La2-xPrxNiO4+delta Based Efficient SOFC Cathodes: Effect of Microstructure, Composition and Architecture

15th International Symposium on Solid Oxide Fuel Cells (SOFC), Hollywood, FL, JUL 23-28, 2017International audienceLa2-xPrxNiO4+delta cathodes have been designed by electrostatic spray deposition (ESD) and screen-printing (SP) on Ce0.9Gd0.1O2-delta (CGO). Electrochemical properties are found to be strongly dependent upon the microstructure and architecture of the electrode. For example, triple layer cathode based on 3-D coral nanocrystalline La2NiO4+delta film with a thin (similar to 150 nm), dense interface prepared by ESD topped by a La2NiO4+delta current collector prepared by SP, shows good performance leading to a polarization resistance (R-pol) down to 0.42 Omega cm(2) at 600 degrees C. This architectural design has been extended to La2-xPrxNiO4+delta (with x = 0, 0.5, 1 and 2) cathodes to study the effect of Pr on electrochemical properties and chemical stability. Finally the thin dense sub-layer was replaced by a thin porous (similar to 3-4 mu m) CGO/La2-xPrxNiO4+delta composite sub-layer (x = 0 and 2) which further improves the electrochemical performance