화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.35, No.17, 9401-9404, 2010
Fabrication and investigation of electrochemical characterization of Ba based cathodes
In this paper, Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta) (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 degrees C in air. At this condition, resistivity was dropped 99 percent of its original value. In the investigation of the electrochemical properties, D(chem), chemical diffusion coefficient and E(a), activation energy for hopping of small polarons were calculated by equation Arrhenius. As our results show increasing the temperature leads to higher values of D(chern). Log (D(chem)) and inverse temperature were related by a negative slope. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.