Conductivity properties of lanthanide-co-doped ceria-based solid oxide electrolytes

Arabaci A.

IONICS, vol.25, no.10, pp.4841-4850, 2019 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 10
  • Publication Date: 2019
  • Doi Number: 10.1007/s11581-019-03052-y
  • Journal Name: IONICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4841-4850
  • Keywords: Solid oxide electrolyte, Cerium(IV) oxide, Co-doping, FTIR, SOFC, IONIC-CONDUCTIVITY, ELECTRICAL-PROPERTIES, TEMPERATURE, MICROSTRUCTURE, SM3+, CE0.8SM0.2O1.9, BEHAVIOR, ND3+, GD3+, LA
  • Istanbul University-Cerrahpasa Affiliated: Yes

Abstract

The doped ceria has drawn much attention as a prospective electrolyte material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The ionic conductivity of the ceria-based electrolytes was directly influenced by the valence state and type of the doped ions. Gd3+- and Nd3+-co-doped ceria-based materials (Ce0.80Gd0.2-xNdxO1.90) were prepared using the Pechini method. Co-doped samples were sintered at 1400 degrees C for 6 h. Structures of the samples were studied utilizing X-ray diffraction (XRD) and Fourier transform infrared spectroscopy. XRD patterns showed that all samples have a fluorite-type crystal structure similar to pristine ceria. Electrochemical impedance spectroscopy (EIS) was used to measure the total ionic conductivities of co-doped ceria electrolytes at 300-800 degrees C. EIS results demonstrated that Ce0.80Gd0.12Nd0.08O1.90 had the highest total conductivity at 800 degrees C and the lowest activation energy. It can be deduced that co-doping with suitable rare earth elements can further enhance the electrical properties of ceria-based electrolytes.