The electrochemical behavior of a porous electrode based on Pr 2CuO4 (PCO) screen printed on the surface of Ce 0.9Gd0.1O1.95 (CGO) solid electrolyte is studied by impedance spectroscopy. The rate-determining stages of the oxygen reduction reaction at the PCO/CGO interface are found for the oxygen partial pressure interval of 30-105 Pa and temperatures of 773-1173 K. Changeover of the rate-determining stage of electrode reaction is shown to occur depending on the temperature and the oxygen partial pressure. The PCO electrode polarization resistance is 1.7 Ω cm2 at 973 K in air and remains constant at thermocycling of the electrochemical cell in the temperature range of 773-1173 K. Based on the found data, PCO can be considered as the promising cathodic material for solid-oxide fuel cells operating at moderate temperatures (773-973 K).
- cathodic material
- electrode/electrolyte interface
- impedance spectroscopy
- praseodymium cuprate