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Excellent performance has been achieved at 400–600 °C for fuel cells based on doped-ceria–carbonate composite electrolytes; however, the fuel cell stability remains a big challenge for practical applications. In this communication, we report the stable performance of a fuel cell based on doped-ceria–carbonate composite electrolyte and Sm_0.5Sr_0.5Fe_0.8Cu_0.2O_3 − δ cathode. At 550 °C, current output of about 400 mAcm^− 2 was continually generated during the non-stop 100 hour measurement under constant voltage of 0.7 V although further investigation is needed for longer term stability. This type of intermediate temperature fuel cell is promising for real applications.