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Optimization of composite cathode based on praseodymium cuprate for intermediate-temperature solid oxide fuel cells

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Abstract

A complex study of conducting and catalytic properties of composite materials of Pr2CuO4−x Ce0.9Gd0.1O1.95 (x = 20, 33, 50 wt %) is carried out. Conductivity of composites is measured using a four probe technique in air. Analysis of the dependence of conductivity on the composition at a given temperature shows that the conducting properties of composites can be described based on the percolation model. Electrocatalytic properties of composite cathodes supported on the surface of the Ce0.9Gd0.1O1.95 (GDC) solid electrolyte using the screen printing technique were studied by the impedance spectroscopy technique in the range of oxygen partial pressures of 10−2 to 0.21 atm at the temperatures of 500–900°C. Analysis of polarization resistance (R η) isotherms on the partial pressure of oxygen shows that the rate-determining steps of the oxygen reduction reaction on the cathode are dissociation of adsorbed molecular oxygen and charge transfer. It is found that the minimum of polarization resistance corresponding to 0.4 Ohm cm2 at 700°C in air is reached in the range of intermediate temperatures (500–750°C) for the composition containing 33 wt % GDC. On the basis of the obtained data, the PCO-33GDC composite can be considered as a promising cathode material for intermediate-temperature solid oxide fuel cells.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, pr. akad. Semenova 1, Chernogolovka, Moscow Region, 142432, Russia

    N. V. Lyskov & M. Z. Galin

  2. Lomonosov Moscow State University, Vorob’evy gory, GSP-2, 119991, Moscow, Russia

    L. M. Kolchina & G. N. Mazo

Authors
  1. N. V. Lyskov
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  2. L. M. Kolchina
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  3. M. Z. Galin
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  4. G. N. Mazo
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Correspondence to N. V. Lyskov.

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Original Russian Text © N.V. Lyskov, L.M. Kolchina, M.Z. Galin, G.N. Mazo, 2015, published in Elektrokhimiya, 2015, Vol. 51, No. 5, pp. 520–528.

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Lyskov, N.V., Kolchina, L.M., Galin, M.Z. et al. Optimization of composite cathode based on praseodymium cuprate for intermediate-temperature solid oxide fuel cells. Russ J Electrochem 51, 450–457 (2015). https://doi.org/10.1134/S1023193515050079

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  • DOI: https://doi.org/10.1134/S1023193515050079

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