EFFECT OF GRINDING TIME ONSTRUCTURALTHERMAL AND ELECTRICAL PROPERTES OF STRONTUM-DOPED NANOSTRUCTURALLANTHANUM MANGANTE AS SOFC CATHODE MATERAL

In this work, the strontium-doped lanthanum manganite, a ceramic material used as cathode in solid oxide fuel cells (SOFCs). Currently, the great interest of the researchers to this material has been the study of its characteristics, such as: good chemical and thermal stability, thermal expansion coefficient similar to the electrolyte (yttria stabilized zirconia) and high electrical conductivity. An impression of grinding time on the structural, thermal, and electrical properties of Sr-doped LaMnO, system with Lal-Sr.MnO, (x0.2) stoichiometric ratio was investigated. The nano crystallite LSM powder with cubic structure was prepared by varying the milling time of planetary monomill during the mechanochemical method. XRD diffraction patterns confirmed that increasing milling time affect on LSM phase structure, sintering, thermal, and electrical behavior of LSM. The optimum sintering temperature was determined and then thermal and electrical treatments was investigated with Differential Thermal Analysis (DTA), Thermal Gravimetric Analysis (TGA) and Electrochemical Impedance Spectroscopy (EIS) method respectively. The results of this research certainly indicated that by increasing grinding time as an important factor in LSM mechanochemical synthesis, the nanocrystallite size and distribution as well as thermal and electrical characteristics is modified.

Keywords:

Solid oxide fuel cell , strontium-doped lanthanum manganite , mechanochemicl synthesis , nanocrystallite , phase structure