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Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium

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Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium. / Coles-Aldridge, Alice V.; Baker, Richard T.

In: Solid State Ionics, Vol. 347, 115255, 04.2020.

Research output: Contribution to journalArticlepeer-review

Harvard

Coles-Aldridge, AV & Baker, RT 2020, 'Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium', Solid State Ionics, vol. 347, 115255. https://doi.org/10.1016/j.ssi.2020.115255

APA

Coles-Aldridge, A. V., & Baker, R. T. (2020). Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium. Solid State Ionics, 347, [115255]. https://doi.org/10.1016/j.ssi.2020.115255

Vancouver

Coles-Aldridge AV, Baker RT. Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium. Solid State Ionics. 2020 Apr;347. 115255. https://doi.org/10.1016/j.ssi.2020.115255

Author

Coles-Aldridge, Alice V. ; Baker, Richard T. / Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium. In: Solid State Ionics. 2020 ; Vol. 347.

Bibtex - Download

@article{30683dcc79914cd4b10cc7bf6f9879a8,
title = "Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium",
abstract = "In a systematic study, two compositional series of ceria-based oxides, both co-doped with Sm and Gd, were synthesised using a low temperature method and evaluated as oxygen ion-conducting electrolytes for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Series one, Ce1-2xSmxGdxO2-x, had equal concentrations of Sm and Gd but varying total dopant concentration. Series two, Ce0.825SmxGd0.175-xO1.9125, had a fixed total dopant concentration but the Sm:Gd concentration ratio was varied. The materials were characterised using scanning and transmission electron microscopy, inductively coupled plasma mass spectrometry and X-ray diffraction. Impedance spectra were recorded on dense pellets of these materials. From these, total, bulk and grain boundary conductivities and capacitances along with activation energies, pre-exponential constants and enthalpies of ion migration and defect association were obtained. These gave a detailed insight into the fundamental conduction processes in the materials. Ce0.825Sm0.0875Gd0.0875O1.9125 had the highest total ionic conductivity at temperatures of 550 °C and above and also demonstrated an enhanced conductivity with respect to its singly-doped parent compounds, Ce0.825Sm0.175O1.9125 and Ce0.825Gd0.175O1.9125, at 400 °C and above. This compares favourably with previously-reported values and has promising implications for the development of IT-SOFCs.",
keywords = "Activation energy, Ceria, Doping, Electrolyte, Ionic conductivity, Solid oxide fuel cell",
author = "Coles-Aldridge, {Alice V.} and Baker, {Richard T.}",
note = "The authors thank the University of St Andrews and the UK Engineering and Physical Sciences Research Council for the PhD studentship for AVC-A (grant code: EP/M506631/1). Electron microscopy was performed at the Electron Microscope Facility, University of St Andrews.",
year = "2020",
month = apr,
doi = "10.1016/j.ssi.2020.115255",
language = "English",
volume = "347",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Oxygen ion conductivity in ceria-based electrolytes co-doped with samarium and gadolinium

AU - Coles-Aldridge, Alice V.

AU - Baker, Richard T.

N1 - The authors thank the University of St Andrews and the UK Engineering and Physical Sciences Research Council for the PhD studentship for AVC-A (grant code: EP/M506631/1). Electron microscopy was performed at the Electron Microscope Facility, University of St Andrews.

PY - 2020/4

Y1 - 2020/4

N2 - In a systematic study, two compositional series of ceria-based oxides, both co-doped with Sm and Gd, were synthesised using a low temperature method and evaluated as oxygen ion-conducting electrolytes for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Series one, Ce1-2xSmxGdxO2-x, had equal concentrations of Sm and Gd but varying total dopant concentration. Series two, Ce0.825SmxGd0.175-xO1.9125, had a fixed total dopant concentration but the Sm:Gd concentration ratio was varied. The materials were characterised using scanning and transmission electron microscopy, inductively coupled plasma mass spectrometry and X-ray diffraction. Impedance spectra were recorded on dense pellets of these materials. From these, total, bulk and grain boundary conductivities and capacitances along with activation energies, pre-exponential constants and enthalpies of ion migration and defect association were obtained. These gave a detailed insight into the fundamental conduction processes in the materials. Ce0.825Sm0.0875Gd0.0875O1.9125 had the highest total ionic conductivity at temperatures of 550 °C and above and also demonstrated an enhanced conductivity with respect to its singly-doped parent compounds, Ce0.825Sm0.175O1.9125 and Ce0.825Gd0.175O1.9125, at 400 °C and above. This compares favourably with previously-reported values and has promising implications for the development of IT-SOFCs.

AB - In a systematic study, two compositional series of ceria-based oxides, both co-doped with Sm and Gd, were synthesised using a low temperature method and evaluated as oxygen ion-conducting electrolytes for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs). Series one, Ce1-2xSmxGdxO2-x, had equal concentrations of Sm and Gd but varying total dopant concentration. Series two, Ce0.825SmxGd0.175-xO1.9125, had a fixed total dopant concentration but the Sm:Gd concentration ratio was varied. The materials were characterised using scanning and transmission electron microscopy, inductively coupled plasma mass spectrometry and X-ray diffraction. Impedance spectra were recorded on dense pellets of these materials. From these, total, bulk and grain boundary conductivities and capacitances along with activation energies, pre-exponential constants and enthalpies of ion migration and defect association were obtained. These gave a detailed insight into the fundamental conduction processes in the materials. Ce0.825Sm0.0875Gd0.0875O1.9125 had the highest total ionic conductivity at temperatures of 550 °C and above and also demonstrated an enhanced conductivity with respect to its singly-doped parent compounds, Ce0.825Sm0.175O1.9125 and Ce0.825Gd0.175O1.9125, at 400 °C and above. This compares favourably with previously-reported values and has promising implications for the development of IT-SOFCs.

KW - Activation energy

KW - Ceria

KW - Doping

KW - Electrolyte

KW - Ionic conductivity

KW - Solid oxide fuel cell

U2 - 10.1016/j.ssi.2020.115255

DO - 10.1016/j.ssi.2020.115255

M3 - Article

AN - SCOPUS:85079293394

VL - 347

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

M1 - 115255

ER -

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