Conventional nickel yttria- stabilized- zirconia (Ni - YSZ) solid oxide fuel cell anodes infiltrated with ceria nanoparticles showed sustained high sulfur tolerance. Cathode- supported cells with ceria- infiltrated Ni - YSZ anode delivered power density of 220 - 240 mW cm(-2), at 0.6 V, under an applied current of 0.4 A cm(-2), when operating on humidified H-2 fuel containing 40 ppm H2S, at 973 K, for 500 h. In contrast, the power density of a cell with traditional Ni - YSZ anode dropped to near 0 mW cm(-2), in similar to 13 min, when similarly exposed. The results indicate that ceria nanoparticle infiltration can effectively increase the sulfur tolerance of conventional Ni - YSZ anodes. (c) 2007 The Electrochemical Society.