Enhanced ionic conductivity in a composite electrolyte based on cerium oxide-ternary carbonate
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cerium oxide, composite effect, composite electrolyte, ionic conductivity, ternary carbonate.
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.
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