Composite anodes consisting of Ni, Y-doped SrTiO3 (YST), and Y2O3-stabilized ZrO2 (YSZ) were fabricated; the Ni species was impregnated to YST-YSZ powder and then the resulting powder was fired onto the electrolyte at 1200 degrees C for 5 h in air. The conductive oxide of YST sintered in air showed a conductivity of 7.2 S cm(-1) after reduction in humidified hydrogen (1.2% H2O-H-2) for 100 h and behaved as a metallic conductor with respect to the temperature dependence of conductivity. The influence of the nickel content in the anode of Ni/YST-YSZ on the electrochemical property was studied under 0.6% H2O-H-2 atmosphere. The cermet of 10 wt % Ni/YST-YSZ showed the minimal polarization resistance among the catalysts with the nickel content in the range of 5-50 wt %. An electrolyte-supported cell employing this anode exhibited a power density of 0.34 W cm(-2) at 0.5 V at 1000 degrees C despite the extremely low content of Ni. Stable power generation was attained at a constant terminal voltage of 0.7 V in humidified hydrogen (0.6% H2O-H-2) for 21 h. Even after five consecutive redox cycles, the cell performance remained unchanged mainly due to the stable porous framework of YST-YSZ with a low Ni content. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3421792] All rights reserved.