Abstract
Degradation tests over 300 h were carried out on the symmetric cell with Zr0.84Y0.16O1.92 (YSZ) supporting electrolyte, Ce0.9Gd0.1O1.95 (CGO) barrier layer, La0.6Sr0.4Co0.2Fe0.8O3–δ − CGO functional layer and La0.6Sr0.4Co0.8Fe0.2O3–δ current collector layer by means of impedance spectroscopy in the temperature range of 500–800°С in air atmosphere and oxygen isotopic exchange method at T = 750 °C, Po2 = 10−2 atm. The evolution of the cell microstructure and elemental distribution between functional layers of the cell were studied by scanning electron microscopy and energy dispersive X-ray microanalysis (SEM − EDX). Polarization resistance values were found to remain unchanged during the 300 h of exposure, and only 10% increase of series resistance to be observed. This result correlates with the SEM − EDX data showing the changes in the distribution of Zr and Ce at the interface before and after 300 h of exposure caused by the cation interdiffusion across the boundary between the electrolyte, the barrier and the functional La0.6Sr0.4Co0.2Fe0.8O3–δ − CGO layers. The influence of the interaction between La0.6Sr0.4Co0.2Fe0.8O3–δ and Ce0.9Gd0.1O1.95 inside the functional composite layer on the electrochemical performance and oxygen surface exchange activity deterioration is discussed.
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