MgO-ZrO₂固体電解質型燃料電池の特性評価

抄録

Solid oxide fuel cell(SOFC) using a magnecia stabilized zirconia(MSZ) is favoured for its properties of lower operating temperature and higher ionic conductivity than those of SOFC using the yittria stabilized zirconia(YSZ). In this paper, SOFC using MSZ is studied under the various conditions including the operating temperature and the quantity of the doped magnecium oxide(MgO). When SOFC using MSZ prepared by the sintering of mixture of 13mol%MgO and 87mol%ZrO₂ is operated at temperature regions of 880 to 1000°C, the cell efficiency drops with time in order to cause the phase transition in crystal structures of the solid oxide electrolyte. However, at operating temperatures from 800 to 860°C, the phase transition and the drop of the cell voltage were not observed. As a result, it was found that SOFC using MSZ is sufficient to operate at a temperature of 840_??_860°C.