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

Abstract

A complex study of conducting and catalytic properties of composite materials of Pr 2 CuO 4 -xCe 0.9 Gd 0.1 O 1.95 (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. Elec trocatalytic properties of composite cathodes supported on the surface of the Ce 0.9 Gd 0.1 O 1.95 (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 polariza tion 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 cm 2 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.

Seal Glass for Solid Oxide Fuel Cells

“…The melting point of the composition is 867.25 C. The electrical resistivity of this mixture is 4MΩ cm which is 8 times lower than the original BCABS. The TEC is matched with SOFCs based on the GDC 10 electrolyte that is valued at around 12.17-12.78 Â 10 À6 / o C [12]. The microstructure between cathode and glass is free of cracks and shows good adherence to both surfaces.…”

Electrochemical Property Assessment of Pr2CuO4 Submicrofiber Cathode for Intermediate-Temperature Solid Oxide Fuel Cells

“…Pr2CuO4 has already been studied as potential cathode material in IT-SOFC [23][24][25][26][27][28][29] .…”