segregation on the surface, because of two driving forces including interaction forces in the crystal lattice and thermal activation. AES and XPS results reveal that Sr and Co segregations toward the surface have great contributions to the chemical instability of La1−xSrxCo1−yFeyO3−δ (LSCF) during annealing.
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| contributor author | Qiu, Yufeng | |
| contributor author | Pu, Jian | |
| contributor author | Li, Jian | |
| contributor author | Liu, Yihui | |
| contributor author | Hua, Bin | |
| date accessioned | 2017-11-25T07:20:59Z | |
| date available | 2017-11-25T07:20:59Z | |
| date copyright | 2017/13/6 | |
| date issued | 2017 | |
| identifier issn | 2381-6872 | |
| identifier other | jeecs_014_03_031002.pdf | |
| identifier uri | http://138.201.223.254:8080/yetl1/handle/yetl/4236805 | |
| description abstract | The chemical stability of La1−xSrxCo0.2Fe0.8O3−δ (x = 0, 0.4, 0.6, and 1) oxides before and after annealing at 750 °C in air is investigated by field emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and environmental transmission electron microscopy (TEM). Results indicate that Sr surface segregation has initially occurred at the sintering stage, and then, the secondary-phase particles are formed with increasing the heat-treatment time at 750 °C in air. Increasing Sr content accelerates Sr segregation on the surface, because of two driving forces including interaction forces in the crystal lattice and thermal activation. AES and XPS results reveal that Sr and Co segregations toward the surface have great contributions to the chemical instability of La1−xSrxCo1−yFeyO3−δ (LSCF) during annealing. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | A Fundamental Study on the Chemical Stability of La1−xSrxCo0.2Fe0.8O3−δ Cathodes for Intermediate Temperature Solid Oxide Fuel Cells | |
| type | Journal Paper | |
| journal volume | 14 | |
| journal issue | 3 | |
| journal title | Journal of Electrochemical Energy Conversion and Storage | |
| identifier doi | 10.1115/1.4036812 | |
| journal fristpage | 31002 | |
| journal lastpage | 031002-6 | |
| tree | Journal of Electrochemical Energy Conversion and Storage:;2017:;volume( 014 ):;issue: 003 | |
| contenttype | Fulltext |