Influence of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria electrolyte for intermediate temperature solid oxide fuel cells

Mustafa Anwar, Muhammed Ali Muhammed, Andanastuti Muchtar, Mahendra Rao Somalu

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Abstract

This study mainly aimed to elucidate the effects of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria (Ce0.8Er0.2O2-δ). Ce1-x-yErxSryO2-δ co-doped electrolytes were synthesized through sol–gel-assisted citric acid–nitrate combustion technique and sintered at 1500 °C for 6 h. X-ray diffraction results confirmed that the sintered electrolytes possessed a cubic fluorite crystal structure. However, a perovskite secondary phase (SrCeO3) was observed in Ce0.8Er0.125Sr0.075O2-δ co-doped composition due to the low solubility limit of strontium (~5 mol%) in ceria. UV–Vis spectroscopy showed that the co-doping of strontium from 0 mol% to 7.5 mol% increased the direct band gap from 3.41 eV to 3.43 eV. The relative densities and the grain size were in the range of 96.02–97.68% and 1.5–3.28 µm, respectively, with increasing the strontium content from 0 mol% to 7.5 mol%. Electrochemical impedance spectroscopy showed that the total resistance of Ce0.8Er0.2O2-δ increased as the strontium content increased. Singly doped Ce0.8Er0.2O2-δ electrolyte exhibited the highest ionic conductivity of 18.22 mS/cm at 700 °C and the lowest activation energy of 0.55 eV within 600–800 °C among all other studied electrolytes.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - 1 Jan 2018

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Erbium
Strontium
Cerium compounds
Solid oxide fuel cells (SOFC)
Electrolytes
Structural properties
Electric properties
Optical properties
Doping (additives)
Temperature
Fluorspar
Ionic conductivity
Electrochemical impedance spectroscopy
Perovskite
Energy gap
Solubility
Activation energy
Crystal structure
Spectroscopy
X ray diffraction

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

@article{b7036ba17a2d4f5f95338c0fe119bb6c,
title = "Influence of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria electrolyte for intermediate temperature solid oxide fuel cells",
abstract = "This study mainly aimed to elucidate the effects of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria (Ce0.8Er0.2O2-δ). Ce1-x-yErxSryO2-δ co-doped electrolytes were synthesized through sol–gel-assisted citric acid–nitrate combustion technique and sintered at 1500 °C for 6 h. X-ray diffraction results confirmed that the sintered electrolytes possessed a cubic fluorite crystal structure. However, a perovskite secondary phase (SrCeO3) was observed in Ce0.8Er0.125Sr0.075O2-δ co-doped composition due to the low solubility limit of strontium (~5 mol{\%}) in ceria. UV–Vis spectroscopy showed that the co-doping of strontium from 0 mol{\%} to 7.5 mol{\%} increased the direct band gap from 3.41 eV to 3.43 eV. The relative densities and the grain size were in the range of 96.02–97.68{\%} and 1.5–3.28 µm, respectively, with increasing the strontium content from 0 mol{\%} to 7.5 mol{\%}. Electrochemical impedance spectroscopy showed that the total resistance of Ce0.8Er0.2O2-δ increased as the strontium content increased. Singly doped Ce0.8Er0.2O2-δ electrolyte exhibited the highest ionic conductivity of 18.22 mS/cm at 700 °C and the lowest activation energy of 0.55 eV within 600–800 °C among all other studied electrolytes.",
keywords = "B: X-ray diffraction, C: Ionic conductivity, C: Optical properties, Co-doping, D: CeO",
author = "Mustafa Anwar and Muhammed, {Muhammed Ali} and Andanastuti Muchtar and Somalu, {Mahendra Rao}",
year = "2018",
month = "1",
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TY - JOUR

T1 - Influence of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria electrolyte for intermediate temperature solid oxide fuel cells

AU - Anwar, Mustafa

AU - Muhammed, Muhammed Ali

AU - Muchtar, Andanastuti

AU - Somalu, Mahendra Rao

PY - 2018/1/1

Y1 - 2018/1/1

N2 - This study mainly aimed to elucidate the effects of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria (Ce0.8Er0.2O2-δ). Ce1-x-yErxSryO2-δ co-doped electrolytes were synthesized through sol–gel-assisted citric acid–nitrate combustion technique and sintered at 1500 °C for 6 h. X-ray diffraction results confirmed that the sintered electrolytes possessed a cubic fluorite crystal structure. However, a perovskite secondary phase (SrCeO3) was observed in Ce0.8Er0.125Sr0.075O2-δ co-doped composition due to the low solubility limit of strontium (~5 mol%) in ceria. UV–Vis spectroscopy showed that the co-doping of strontium from 0 mol% to 7.5 mol% increased the direct band gap from 3.41 eV to 3.43 eV. The relative densities and the grain size were in the range of 96.02–97.68% and 1.5–3.28 µm, respectively, with increasing the strontium content from 0 mol% to 7.5 mol%. Electrochemical impedance spectroscopy showed that the total resistance of Ce0.8Er0.2O2-δ increased as the strontium content increased. Singly doped Ce0.8Er0.2O2-δ electrolyte exhibited the highest ionic conductivity of 18.22 mS/cm at 700 °C and the lowest activation energy of 0.55 eV within 600–800 °C among all other studied electrolytes.

AB - This study mainly aimed to elucidate the effects of strontium co-doping on the structural, optical, and electrical properties of erbium-doped ceria (Ce0.8Er0.2O2-δ). Ce1-x-yErxSryO2-δ co-doped electrolytes were synthesized through sol–gel-assisted citric acid–nitrate combustion technique and sintered at 1500 °C for 6 h. X-ray diffraction results confirmed that the sintered electrolytes possessed a cubic fluorite crystal structure. However, a perovskite secondary phase (SrCeO3) was observed in Ce0.8Er0.125Sr0.075O2-δ co-doped composition due to the low solubility limit of strontium (~5 mol%) in ceria. UV–Vis spectroscopy showed that the co-doping of strontium from 0 mol% to 7.5 mol% increased the direct band gap from 3.41 eV to 3.43 eV. The relative densities and the grain size were in the range of 96.02–97.68% and 1.5–3.28 µm, respectively, with increasing the strontium content from 0 mol% to 7.5 mol%. Electrochemical impedance spectroscopy showed that the total resistance of Ce0.8Er0.2O2-δ increased as the strontium content increased. Singly doped Ce0.8Er0.2O2-δ electrolyte exhibited the highest ionic conductivity of 18.22 mS/cm at 700 °C and the lowest activation energy of 0.55 eV within 600–800 °C among all other studied electrolytes.

KW - B: X-ray diffraction

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KW - C: Optical properties

KW - Co-doping

KW - D: CeO

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JO - Ceramics International

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SN - 0272-8842

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