AI Article Synopsis
- The study aims to enhance the performance of LaSrMnO (LSM) cathodes in solid oxide fuel cells by adding YFeCoO (YFC) for operation between 500-800 °C.
- Monophasic YFC is created at 950 °C and mixed with LSM to form different composite cathodes that are analyzed for their structural and electrochemical properties.
- Results show that LSM1 (YFC/LSM ratio of 1:19) exhibits lower polarization resistance and better efficiency compared to LSM and LSM2, especially at lower temperatures.
Article Abstract
The high efficiency of solid oxide fuel cells with LaSrMnO (LSM) cathodes working in the range of 800-1000 °C, rapidly decreases below 800 °C. The goal of this study is to improve the properties of LSM cathodes working in the range of 500-800 °C by the addition of YFeCoO (YFC). Monophasic YFC is synthesized and sintered at 950 °C. Composite cathodes are prepared on CeSmO electrolyte disks using pastes containing YFC and LSM powders mixed in 0:1, 1:19, and 1:1 weight ratios denoted LSM, LSM1, and LSM1, respectively. X-ray diffraction patterns of tested composites reveal the presence of pure perovskite phases in samples sintered at 950 °C and the presence of SrFeO, YMnO, and LaSrMnO phases in samples sintered at 1100 °C. Electrochemical impedance spectroscopy reveals that polarization resistance increases from LSM1, by LSM, to LSM2. Differences in polarization resistance increase with decreasing operating temperatures because activation energy rises in the same order and equals to 1.33, 1.34, and 1.58 eV for LSM1, LSM, and LSM2, respectively. The lower polarization resistance of LSM1 electrodes is caused by the lower resistance associated with the charge transfer process.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8779859 | PMC |
| http://dx.doi.org/10.3390/ma15020642 | DOI Listing |
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