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Solid oxide fuel cells (SOFCs) have received great attention due to their high-energy conversion efficiency,extremely low emission and excellent fuel flexibility.Recently hydrocarbons and alcohols have received considerable attentions as fuels for SOFC due to their high availability.Since CO is an intermediate product in the reforming process of hydrocarbons/alcohols,it is important to investigate the fuel cell operated on CO fuel.In this paper,the electrochemical performance of SOFCs fueled with CO at intermediate-/high-temperature was investigated.Two anode-supported single cells with the configurations of Ni+SDC/SDC/BSCF (cell #1) and Ni+ScSZ/ScSZ/LSM (cell #2) were prepared.The peak power density of cell #1 fueled with CO was 208 mW cm-2 at 650℃,which was much lower than that with H2.In the case of cell #2,the peak power density reached 261 mW cm-2 at 850℃ with CO,which was only slightly lower than that with H2.It is feasible to operate SOFC with CO as the fuel.