|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||Comparison of Chromium Poisoning Effects on Performances of (La,Sr)MnO3 and (La,Sr)FeO3 Based Cathodes in Solid Oxide Fuel Cells
||Uday Pal, Ruofan Wang, Srikanth Gopalan, Soumendra N Basu
|On-Site Speaker (Planned)
Performance degradation of the cathodes due to chromium (Cr) contaminants from Fe-Cr alloy interconnects is one of the greatest challenges to overcome for commercialization of solid oxide fuel cells. In this study, anode-supported cells, with (La,Sr)MnO3-based and (La,Sr)FeO3-based cathodes, were fabricated. These cells were electrochemically tested at 800 °C with their cathodes in contact with Fe-Cr alloy interconnect, under different atmospheres and current conditions. Current-voltage measurement and impedance spectroscopy were used to characterize the cell degradation behaviors. The polarization losses at the cathodes were quantified as a function of the extent of Cr-poisoning by curve-fitting the measured current-voltage characteristics to a polarization model. Impedance spectroscopy measurements were used to also confirm the polarization losses. Microstructures of the tested cathodes were examined to determine the location/composition/quantity of the Cr-deposition. From these electrochemical and microstructural analyses, the effects of Cr-poisoning on performances of the two types of cathodes are compared and explained.