Improving and degrading the oxygen exchange kinetics of La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−<i>δ</i></sub> by Sr decoration
Matthäus Siebenhofer, Christoph Riedl, Andreas Nenning, Werner Artner, Christoph Rameshan, Alexander Karl Opitz, Jürgen Fleig, Markus Kubicek
Abstract
in the measurement atmosphere, causing a decrease of the oxygen exchange rate. These results are in excellent agreement with the concept of surface acidity as a descriptor for the effect of surface decorations, providing further insight into the oxygen exchange kinetics on SOFC cathode surfaces and its degradation. In addition, this study shows that Sr segregation itself initially does not lead to performance degradation but that segregated SrO readily reacts with acidic compounds, reducing the catalytic capability of mixed conducting oxides.
Topics & Concepts
X-ray photoelectron spectroscopyCathodeOxygenKineticsOverpotentialDeposition (geology)Partial pressureOxideAnalytical Chemistry (journal)Chemical engineeringMaterials scienceDielectric spectroscopyChemistryElectrodeEnvironmental chemistryMetallurgyPhysical chemistryElectrochemistryGeologyPaleontologySedimentQuantum mechanicsEngineeringOrganic chemistryPhysicsAdvancements in Solid Oxide Fuel CellsElectronic and Structural Properties of OxidesCatalytic Processes in Materials Science