PERFORMANCE OF Sc_2O_3-ZrO_2 ELECTROLYTES FOR THE PLANAR SOLID OXIDE FUEL CELL

摘要

The Sc_2O_3-ZrO_2 (ScSZ) system, which has a higher electrical conductivity than Y_2O_3-ZrO_2 (YSZ), was investigated as the electrolyte for planar SOFC. The electrical conductivity of 8mol% Sc_2O_3-ZrO_2 (also 8YSZ) showed a significant decrease by annealing at high temperature. However, the high temperature annealing of 11 mol% Sc_2O_3-ZrO_2 (11ScSZ) showed good stability over 5000hrs. The cell performance with 11 ScSZ as the electrolyte was investigated. High power densities of 0.75W/cm~2 (output was 212W) have been achieved with a three layer 13cm × 13cm cell stack.