期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 163, 期 6, 页码 F581-F585出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0031607jes
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资金
- Department of Energy [DE-FG02-05ER46255]
- US National Science Foundation [DMR-0907639, DMR-1506925]
- Austrian Science Fund (FWF) project [P4509-N16, W1243-N16]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF NNCI-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- US Department of Energy Office of Science Laboratory [DEAC02-06CH11357]
- Direct For Mathematical & Physical Scien [1506925] Funding Source: National Science Foundation
- Division Of Materials Research [1506055] Funding Source: National Science Foundation
Symmetric cells with porous La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) electrodes on Gd0.1Ce0.9O1.95 (GDC) electrolytes were aged at 800 degrees C for 800 hours in ambient air. Electrochemical impedance spectroscopy (EIS) measurements performed periodically at 700 degrees C showed a continuous increase of the polarization resistance from 0.15 to 0.34 Omega . cm(2). Three-dimensional (3D) tomographic analysis using focused ion beam-scanning electron microscopy (FIB-SEM) showed negligible changes due to the ageing, suggesting that the observed resistance increase was not caused by electrode morphological evolution. However, an increased amount, by a factor of 3, of a water-soluble Sr rich surface phase on the aged LSCF electrode was detected by an etching procedure coupled with inductively coupled plasma-optical emission spectrometry (ICP-OES). The electrochemical analysis in combination with the microstructural parameters determined by FIB-SEM was used to examine the effect of Sr segregation on the rate of oxygen surface exchange, based on the Adler-Lane-Steele (ALS) model. (C) The Author(s) 2016. Published by ECS. All rights reserved.
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