NiO-Fe(2)O(3)/Gadolinium-doped CeO(2) (GDC), NiO/GDC anode-supported fuel cells were compared at intermediate temperature to investigate the effect of ferrum (Fe) on anode microstructure and the cell performance. The porosity of Fe(2)O(3)-containing anode tubes are 36.3% (those sintered at 1350 degrees C) and 31.8% (those sintered at 1400 degrees C), which are respectively 1.1% and 5.9% higher than that of the tubes without Fe(2)O(3). The effect of Fe on microstructure of anode has also been indicated by analyzing the volume fraction of the different-size pores. At the operating temperature of 600 degrees C, the maximum power density increased nearly 100% using Fe-Ni (after reducing) bimetal anode. From the impedance spectra, it is deduced that the improvement in power density is due to the decrease of overpotential resistance (low frequency part) related to gas transportation. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.