Stability of Ni/Y-doped SrTiO 3 -YSZ Anode in Reduction-oxidation Cycles

A composite anode consisting of 3 vol% Ni, Y-doped SrTiO3 (YST) and Y2O3 stabilized ZrO2 (YSZ) was fabricated: the Ni species was impregnated to YST-YSZ powder and then the resulting powder was fired onto the electrolyte at 1200ºC for 5 h in air. A single cell employing this anode exhibited the power density of 0.28 W cm-2 at 0.7 V at 1000ºC despite its extremely low content of Ni. Stable power generation was attained at the constant terminal voltage of 0.7 V in humidified hydrogen (0.6% H2O-H2) for 22 h. Even after five consecutive redox cycles, the cell performance remained unchanged mainly due to the stable porous framework of YST-YSZ with low Ni content.