Fabrication and investigation of electrochemical characterization of Ba based cathodes

In this paper, Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) oxide was prepared, using a solid state reaction method. Crystal structure and electrochemical conductivity of this composition were studied by x-ray diffraction and four-point probe method, respectively. The x-ray pattern shows cubic structure. The resistivity was measured from room temperature up to 450 °C in air. At this condition, resistivity was dropped 99 percent of its original value. In the investigation of the electrochemical properties, Dchem, chemical diffusion coefficient and Ea, activation energy for hopping of small polarons were calculated by equation Arrhenius. As our results show increasing the temperature leads to higher values of Dchem. Log (Dchem) and inverse temperature were related by a negative slope.