Evaluation of Sm0.95Ba0.05Fe0.95Ru0.05O3 as a potential cathode material for solid oxide fuel cells

摘要

The perovskite Sm0.95Ba0.05Fe0.95Ru0.05O3 (SBFR) is investigated to assess its possible use as a potential cathode material for solid oxide fuel cells. SBFR shows good thermal stability and has good chemical compatibility with the yttria-stabilized zirconia (YSZ) electrolyte below 1000 degrees C. In the oxygen partial pressure (pO(2)) range of 0.01-0.6 atm, the electrical conductivity of the SBFR sample follows a pO(2)(1/6) dependency, attributed to p-type electronic conductor behavior. Polarization resistance (R-p) increases with a decrease in pO(2) (n = 0.53) and decreases with an increase in the amplitude of the applied direct current (DC) bias at 800 degrees C. The Rp values of the SBFR sample on the YSZ electrolyte in symmetrical cells are 0.28, 0.22, 0.15 Omega cm(2) at 700, 750 and 800 degrees C, respectively, and the maximum power density of the YSZ electrolyte-supported single cell with the Ni-YSZ anode and SBFR cathode reaches 465 W cm(-2) at 800 degrees C using pure H-2 as a fuel and ambient air as an oxidant.