Enhanced Ionic Conductivity of Ceria-Based Compounds for Electrolyte Application in SOFCs

摘要: Higher ionically conductive solid oxide electrolytes operating at intermediate temperatures (400 to 700?C) are critical for the application of portable power generation device based on fuel cells (SOFCs). Doped ceria materials show promise due their higher ionic conductivity, and good thermodynamic stability in temperature range. Among doped electrolytes, Gd-doped (GDC) is widely accepted exhibit highest conductivity. To further enhance conductivity this work, novel co-doping strategies tested. Co-doping Sm3+ Nd3+ as dopant cations resulted an increase It shown that 550oC, co-doped than GDC. From literature, it known depends upon processing variables. Thus, have a clear understanding trend function type, consistent set data developed different synthesized under similar conditions. was observed single dopants, best cation host ceria. The radius (rc) determined trivalent system high temperatures. elastic strain systems measured 500oC, ? relationship rc concept not successful strategy Further, effect conditions material Co-doped (15 mol% content) using routes. grain co-precipitation technique microwave sintering around 45 % GDC (10 550oC. Finally, performance anode-supported prototype SOFC electrolyte analyzed An exceptionally density 1.38 W/cm2 obtained 650oC, 90 cc/minute dry air wet hydrogen cathode anode sides, respectively. tested cell shows ceramic can successfully generate SOFCs working ( en )