Improvement in Thermal Cycling Durability of SOFCs Using LaGaO[sub 3]-Based Electrolyte by Inserting Convex Sm[sub 0.5]Sr[sub 0.5]CoO[sub 3] Interlayer

Abstract

Improved thermal cycling durability of a solid oxide fuel cell (SOFC) using a LaGaO 3 -based electrolyte was studied by inserting a thin Sm 0.5 Sr 0.5 CoO 3-δ (SSC55) cathode interlayer with a submicron-sized convex. The thin SSC55 interlayer was prepared on a SDC20-LSGM9182 bilayer film by pulsed layer deposition. The resulting maximum power density (MPD) was 1.99 W/cm 2 at 973 K, and the open circuit voltage was close to the theoretical value. In addition, the thermal cycling tolerance was significantly improved. The decrease in MPD was only 4% over three thermal cycles from 973 to 298 K. The MPD of a cell with no SSC55 interlayer decreased significantly.