Structural, optical and electrical properties of Ce0.8Sm0.2- xErxO2-δ (x = 0–0.2) Co-doped ceria electrolytes

Mustafa Anwar, Muhammed Ali Muhammed, Nurul Akidah Baharuddin, Nor Fatina Raduwan, Andanastuti Muchtar, Mahendra Rao Somalu

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This study examined the effects of samarium and erbium co-doping on the structural, optical, and electrical properties of ceria (CeO2). Ceramic (Ce0.8Sm0 .2-xErxO2-δ; x = 0, 0.05, 0.10, 0.15, 0.20) electrolytes were synthesized via sol-gel assisted citric acid–nitrate combustion and calcined at 850 °C for 5 h. The calcined electrolytes possessed a cubic fluorite crystal structure without impure phases. The direct band gap of the calcined electrolytes increased as the erbium content increased and the lowest band gap was obtained for Ce0.8Sm0.2O2-δ (SDC) electrolyte. The calcined electrolyte powders were subsequently pressed into cylindrical pellets by uniaxial die pressing, and the pellets were sintered at 1400 °C for 5 h. The sintered densities of the pellets were measured with Archimedes’ method. The relative density of Ce0.8Sm0.1Er0.1O2- δ co-doped ceria electrolyte was higher than those of singly doped ones, and these findings were further confirmed through field emission scanning electron microscopy. Electrochemical impedance spectroscopy indicated that the conductivity of erbium-doped ceria increased as the samarium content increased. The maximum total ionic conductivity was observed in Ce0.8Sm0.1Er0.1O2- δ co-doped electrolyte. However, the singly doped SDC electrolyte exhibited the highest ionic conductivity of 13.12 mS/cm and the lowest activation energy of 0.580 eV at 600 °C among all other Ce0.8Sm0 .2-xErxO2-δ co-doped ceria electrolytes.

Original languageEnglish
Pages (from-to)13639-13648
Number of pages10
JournalCeramics International
Volume44
Issue number12
DOIs
Publication statusPublished - 15 Aug 2018

Fingerprint

Cerium compounds
Electrolytes
Structural properties
Electric properties
Optical properties
Erbium
Samarium
Ionic conductivity
Energy gap
Fluorspar
Electrochemical impedance spectroscopy
Field emission
Powders
Sol-gels
Activation energy
Crystal structure
Doping (additives)
Scanning electron microscopy

Keywords

  • B: X-ray diffraction
  • C: Ionic conductivity
  • C: Optical Properties
  • Co-doping
  • D: CeO

ASJC Scopus subject areas

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

Cite this

Structural, optical and electrical properties of Ce0.8Sm0.2- xErxO2-δ (x = 0–0.2) Co-doped ceria electrolytes. / Anwar, Mustafa; Muhammed, Muhammed Ali; Baharuddin, Nurul Akidah; Raduwan, Nor Fatina; Muchtar, Andanastuti; Somalu, Mahendra Rao.

In: Ceramics International, Vol. 44, No. 12, 15.08.2018, p. 13639-13648.

Research output: Contribution to journalArticle

Anwar, Mustafa ; Muhammed, Muhammed Ali ; Baharuddin, Nurul Akidah ; Raduwan, Nor Fatina ; Muchtar, Andanastuti ; Somalu, Mahendra Rao. / Structural, optical and electrical properties of Ce0.8Sm0.2- xErxO2-δ (x = 0–0.2) Co-doped ceria electrolytes. In: Ceramics International. 2018 ; Vol. 44, No. 12. pp. 13639-13648.
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AU - Anwar, Mustafa

AU - Muhammed, Muhammed Ali

AU - Baharuddin, Nurul Akidah

AU - Raduwan, Nor Fatina

AU - Muchtar, Andanastuti

AU - Somalu, Mahendra Rao

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AB - This study examined the effects of samarium and erbium co-doping on the structural, optical, and electrical properties of ceria (CeO2). Ceramic (Ce0.8Sm0 .2-xErxO2-δ; x = 0, 0.05, 0.10, 0.15, 0.20) electrolytes were synthesized via sol-gel assisted citric acid–nitrate combustion and calcined at 850 °C for 5 h. The calcined electrolytes possessed a cubic fluorite crystal structure without impure phases. The direct band gap of the calcined electrolytes increased as the erbium content increased and the lowest band gap was obtained for Ce0.8Sm0.2O2-δ (SDC) electrolyte. The calcined electrolyte powders were subsequently pressed into cylindrical pellets by uniaxial die pressing, and the pellets were sintered at 1400 °C for 5 h. The sintered densities of the pellets were measured with Archimedes’ method. The relative density of Ce0.8Sm0.1Er0.1O2- δ co-doped ceria electrolyte was higher than those of singly doped ones, and these findings were further confirmed through field emission scanning electron microscopy. Electrochemical impedance spectroscopy indicated that the conductivity of erbium-doped ceria increased as the samarium content increased. The maximum total ionic conductivity was observed in Ce0.8Sm0.1Er0.1O2- δ co-doped electrolyte. However, the singly doped SDC electrolyte exhibited the highest ionic conductivity of 13.12 mS/cm and the lowest activation energy of 0.580 eV at 600 °C among all other Ce0.8Sm0 .2-xErxO2-δ co-doped ceria electrolytes.

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KW - C: Ionic conductivity

KW - C: Optical Properties

KW - Co-doping

KW - D: CeO

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