Electrochemical and thermal characterization of doped ceria electrolyte with lanthanum and zirconium

Research output: Contribution to journalArticle

Authors

  • Asia Rafique
  • Rizwan Raza
  • Nor Arifin
  • M. Kaleem Ullah
  • Amjad Ali

Colleges, School and Institutes

External organisations

  • Department of Physics, COMSATS Institute of Information Technology
  • Higher Education Department, Government of Punjab

Abstract

Nanocomposites electrolytes consisting of La⁠3+ and Zr⁠4+ doped with ceria labelled as La⁠0.2 Ce⁠0.8 O⁠2-δ (LDC), Zr⁠0.2Ce⁠0.8O⁠2-δ (ZDC) and Zr⁠0.2La⁠0.2Ce⁠0.6O⁠2-δ (ZLDC) have been synthesized via a co-precipitation route. DC conductivity was studied with a four-probe method in the range of temperature 450–650 °C and maximum conductivity was found to be 0.81 × 10⁠−2 S.cm⁠−1 (LDC) > 0.32 × 10⁠−2 S.cm⁠−1 (ZLDC) > 0.15 × 10⁠−2 S.cm⁠−1 (ZDC) at a temperature of 650 °C, respectively. Further, electric behavior of doped and co-doped ceria electrolytes was investigated by A.C electrochemical impedance spectroscopy (frequency range ~ 0.1 Hz 4 MHz). The phase/ structural identification of the material prepared was studied using X-ray diffraction and found ceria to possess a cubic fluorite structure. Scanning electron microscopy (SEM) was carried out to study its morphology and particle size (~ 90–120 nm). Thermal behavior on its change in weight and length with the temperature were studied by thermogravimetric analysis (TGA) and dilatometry respectively. Furthermore, thermal expansion coefficients (TECs) of prepared electrolytes are calculated and found as follows: 13.4 × 10⁠−6 °C⁠−1, 13.6 × 10⁠−6 °C⁠−1and ⁠5.3 × 10⁠−6 °C⁠−1 for LDC, ZDC and ZLDC, respectively, in the temperature range 150–1150 °C.

Details

Original languageEnglish
Pages (from-to)6493-6499
JournalCeramics International
Volume44
Issue number6
Early online date9 Jan 2018
Publication statusPublished - 15 Apr 2018

Keywords

  • doped ceria , co-doped ceria , electrolyte , lanthanum , zirconium , ionic conductivity , thermal expansion coefficient