Studi Pengaruh Co-doping Neodymium (Nd) Terhadap Sifat Fisik Elektrolit Ce0.9Gd1-xNdxO2-z dengan Metode Sol-Gel untuk Aplikasi IT-SOFC

Abstract

Neodymium and Gadolinium co-doped ceria (Ce0.9Gd1-xNdxO2-z) is a promising alternative as a solid
electrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC) due to its low operating temperature
and its high electrical conductivity. Ce0.9Gd1-xNdxO2-z powders, with x=0.25, 0.50 and 0.75mol% of
neodymium were successfully syhnthesized with a sol-gel method and citric acid as an organic precursor.
The samples were calcined at temperature of 750oC for 5 hours. The powders properties were then
characterized by X-ray diffraction, scanning electron microscopy, thermal gravimetry analysis, and the
sintered pellets were evaluated by Archimedes method for calculate the density. Sintered Ce0.9Gd1-xNdxO2-z
samples exhibited the maximum theorical density of 97% which is suitable for solid electrolytes. The
Ce0.9Gd1-xNdxO2-z powders consist of face-centered cubic fluorite ceria structure confirmed with x-ray
diffraction (XRD). methodology investigated showed a better control of stoichiometry, impurities, and low
cost.