Abstract
The stability of the properties of the composite 40 vol % La0.6Sr0.4MnO3 − δ-60 vol % Zr0.83Y0.17O1.92 (LSM-YSZ) held for 1000 h at a temperature of 800°C and an oxygen pressure of 1.01 kPa and changes in its microstructure were studied by isotope exchange and gas-phase analysis. The oxygen exchange was found to occur by the dissociative adsorption mechanism involving the adsorption forms of oxygen on the triple-phase LSM-YSZ-O2 boundary. The rate-determining step of the oxygen exchange of the composite did not change with time. The rate of oxygen exchange decreased by 22%, which is comparable to the decrease in the length of the LSM-YSZ-O2 triple-phase boundary (∼20%), on which oxygen exchange is dominant. The conductivity of the LSM-YSZ composite increased due to the connectivity of the material.
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Original Russian Text © N.M. Porotnikova, M.V. Ananyev, V.A. Eremin, D.A. Medvedev, A.S. Farlenkov, A.A. Pankratov, S.V. Plaksin, E.Kh. Kurumchin, 2014, published in Elektrokhimiya, 2014, Vol. 50, No. 7, pp. 758–767.
This publication was prepared based on a lecture delivered at the All-Russian Conference with international participation “Fuel Cells and Power Plants,” Chernogolovka, 2013.
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Porotnikova, N.M., Ananyev, M.V., Eremin, V.A. et al. Oxygen isotope exchange in the LSM-YSZ composite under the conditions of long-term tests. Russ J Electrochem 50, 680–689 (2014). https://doi.org/10.1134/S102319351407012X
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DOI: https://doi.org/10.1134/S102319351407012X