Abstract
The main objectives of H. C. Starck's internal development program for powders used in SOFC applications are to meet the cost targets of the customers as well as the performance requirements during cell operation. Optimization of LSM-powder engineering process resulted in very homogenous powders with good crystallographic properties. The morphological properties can be adapted to customer requirements, the primary particle size can be varied in the range of few micrometers down to submicron powders. Electrochemical performance tests of electrolyte supported single cells with cathodes based on these LSM-powders were conducted at the IWE, Universitat Karlsruhe (TH). The single cells were characterized with respect to performance and long term behavior (> 1000 h) including load and thermal cycling. Current densities of 0.18 A/cm 2 (750°C), 0.43 A/cm 2 (850°C) and 0.7 AJcm 2 (950°C) were achieved at a cell voltage of 0.7 V. The long term stability and thermal cycling behavior was acceptable for mono-layer cathodes; and performance and degradation were in good agreement with the standard type cathode compositions and microstructure.
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