SOFC cathode/YSZ-Non-stationary TPB effects
(0) The origin of the dynamic nature of (La0.85Sr0.15)0.95MnO3±δ (LSM) cathodes with activation and deactivation processes was studied by comparison between measurements on and electrode/YSZ interfacial changes of Au, LSM point electrodes and thin 1/2-1 μm thick LSM film electrodes on YSZ. The techniques used in the study were linear potential sweeps and long term (250-300 h) step polarization. After experiments the electrodes were removed by dissolution and the YSZ contact areas were studied by SEM and EDS. The results show current induced YSZ morphological changes, which lead to an increase in the Three-Phase-Boundary (TPB) length and consequently an activation of the electrode. In the case of LSM electrodes a current enhanced formation of La2Zr2O7 that can result in deactivating phenomena of LSM electrodes was observed. The interplay between these processes can to a large extent explain the dynamic nature of LSM electrodes.
SOFC LSM cathode Gold cathode Non-stationary effects Microstructure
Jimmi Nielsen Torben Jacobsen
Department of Chemistry, Technical University of Denmark, DK-2800, Denmark
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1314-1319
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）