Transport and electrochemical properties of Sr2Fe1.5Mo0.5O6 + Ce0.8Sm0.2O1.9 composite as promising anode for solid oxide fuel cells

Transport and electrochemical properties of Sr2Fe1.5Mo0.5O6 + Ce0.8Sm0.2O1.9 composite as... Study of the physical and electrical properties of the Sr2Fe1.5Mo0.5 + Ce0.8Sm0.2O1.9 composite material and its electrochemical properties as an electrode in contact with lanthanum gallate based electrolyte based on in reducing media revealed an increase in the dilatometric curve slope at around 400°C. This corresponds to an increase in the thermal expansion coefficient from 12.8 × 10–6 to 19.3 × 10–6 °C–1. An analysis of electrochemical impedance spectra by the relaxation-time-distribution method demonstrated the electrode reaction is localized in the frequency range 500–0.01 Hz. The electrical conductivity of the material under study was found to be about 17 S cm–1 at 800°C in the atmosphere of humid hydrogen. The polarization resistance under the same conditions was about 0.15 Ω cm2. The dependence of the polarization resistance on the partial pressure of hydrogen is linear with a reaction order of about–0.4, whereas that on the partial pressure of water has the opposite slope with a reaction order of about 0.2. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Transport and electrochemical properties of Sr2Fe1.5Mo0.5O6 + Ce0.8Sm0.2O1.9 composite as promising anode for solid oxide fuel cells

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Publisher
Pleiades Publishing
Copyright
Copyright © 2017 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427217010074
Publisher site
See Article on Publisher Site

Abstract

Study of the physical and electrical properties of the Sr2Fe1.5Mo0.5 + Ce0.8Sm0.2O1.9 composite material and its electrochemical properties as an electrode in contact with lanthanum gallate based electrolyte based on in reducing media revealed an increase in the dilatometric curve slope at around 400°C. This corresponds to an increase in the thermal expansion coefficient from 12.8 × 10–6 to 19.3 × 10–6 °C–1. An analysis of electrochemical impedance spectra by the relaxation-time-distribution method demonstrated the electrode reaction is localized in the frequency range 500–0.01 Hz. The electrical conductivity of the material under study was found to be about 17 S cm–1 at 800°C in the atmosphere of humid hydrogen. The polarization resistance under the same conditions was about 0.15 Ω cm2. The dependence of the polarization resistance on the partial pressure of hydrogen is linear with a reaction order of about–0.4, whereas that on the partial pressure of water has the opposite slope with a reaction order of about 0.2.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Apr 25, 2017

References

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