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• W2804124753 abstract "La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) symmetric-electrode cells with Gd0.1Ce0.9O1.95 (GDC) electrolytes were aged in ambient air at temperatures ranging from 550 to 950°C for times up to 1400 h, without current/polarization. Electrochemical impedance spectroscopy measurements, taken periodically during the tests at a testing temperature of 700°C for cells aged at 700, 750 and 800°C, showed a continuous increase in polarization resistance. Focused ion beam-scanning electron microscopy (FIB-SEM) 3D tomography showed that the LSCF electrode did not coarsen measurably at ageing temperatures ≤ 800°C, ruling out LSCF microstructural changes as the mechanism behind the resistance increase. On the other hand, Sr surface segregation, determined by chemical etching with inductively coupled plasma-optical emission spectrometry (ICP-OES) detection, was found to increase with increasing ageing time and temperature > 650°C. The effect of Sr surface segregation on the oxygen surface exchange and diffusion processes is quantified by comparing the measured electrochemical and microstructural data." @default.
• W2804124753 created "2018-06-01" @default.
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• W2804124753 date "2018-01-01" @default.
• W2804124753 modified "2023-10-18" @default.
• W2804124753 title "Degradation Mechanisms of Porous La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δSolid Oxide Fuel Cell Cathodes" @default.
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• W2804124753 doi "https://doi.org/10.1149/2.1211807jes" @default.
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