Synthesis and electrochemical behavior of Ce1−xFexO2−δ as a possible SOFC anode materials

A new family of doped cerias with formula Ce1−xFexO2−δ (x = 0.1, 0.2) have been investigated as anode material for SOFCs. Ce1−xFexO2−δ was synthesized by the citrate method. The electrochemical behavior of anode was analyzed by electrochemical impedance spectroscopy. Ce1−xFexO2−δ (x = 0.1, 0.2) exhibit high activities for the electrochemical oxidation of hydrogen in the temperature range 550–700 °C. The polarization resistance decreases with increasing Fe content while the lower polarization resistances appear in humidified H2 than in dry H2. The polarization resistances of Ce0.9Fe0.1O2−δ (FDC10) and Ce0.8Fe0.2O2−δ (FDC20) show 0.975 Ω cm2 and 0.577 Ω cm2 in humidified H2 at 700 °C, respectively. These results suggest that Ce1−xFexO2−δ is a promising candidate for IT-SOFC anode material.