on Praseodymium Cuprate for Intermediate
Temperature Solid Oxide Fuel Cells
N. V. Lyskova,z, L. M. Kolchinab, M. Z. Galina, and G. N. Mazob
aInstitute of Problems of Chemical Physics, Russian Academy of Sciences,
pr. akad. Semenova 1, Chernogolovka, Moscow Region, 142432, Russia
bLomonosov Moscow State University, Vorob’evy gory, GSP-2, 119991 Moscow, Russia
Received July 23, 2014
Abstract—A complex study of conducting and catalytic properties of composite materials of Pr2CuO4–
xCe0.9Gd0.1O1.95 (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 500–900C. Analysis of polarization resistance (R
)
isotherms on the partial pressure of oxygen shows that the rate-determining steps of the oxygen reduction reac-
tion on the cathode are dissociation of adsorbed molecular oxygen and charge transfer. It is found that the min-
imum of polarization resistance corresponding to 0.4 Ohm cm2 at 700C in air is reached in the range of inter-
mediate temperatures (500–750C) 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–tem-
perature solid oxide fuel cells.
Keywords: praseodymium cuprate, composite cathode, electrode/electrolyte interface, impedance spectros-
copy, SOFC
DOI: 10.1134/S1023193515050079
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