An important aspect of SOFC performance is long-term stability. Four "long-term" tests (1000–2000 hr) are presented and problems concerning the test set-up are discussed. The cells were tested at 850°C under four different sets of conditions with respect to current density and water vapor content. The performance was observed to decrease in all four cases. Depending on the conditions, the power density decreased between 0.3 and 4.6% over 1000 hrs of test. The area specific resistances of the cells were between 0.27 and 0.39 Ωcm 2 .
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Rasmus Barfod (2003) studied this question.
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