Abstract
The complex relationship between the microstructure of the mixed ionic-electronic conductor La0.6Sr0.4CoO3- δ (LSC) and the electrode performance has been investigated on a quantitative level. Symmetric half-cells and single cells with various LSC microstructures were formed using series of raw cathode powders with different particle size distributions. Dual beam FIB-SEM method was used to perform 3-D analysis of microstructure to obtain useful quantitative data such as surface area, volume fractions, pore size distribution, TPB length and tortuosity factor. The results were compared with AC impedance spectroscopy, cyclic voltammetry and chronoamperometry measurements data. It was found that in symmetrical half-cell configuration LSC microstructure, especially the surface area, influences drastically the electrode polarization resistance. The power density was also noticeably affected by the cathode microstructure of the anode supported single cells.
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