부산대학교 도서관

Solid-oxide fuel cells offer numerous competitive advantages, including higher efficiency and low emissions of greenhouse gases. Material synthesis and selection of its components, including cathode, anode, electrolyte, and interconnect, play a vital role in obtaining the goal. La1-xSrxY0.75Co0.25O3 (x= 0.10, 0.20, 0.30, 0.40) perovskite material in the crystalline form of size 185nm to 245nm has been synthesized for its applications. Substituent increases the density value. The material exhibited weight loss on and above 400 oC temperature confirming the creation of oxygen vacancy on reduction of Y3+/Co3+, and the temperature expansion coefficient decreased with Sr2+ substitution. Impedance analysis of all the samples confirmed that the material is dielectric enough and conductivity increased with temperature, frequency, and doping content. The conductivity of the material was found to be more than 100 S/cm above 600 oC, and the activation energy of the material was found to be 0.19 eV for compositions 0.10 and 0.17 eV for 0.40. Observed parameters confirmed that the material synthesized is appropriate for the cathode component of the cell which can work at an intermediate temperature. [ABSTRACT FROM AUTHOR]