An anode-supported cone-shaped tubular solid oxide fuel cell (SOFC) with (Ni0.75Fe0.25-5% MgO)/YSZ anode is prepared and is directly operated on dry and moist CO fuel, respectively. At 800 degrees C, the cell exhibits a maximum power density (MPD) of 424 mWcm(-2) for dry CO and 388 mWcm(-2) for moist CO. The durability test results show no significant degradation in performance for this kind of cell operated on either dry or moist CO after an operation time of 40 h at a constant current of 83 mA cm(-2) at 800 degrees C, while the cell with Ni/YSZ anode, in comparison, fails rapidly. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.028301jes] All rights reserved.