Abstract
In the past much effort was spent for the detailed understanding of the electrochemical behavior of SOFC single cells. However, these results cannot be transferred to the entire SOFC stack technology because of huge differences in fuel utilization, temperature distribution, gas flow design and electrical current load. Therefore, proper and detailed understanding of the electrochemical behavior of the SOFC stacks is necessary for the successful introduction and acceptance of the SOFC technology into the global energy market. The paper presents the electrochemical behavior of SOFC stacks with anode supported cells (ASC) in the cassette design at different operating conditions. The focus lies on the investigation of the resistances of the stack repeat units as a function of operating temperature and fuel gas flow rate. The stacks were investigated by current-voltage curves, electrochemical impedance spectroscopy (EIS) and gas analysis.
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