Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria

Pyeong Seok Cho, Sung Bo Lee, Yoon Ho Cho, Doh Yeon Kim, Hyun Min Park, Jong Heun Lee

Research output: Contribution to journalArticle

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Abstract

This study examines the effect of calcium oxide (CaO) addition to Ce 0.9Gd0.1O1.95 (gadolinia-doped ceria, GDC) containing 500 ppm SiO2 on grain-interior and grain-boundary conduction. The GDC can be used as a solid electrolyte for intermediate and low-temperature solid oxide fuel cells. Doping with ≥2 mol% CaO results in a decrease in apparent grain-boundary resistivity at 300 °C from 746.7 kΩ cm to 2.8-3.5 kΩ cm. The total resistivity exhibits a minimum at 2 mol% CaO. Further increase in CaO concentration to 10 mol% results in an increase in grain-interior resistivity from 3.1 to 40 kΩ cm. Although most of the CaO is incorporated into the GDC lattice, a small amount of CaO scavenges the intergranular siliceous phase, which leads to a significant increase in grain-boundary conduction. The increase in grain-interior resistivity at high CaO concentration is attributed to defect association between Vo and Cace".

Original languageEnglish
Pages (from-to)518-523
Number of pages6
JournalJournal of Power Sources
Volume183
Issue number2
DOIs
Publication statusPublished - 2008 Sep 1

Fingerprint

Gadolinium
Cerium compounds
calcium oxides
gadolinium
Lime
Grain boundaries
grain boundaries
conduction
augmentation
electrical resistivity
Solid electrolytes
solid electrolytes
solid oxide fuel cells
lime
gadolinium oxide
Solid oxide fuel cells (SOFC)
Doping (additives)
Defects
defects

Keywords

  • Calcium oxide
  • Gadolinia-doped ceria (GDC)
  • Grain-boundary conduction
  • Scavenging effect
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry
  • Energy (miscellaneous)

Cite this

Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria. / Cho, Pyeong Seok; Lee, Sung Bo; Cho, Yoon Ho; Kim, Doh Yeon; Park, Hyun Min; Lee, Jong Heun.

In: Journal of Power Sources, Vol. 183, No. 2, 01.09.2008, p. 518-523.

Research output: Contribution to journalArticle

Cho, Pyeong Seok ; Lee, Sung Bo ; Cho, Yoon Ho ; Kim, Doh Yeon ; Park, Hyun Min ; Lee, Jong Heun. / Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria. In: Journal of Power Sources. 2008 ; Vol. 183, No. 2. pp. 518-523.
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