Electrolyte-supported single fuel cells based on yttria-stabilized zirconia components with a ceria-based catalytic layer added to the anode were operated with three different fuels: hydrogen, methane, and ethanol. Methane and ethanol were directly fed to the fuel cells without water or any oxidizing agent. Fuels were interchanged during continuous polarization and fuel cell accumulated ～160 hours of operation delivering comparable current densities for each fuel. This result was supported by stability curves, impedance spectroscopy, and energy-dispersive X-ray spectroscopy analyses, which showed that deleterious carbon deposits were absent in the anode of tested fuel cells.
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