PVA-assisted synthesis and characterization of nano-crystalline La3+ and Mg2+ co-doped CeO2 electrolyte for intermediate-temperature solid oxide fuel cells

Chengcheng Wang, Linghong Luo*, Yefan Wu, Yingchao Dong, Yonghong Chen, Jijun Shi, Liang Cheng, Lin Bin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A series of nano-crystalline ceria-based solid solution electrolyte, Ce0. 8La0. 2-xMgxO2-δ (x = 0. 0, 0. 05, 0. 10, 0. 15, and 0. 2), were synthesized via the polyvinyl alcohol (PVA) assisted combustion method, and then characterized to the crystalline structure, powder morphology, sintering micro-structure, and electrical properties. Present study showed that Ce0. 8La0. 2-xMgxO2-δ was exceedingly stable as a cubic phase in all temperature range and exhibited fine crystals ranging from 15 to 20 nm. After sintering at 1,400 °C, the as-prepared pellets exhibited a dense micro-structure with 96 % of theoretical density. The electrical conductivity was studied using AC impedance spectroscopy and it was observed that the composition Ce0. 8La0. 1 Mg0. 1O2-δ showed higher electrical conductivity of 0. 020 S cm-1 at 700 °C. The thermal expansion was measured using dilatometer technique in the temperature range 30-1,000 °C. The average thermal expansion coefficient of Ce0. 8La0. 1 Mg0. 1O2-δ was 12. 37 × 10-6 K-1, which was higher than that of the commonly used SOFC electrolyte YSZ (~10. 8 × 10-6 K-1).

Original languageEnglish (US)
Pages (from-to)343-349
Number of pages7
JournalIonics
Volume19
Issue number2
DOIs
StatePublished - Jan 1 2013

Keywords

  • Electrical conductivity
  • Electrolyte
  • Intermediate-temperature solid oxide fuel cells
  • La-Mg co-doped ceria
  • PVA-assisted synthesis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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