Fuel Cells · 2001 · 44 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsElectrochemistryInorganic ChemistryAnode MaterialsConductive MaterialsElectrode MaterialsInorganic MaterialsPerovskite MaterialsPorous CeramicsConductivityDoped Electrode MaterialsElectronic ConductivityN-type ConductivityP-type ConductivityPerovskite Electrode MaterialsPorous Ceramic MaterialsTitanium Oxides
Two types of lanthanum based chromite-titanate perovskite materials have been tested for use as porous ceramic anodes in SOFC applications. The calcium- or strontium- doped chromium-rich materials, with composition La0.7A0.3Cr0.8Ti0.2O3–δ (A = Ca, Sr), showed p-type conductivity under reducing conditions. The titanium-rich composition, La0.7Ca0.3Cr0.2Ti0.8O3–δ, showed n-type conductivity. Both type of materials were active electrodes in a H2/H2O gas mixture at 850 °C. The electronic conductivity becomes an important limiting factor when the electrode thickness is reduced from 100 μm to 20 μm. For the 20