Electrode reaction of Sr1−xLaxCo0.8Fe0.2O3−δ with x=0.1 and 0.6 on Ce0.9Gd0.1O1.95 at 600≤T≤800 °C
| Autor: | Alberto Caneiro, Nicolas Grunbaum, Laurent Dessemond, Jacques Fouletier, Fernando Daniel Prado |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
MIXED CONDUCTORS
Analytical chemistry 02 engineering and technology Activation energy Low frequency 010402 general chemistry 7. Clean energy 01 natural sciences COBALTITES ELECTRODE REACTION General Materials Science SOFC Polarization (electrochemistry) Electrical impedance Chemistry Otras Ciencias Químicas Ciencias Químicas IMPEDANCE SPECTROSCOPY General Chemistry Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Dielectric spectroscopy Porous electrode Electrode 0210 nano-technology CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Solid State Ionics. 177:907-913 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2006.02.009 |
| Popis: | The electrode reaction of the perovskite phases Sr1-xLaxCo0.8Fe0.2O 3-δ (x = 0.1 and 0.6) on Ce0.9Gd0.1O1.95 has been investigated by impedance spectroscopy in the temperature range 600 ≤ T ≤ 800 °C. Thick porous electrodes (t ∼ 20 μm) were sprayed on Ce0.9Gd0.1O1.95 and ac impedance spectra were recorded on symmetrical cells at the equilibrium. The analysis of the complex impedance diagrams clearly indicates the presence of two contributions. The low frequency one was assigned to the gas phase oxygen diffusion through the porous electrode and a finite length diffusion (Warburg) impedance was used to describe the high frequency (HF) data. The polarization resistance of the HF impedance contribution (Rw) is higher for x = 0.1 while the activation energy of Rw is higher for x = 0.6. The variations of Rw versus the La content, temperature and thickness indicate that the Warburg-type impedance contains information of both bulk oxygen diffusion and surface processes. © 2006 Elsevier B.V. All rights reserved. Fil: Grunbaum, Nicolas. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Dessemond, L.. Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces; Francia Fil: Fouletier, J.. Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces; Francia Fil: Prado, Fernando Daniel. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Caneiro, Alberto. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect