Ibrahim A. Amara,b, Abubaker Sharifa and Mohammed M. Ahwidia
Abstract
In this paper two-phase composite electrolyte composed of cerium oxide (CeO2) and ternary
carbonate (Li/Na/K)2CO3) has been prepared by solid-state reaction. The structure and the thermal
stability of CeO2-ternary carbonate (80:20 wt%) composite were characterised by X-ray powder
diffraction (XRD) and simultaneous thermal analysis (STA), respectively.The AC impedance
spectroscopy and four-point DC methods have been employed to investigate the ionic conductivity in
ceria-(Li/Na/K)2CO3 composite electrolyte. The ionic conductivities were carried out in two different
atmospheres (air and wet 5% H2-Ar) within the range of temperature 400-600 ºC. The AC ionic
conductivities of the composite electrolyte were found to be in the range of 3.45 × 10−2 to 0.248 S/cm
and 5.33 × 10−2 to 0.231 S/cm at 400-600 ºC in air and wet 5% H2-Ar, respectively.. Within the
temperature range of 400-600 ºC, the DC ionic of the ceria-carbonate composite were found to be in
the range of 6.87 × 10−2 to 0.152 S/cm and 6.36 × 10−2 to 2.53 × 10−2 S/cm in air and wet 5% H2-Ar
respectively. The composite electrolyte was thermal stable in both oxidising and reducing atmosphere
as indicated by thermal analysis studies.
محمد مسعود | mohammed | 5288