Preparation and Electrochemical Performances of Bi_xSr_(1-x)Co_(0.2)Fe_(0.8)O3 (x = 0.5,0.6,0.7) as Potential Cathode Material for Solid Oxide Fuel Cells

摘要

A perovskite oxide Bi_xSr_(1-x)Co_(0.2)Fe_(0.8)O3 (BSCF, x = 0.5,0.6,0.7) is investigated as a cathode material for solid oxide fuel cells. The BSCF is prepared using solid state reaction method. The XRD shows the perovskite phase is formed at x = 0.5 and impurity phases are detected with x increasing. The area specific resistance value for the BSCF cathode is as low as 0.07 Ω cm~2 at 750 °C as x = 0.5. The electrolyte-supported fuel cell generates good performance with the peak power densities of 0.078,0.057,0.032 Won~(-2) at 750 °C as x = 0.5,0.6,0.7, respectively.