Performance of planar SOFCs with doped strontium titanate as anode materials

Abstract

SOFCs with yttrium- and lanthanum-doped strontium titanate as anode materials were fabricated. A comparison is made of the performance of SOFCs with different types of electrolyte and anode. It was indicated that the SOFC with Y 0.08 Sr 0.92 TiO 3 as anode showed better performance when using YSZ as electrolyte than the one using LSGM as electrolyte, because of the high interfacial resistance between LSGM and Y 0.08 Sr 0.92 TiO 3 . Even Y 0.08 Sr 0.92 TiO 3 shows a lower electrical conductivity; the SOFC with Y 0.08 Sr 0.92 TiO 3 exhibited better performance than the one with La 0.2 Sr 0.8 TiO 3 , due to the high catalytic properties of Y 0.08 Sr 0.92 TiO 3 towards oxidation of hydrogen. The addition of electrolyte materials into the SrTiO 3 -based anode has the possibility to improve cell performance. A single cell with Y 0.08 Sr 0.92 TiO 3 + 10 wt% YSZ as anode and YSZ as electrolyte exhibited a maximum power density of 12.4 and 21.5 mW/cm 2 at 800 and 900°C, respectively.