Characterization and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3-based composite cathode for IT-SOFCs
Date Issued
2012
Date
2012
Author(s)
Lin, Ting-Yu
Abstract
This study, select the several composite cathode materials for multiple layered half-cell (cathode / electrolyte) fabrication and precede analysis of the interface resistance and polarization resistance, and then further fabricated a full single cell, measuring power output. Electrode material Gd2O3 doped cerium spherical powder with different particle sizes were synthesized by co-precipitation method, preparation of, add of cerium oxide (GDC). In addition, by using the Pechini method to synthesize GDC and LSCF powder as the barrier layer. With the addition of 78nm ~ 2.5 um GDC powder in the lanthanum strontium cobalt iron oxide (LSCF6428) cathode to reduce the cathodic polarization resistance and prevent the grain coarsening. The lanthanum strontium cobalt iron oxide (LSCF6428) was used for composite cathode material, the powder can be successfully synthesized with high surface area and with single phase and homogeneous composition by solid-state reaction method and the Pechini method.
Finally, the half-cells fabricated by spin coating with different microstructure were taken in to measurement of AC-impedance. The interface polarization resistance and contact resistance were analyzed by the half-cells with single layer to multi-layer cathode structure. The optimized four layered cathode microstructure was also applied with the NiO/YSZ as anode material into the anode support single cell for I-V test, and the result of power density was 362 mW/cm2
Subjects
SOFC
GDC
LSCF
co-precipitation route
Pechini method
composite cathode
polarization resistance
contact resistance
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-101-R99527048-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):8c50016f825799d87d3d0ffc66494263