Electrochemical impedance of dense (La,Sr)CoO3 (LSCO) electrode on single crystalline YSZ electrolyte was investigated in order to clarify the effect of ceria interlayer. Pulsed laser deposition technique was used to fabricate a dense LSCO electrode (∼1.5 μm) and a thin (-100 nm) Ce 0.9Gd0.1O1.95 (CGO) interlayer on a (1 0 0) surface of YSZ. Unlike the direct contact of LSCO on YSZ, LSCO/CGO/YSZ interface showed no significant degradation during the operation. The main part of the resistance was attributed to oxygen exchange reaction at the electrode surface as the case of LSCO electrode on CGO electrolyte. However, a possible minor contribution of the interface resistance was revealed by equivalent circuit analysis. The interface impedance was a single depressed semicircle, in most cases, in a complex impedance plane. It did not depend strongly on oxygen potential and temperature. It ranged from 0.3 to 1 Ωcm-2, which may be significant in a practical porous electrode with smaller contact area.
|Number of pages||8|
|Publication status||Published - 2005 Dec 1|
|Event||9th International Symposium on Solid Oxide Fuel Cells, SOFC IX - Quebec, Canada|
Duration: 2005 May 15 → 2005 May 20
|Other||9th International Symposium on Solid Oxide Fuel Cells, SOFC IX|
|Period||05/5/15 → 05/5/20|
ASJC Scopus subject areas