Silver Modified Cathodes for Solid Oxide Fuel Cells

La1-x-ySrxAgyMnO3-delta was synthesized via modified Pechini method. Silver (Ag) was incorporated into La1-x-ySrxAgyMnO3-delta cathode material for solid oxide fuel cells as a catalyst precursor for oxygen reduction reaction. The La1-x-ySrxAgyMnO3-delta perovskite single phase formed at 800 degrees C, and the solubility of Ag in the crystal lattice of the perovskite was up to 5 mol%. The single-phase materials revealed thermal stability in different oxidizing atmospheres up to sintering temperature of the cathode at 1050 degrees C. The exsolution of the metallic Ag nanoparticles was performed at 350-600 degrees C in reducing atmosphere. Scanning electron and scanning transmission electron microcopy revealed a good mechanical contact of the Ag nanoparticles to the surface of the perovskite after reducing conditions. The electrochemical tests of the materials showed a good electrocatalytic effect of nanosized Ag toward oxygen reduction reaction. The electrochemical performance of the cathodes revealed the dependence on electrolyte material and exsolution time. (C) The Author(s) 2019. Published by ECS.