NDLI: Influence of humidified synthetic air feeding conditions on the stoichiometry of (La1-xSrx)yCoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes under applied potential measured by electrochemical in situ high-temperature XRD method

Content Provider	Springer Nature Link
Author	Kivi, I. Aruväli, J. Kirsimäe, K. Möller, P. Heinsaar, A. Nurk, G. Lust, E.
Copyright Year	2016
Abstract	The solid oxide fuel cell symmetrical cells with porous (La1-x Sr x ) y CoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ electrodes for intermediate temperature applications have been studied under electrochemical polarization and synthetic air + H2O vapor (so called moisturized cathode gas) feeding conditions using high-temperature electrochemical in situ X-ray diffraction method, chronoamperometry, cyclic voltammetry, and impedance spectroscopy methods. Changes in the lattice parameters and electrochemical activity of La0.6Sr0.4CoO3−δ , (La0.6Sr0.4)1.01CoO3−δ , (La0.6Sr0.4)0.99CoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ were calculated depending on the temperature (T), electrode potential (E), and oxygen partial pressure (p O2) applied. Influence of H2O vapor in synthetic air on (La1-x Sr x ) y CoO3−δ parameters was irreversible and continued expansion of (La1-x Sr x ) y CoO3−δ lattice observed in H2O vapor + synthetic air feeding conditions has been observed continuously after changing wet cathode gas to dry oxygen. Nearly, reversible behavior of La0.6Sr0.4Co0.2Fe0.8O3−δ lattice has been established and for La0.6Sr0.4Co0.2Fe0.8O3−δ, the cell volume and polarization resistance started to decrease after changing humidified synthetic air to dry synthetic air in the cathode compartment. For the slightly cationic deficient (La0.6Sr0.4)0.99CoO3−δ , the cathode structure is more stable and the electroreduction of the oxygen was faster. Detailed comparison of experimental data demonstrates that the dependence of the crystallographic parameters on the electrode potential and temperature applied is in a good agreement with the electrochemical impedance spectroscopy data, indicating that the electrocatalytic activity of the cathode decreases with the rise of Fe ion concentration in B-position of LSCF cathode.
Starting Page	361
Ending Page	369
Page Count	9
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	21
Issue Number	2
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-08-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solid oxide fuel cell Cathode In situ HT-XRD Electrochemical impedance Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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Influence of humidified synthetic air feeding conditions on the stoichiometry of (La1-xSrx)yCoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes under applied potential measured by electrochemical in situ high-temperature XRD method

Oxygen Stoichiometry in La0.6Sr0.4CoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ Cathodes under Applied Potential as a Function of Temperature and Oxygen Partial Pressure, Measured by Electrochemical in Situ High-Temperature XRD Method

Oxygen reduction reaction in Pr2NiO4+δ /Ce0.9Gd0.1O1.95 and La0.6Sr0.4Co0.2Fe0.8O3−δ /La0.8Sr0.2Ga0.8Mg0.2O2.80 half cells: an electrochemical study

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

Electrochemicalperformance of La0.6sr0.4co0.2fe0.8o3-δ Based Cathodes for Low Temperature Solid Oxide Fuel Cells

Combinatorial method to optimize oxygen diffusion of (La1-xSrx)1-yCoO3 for SOFC cathodes

Electrochemical evaluation of La2NiO4+δ -based composite electrodes screen-printed on Ce0.8Sm0.2O1.9 electrolyte

Electrochemical response of several cathode configurations prepared with Ba0.5Sr0.5Co0.8Fe0.2O3-δ and Ce0.9Gd0.1O1.95 for IT-SOFC

Synthesis and characterization of PrBaCo2 − x Ni x O5 + δ cathodes for intermediate temperature SOFCs

Influence of humidified synthetic air feeding conditions on the stoichiometry of (La1-xSrx)yCoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes under applied potential measured by electrochemical in situ high-temperature XRD method

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Influence of humidified synthetic air feeding conditions on the stoichiometry of (La1-xSrx)yCoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes under applied potential measured by electrochemical in situ high-temperature XRD method

Oxygen Stoichiometry in La0.6Sr0.4CoO3−δ and La0.6Sr0.4Co0.2Fe0.8O3−δ Cathodes under Applied Potential as a Function of Temperature and Oxygen Partial Pressure, Measured by Electrochemical in Situ High-Temperature XRD Method

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