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Functional properties and electrochemical performance of dual-phase Pr0.9Y0.1BaCo2O6−δ–Ce0.8Sm0.2O1.9 composite cathodes

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Abstract

The dual-phase composites are obtained by mixing perovskite-like cobaltite Pr0.9Y0.1BaCo2O6–δ and samarium-doped ceria Ce0.8Sm0.2O1.9 in weight proportions 90/10, 70/30, and 50/50. The absence of chemical interactions between the components at heating up to 1100 °С is confirmed by X-ray powder diffraction measurements. The partial dilution of the cobaltite is accompanied with decreasing thermal expansion of the composite. The impedance measurements reveal linear changes of the area-specific resistance with inverse temperature that correspond to the activation energy values of about 0.9 and 0.8 eV for 70/30 and 50/50 composites, respectively. The overvoltage for oxygen electro-reduction with current density 1 A/cm2 does not exceed 80 mV at 700 °С. The high electrical conductivity, moderate thermal expansion, and appreciable electrochemical activity single out the mixture of Pr0.9Y0.1BaCo2O6–δ (70 wt%) and Ce0.8Sm0.2O1.9 (30 wt%) as a promising composite cathode material for intermediate temperature solid oxide fuel cell applications (IT–SOFC).

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Acknowledgements

This work was supported by the Russian Foundation for Basic Research under grant № 16–33–60202. The DRT analysis of EIS spectra was supported by the Russian Foundation for Basic Research under grant № 16–03–00434.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, RAS, Pervomaiskaya str.91, Yekaterinburg, Russia, 620990

    S. N. Marshenya, B. V. Politov, A. Yu Suntsov & V. L. Kozhevnikov

  2. Institute of High-Temperature Electrochemistry, RAS, Academicheskaya str. 20, Yekaterinburg, Russia, 620137

    D. A. Osinkin

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  1. S. N. Marshenya
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  2. B. V. Politov
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  3. D. A. Osinkin
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Correspondence to A. Yu Suntsov.

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Marshenya, S.N., Politov, B.V., Osinkin, D.A. et al. Functional properties and electrochemical performance of dual-phase Pr0.9Y0.1BaCo2O6−δ–Ce0.8Sm0.2O1.9 composite cathodes. J Solid State Electrochem 22, 1863–1869 (2018). https://doi.org/10.1007/s10008-018-3894-2

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  • DOI: https://doi.org/10.1007/s10008-018-3894-2

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