The relationship between the cathode microstructure and electrochemical performance of lanthanum strontium manganite (LSM) /yttria stabilized zirconia (YSZ) SOFCs was studied for the isochronal sintering at temperatures between 950°C and 1400°C for 1 hour. Previous studies have shown that the Triple-Phase-Boundary (TPB) length at the cathode/electrolyte interface contributes to charge transfer resistance. However, it is unclear the role of the tertiary phase formation. This study investigated the effects of 1) TPB length and 2) tertiary phase formation on the charge transfer resistance. Techniques were developed using a dual-beam FIB system to automatically slice serial-sections of the cathode. These images were assembled to create a 3-D image of the microstructure. Also, cross-section TEM samples were made using the Omniprobe manipulator. The homogeneity of the sample was analyzed using a disector probe. High-resolution TEM-EDS was used to characterize tertiary phase formation at the cathode/electrolyte interface.It was found that TPB length was reduced from 1.41±0.07 µm/µm 2 to 0.21±0.01 µm/µm 2 as the sintering temperature increased from 950°C to 1400°C. Formation of a low conductivity tertiary phase was observed above 1200°C, which appears to contribute to the increase in charge transfer resistance.

No abstract

No abstract

Der Artikel beschreibt auf nicht‐mathematische Weise die Ergebnisse von neueren Forschungen und die Bedingungen, unter denen eine kontinuierliche Kristallisationsapparatur arbeitet.