Perovskite-type Nd0.75Ba0.25Co0.8Fe0.2O3-δ cathode for intermediate temperature solid oxide fuel cells

Perovskite-type Nd0.75Ba0.25Co0.8Fe0.2O3-delta (NBCF25) was prepared via solid-state synthesis method at 1300 degrees C in air. Powder X-ray diffraction showed the formation of a single-phase orthorhombic phase in the Pnma space group. It showed minor reactivity with Sr and Mg-co-doped lanthanum gallate (LSGM) when sintered with 30 wt.% LSGM at 1050 degrees C. 4-probe DC chronopotentiometry measurements were performed on the sintered sample pellets and showed a maximum conductivity of 674 S/cm at 700 degrees C. 2-probe AC electrochemical impedance spectroscopy measurements were performed on LSGM pellets from 650 to 800 degrees C to investigate the oxygen reduction property of NBCF25 using a composite slurry (70 wt.% NBCF and 30 wt.% LSGM). It showed the lowest area-specific resistance of 0.07 omega cm(2) at 800 degrees C in air. Impedance spectroscopy genetic programming was used to understand the oxygen reduction reaction.

Automated summary

Perovskite-type Nd0.75Ba0.25Co0.8Fe0.2O3-delta (NBCF25) was synthesized via solid-state method and showed a single-phase orthorhombic structure. It exhibited minor reactivity with Sr and Mg-doped LSGM when sintered at 1050 degrees C. The sintered sample pellets showed a maximum conductivity of 674 S/cm at 700 degrees C. AC electrochemical impedance spectroscopy measurements on LSGM pellets revealed that NBCF25 has the lowest area-specific resistance of 0.07 omega cm(2) at 800 degrees C in air. Impedance spectroscopy genetic programming was used to understand the oxygen reduction reaction.