Abstract
The microstructural integrity of Ni-based fuel electrodes is mandatory for long term SOFC operation. Degradation due to microstructural changes as Ni-agglomeration, sintering and densification has to be prevented by an appropriate microstructure. In this work the performance of 4 types of nickel-ceria based fuel electrodes, which differ with respect to layer sequence and manufacturing processes, is evaluated by electrochemical impedance spectroscopy at the nominal operating temperature of 600 °C. Accelerated degradation tests at increased operating temperatures of 700 °C and 900 °C are performed on the one based on a GDC infiltrated Ni-backbone that performed the best. The polarization resistance at 600 °C recorded at the beginning and the end of life increased by up to 100%. Microstructural analysis of the electrodes at different aging states revealed strong microstructural changes of fine infiltrated GDC structures and Ni agglomeration at higher operating temperature.
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