Electrical conductivity of dense nanocrystalline ceria under humidified atmosphere

Hitoshi Takamura, Naomi Takahashi

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

This paper describes the water adsorption behavior and electrical conductivity of Sm-doped ceria nanoparticles under humidified atmosphere. Single nano-sized 6 mol% Sm-doped ceria was prepared by either homogeneous precipitation using hexamethylenetetramine (HMTA) or ultraviolet (UV) laser irradiation. For the ceria nanoparticles prepared by HMTA, weakly-bundled agglomerates with pores were formed; as a result, approximately 3 mass% of water adsorption and capillary condensation were observed at room temperature. On the other hand, those prepared by UV laser irradiation formed tightly-bundled agglomerates without such pores; only 0.12 mass% of water was adsorbed under the same condition. For electrical conductivity measurements, dense samples having a relative density of 85 to 93% were prepared at 300 °C under 6 GPa by using a high-pressure apparatus. The proton conductivity of dense nanocrystalline ceria was on the order of 10- 7 to 10- 8 S/cm at around 50 °C under humidified atmosphere. As temperature increased, the proton conductivity decreased.

Original languageEnglish
Pages (from-to)100-103
Number of pages4
JournalSolid State Ionics
Volume181
Issue number3-4
DOIs
Publication statusPublished - 2010 Feb 24

Keywords

  • Ceria
  • Nanoparticles
  • Proton conductivity
  • UV laser irradiation
  • Water adsorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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