E Electrostatic spray deposited Ca3Co4O9+delta and Ca3Co4O9+delta/Ce0.9Gd0.1O1.95 cathodes for SOFC A comparative impedance analysis study

摘要

Mixed conducting Ca3Co4O9+delta (CCO) is an interesting cathode material for application in Solid Oxide Fuel Cells (SOFC). In a previous study it has been shown that addition of Ce0.9Gd0.1O1.95 (CGO) significantly enhances the electrode properties, reducing the Area Specific Resistance (ASR) to similar to 0.5 Omega cm (2) at 700 degrees C for the CCO/CGO 50/50% composition. As the microstructure of a composite electrode has a significant influence on the frequency dispersion, it is of interest to prepare electrodes with quite different microstructures. Electrostatic Spray Deposition (ESD) is a technique that is able to produce a large variety of microstructures by modifying the process parameters. Very different microstructures can help in elucidating the major charge transport and transfer processes in an electrode.