Improved microstructure and sintering temperature of bismuth nano-doped GDC powders synthesized by direct sol-gel combustion

G. Accardo, D. Frattini, H. C. Ham, J. H. Han, S. P. Yoon

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

To improve the microstructural and electrochemical properties of Gadolinium-doped ceria (GDC) electrolytes, materials co-doped ceria with bismuth oxide (1–5 mol%) have been successfully prepared in a one-step sol-gel combustion synthetic route. Sol-gel combustion facilitates molecular mixing of the precursors and substitution of the large Bi3+ cations into the fluorite structure, considerably reducing the sintering temperature. Adding Bi2O3 as a dopant increases the GDC densification to above 99.7% and reduces its traditional sintering temperature by 300 °C. Impedance analyses show that the addition of bismuth enhances the conductivity (3.1∙10−2−1.7∙10−1 S·cm−1 in the temperature range 600–800 °C) and improves the performance of the solid electrolyte in intermediate-temperature solid oxide fuel cells.

Original languageEnglish
Pages (from-to)3800-3809
Number of pages10
JournalCeramics International
Volume44
Issue number4
DOIs
Publication statusPublished - 2018 Mar 1

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Keywords

  • Bismuth
  • Ceramic Electrolyte
  • Electrochemical Impedance
  • Sintering Aids
  • Sintering Temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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