Combustion synthesis and characterization of Cu-Sm co-doped CeO2 electrolytes

Yingchao Dong*, Stuart Hampshire, Jian er Zhou, Xinfa Dong, Lin Bin, Guangyao Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Nano-sized CSO (Ce0.80Sm0.20O2-δ) and CSCO (Ce0.79Sm0.20Cu0.01 O2-δ) were synthesized by the PVA assisted combustion method, and then characterized by the structure of PVA-cation complexes and nano-powders, as well as mechanical and electrical performance after sintering. The results indicate that the PVA-cation complexes (PVA-(Ce3+,Sm3+) and PVA-(Ce3+,Sm3+,Cu2+)) were formed by coordinating metal cations to hydroxyl groups, as well as the COO-1 group derived from the oxidation of PVA with NO3-1. Low temperatures (around 200°C) caused intense combustion reactions, resulting in the direct crystallization of cubic fluorite nano-CSO (10-20nm) and nano-CSCO (10-15nm) crystals with homogeneous element distribution. This slight compositional modification of CSO by co-doping with 1mol% CuO resulted in a significantly lowered densification temperature, as well as enhanced mechanical and electrical property. The strength improvement can be ascribed to the dense and fine-grained microstructure without normal grain coarsening, resulting in a transgranular-dominant fracture mode during strength testing.

Original languageEnglish (US)
Pages (from-to)2365-2376
Number of pages12
JournalJournal of the European Ceramic Society
Volume31
Issue number13
DOIs
StatePublished - Nov 1 2011

Keywords

  • Ceria electrolyte
  • Co-doping
  • Combustion synthesis
  • Low-temperature sintering
  • Mechanical and electrical properties
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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