Development of lanthanum-doped praseodymium cuprates as cathode materials for intermediate-temperature solid oxide fuel cells

摘要

Electrochemical properties of the Pr2.5LaxCuO4 (x = 0.05; 0.1; 0.3) (PLCO) oxides in oxygen reduction reaction (ORR) were examined towards their applicability as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Pr1.95La0.05CuO4 (PLCO0.05) was defined as a favorable basis for the composite cathode material due to its conducting, thermomechanical and electrocatalytic properties. The optimization of the annealing temperature of the PLCO0.05-xGDC composite electrode deposited on GDC solid electrolyte surface had shown that the lowest area specific resistance (ASR) was achieved at 850 degrees C. The highest electrochemical activity in ORR was achieved for the composition containing 40 wt% GDC in the temperature range of 600-750 degrees C. The application of PLCO0.05-40GDC composite cathode instead of pure PLC00.05 made it possible to reduce ASR up to 10 times at 700 degrees C in air (from 0.87 Omega.cm(2) (x = 0 wt%) to 0.08 Omega.cm(2) (x = 40 wt%)). According to the data obtained, PLCO0.05-40GDC can be considered as a promising cathode material for IT-SOFCs.