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Electrophysical and thermomechanical properties of perovskites La0.5A0.5Mn0.5Ti0.5O3–δ (A = Ca, Sr, Ba) used as fuel cell anodes: the effect of radius of alkali-earth cation

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Abstract

The effect of the radius of the alkali-earth cation substituted into the A sublattice of La0.5A0.5Mn0.5Ti0.5O3–δ (А = Са, Sr, Ba) perovskites on their stability and transport and thermomechanical properties is considered. The increase in the cation radius is shown to improve the phase stability and decrease the conductivity under both oxidative and reductive conditions. The thermal and chemical expansion of La0.5A0.5Mn0.5Ti0.5O3–δ ceramics is studied by dilatometry in controlled atmospheres and a wide temperature range at p(O2)=10–21–0.21 atm. The coefficients of thermal expansion of La0.5A0.5Mn0.5Ti0.5O3–δ are in the interval of (10.7–14.3)× 10–6 K–1, i.e., compatible with those of standard solid electrolytes of solid-oxide fuel cells. The maximum chemical expansion does not exceed 0.2% at isothermal reduction in the CO‒CO2 mixture.

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, ul. Akademika Osip’yana 2, Moscow oblast’, Chernogolovka, 142432, Russia

    V. A. Kolotygin, A. I. Ivanov, S. I. Bredikhin & V. V. Kharton

  2. Center for Research in Ceramics and Composite Materials (CICECO), University of Aveiro, Santiago Campus, 3810-193, Aveiro, Portugal

    V. V. Kharton

Authors
  1. V. A. Kolotygin
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  2. A. I. Ivanov
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  3. S. I. Bredikhin
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  4. V. V. Kharton
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Corresponding author

Correspondence to A. I. Ivanov.

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Original Russian Text © V.A. Kolotygin, A.I. Ivanov, S.I. Bredikhin, V.V. Kharton, 2016, published in Elektrokhimiya, 2016, Vol. 52, No. 7, pp. 697–703.

Published on the basis of the materials of III All-Russia Conference “Fuel Cells and Power Plants on Their Basis,” Chernogolovka, 2015.

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Kolotygin, V.A., Ivanov, A.I., Bredikhin, S.I. et al. Electrophysical and thermomechanical properties of perovskites La0.5A0.5Mn0.5Ti0.5O3–δ (A = Ca, Sr, Ba) used as fuel cell anodes: the effect of radius of alkali-earth cation. Russ J Electrochem 52, 622–627 (2016). https://doi.org/10.1134/S1023193516070077

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  • DOI: https://doi.org/10.1134/S1023193516070077

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