Fabrication and characterization of SDC–LSGM composite electrolytes material in IT-SOFCs

The electrolytes materials Ce0.85Sm0.15O1.925 (SDC) and La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) were synthesized by means of glycine-nitrate process (GNP), respectively, then the composite electrolytes were prepared by mixing SDC and LSGM. Its electrical properties were investigated. It shows that when the composition was 90 wt.% SDC and 10 wt.% LSGM (SL91), the electrolyte has higher electrical conductivity as compared to SDC in the temperature of 500–700 °C. The V–I characteristics of single cell shows that the maximum output power density was 0.25 W/cm2 at 800 °C and maximum current density was 1.06 A/cm2. The open-circuit voltage (OCV) was higher than the cell using single SDC as electrolyte at the working temperature (600–800 °C).