Electrochemical performance of a copper-impregnated Ni-Ce0.8Sm0.2O1.9 anode running on methane

► Cu impregnated Ni-Ce0.8Sm0.2O1.9 anode is studied in dry methane. ► Incorporated Cu suppresses carbon deposition in the anode. ► A maximum power density of 406 mW/cm2 is obtained at 700 °C in methane. ► The cell maintained 98.6% of its initial voltage after operation for 900 min.