Structure, conductivity and redox reversibility of Ca-doped cerium metavanadate

Christophe T. G. Petit, Rong Lan, Peter I. Cowin, John T. S. Irvine, Shanwen Tao

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A-site substituted cerium metavanadates, Ce1-xCaxVO3, were synthesised by solid-state reactions from single-phase powders of the corresponding orthovanadates. All metavanadate samples were found to exhibit either an orthorhombic and/or monoclinic phase of space group Pnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) angstrom for Ce0.8Ca0.2VO3. X-Ray diffraction patterns and thermal analyses have shown that the reduction of Ca-doped CeVO3 from the equivalent orthovanadate is redox phase reversible without formation of parasitic phases at x = 0.2, 0.3. Conductivity measurements were performed in air and in dry 5% H-2-Ar with conductivity of Ce1-xCaxVO3 ranging from 1.5 to 13 S cm(-1) at 700 degrees C in a reducing atmosphere. Sample Ce0.7Ca0.3VO3 exhibits the highest conductivity in a reducing atmosphere in all the measured samples which could be a potential anode or as a part of composite anode for SOFCs. The conductivity of Ce0.7Ca0.3VO3 is higher than that for Ce0.85Sr0.15VO3 which could be related to the higher doping level.

LanguageEnglish
Pages8854-8861
Number of pages8
JournalJournal of Materials Chemistry
Volume21
Issue number24
Early online date16 May 2011
DOIs
Publication statusPublished - 28 Jun 2011

Fingerprint

Cerium
Vanadates
Anodes
Solid oxide fuel cells (SOFC)
Solid state reactions
Diffraction patterns
Doping (additives)
Powders
X ray diffraction
Composite materials
Air
Oxidation-Reduction
Hot Temperature

Keywords

  • oxide fuel cells
  • transport properties
  • anode materials
  • stability
  • perovskites
  • CEVO4
  • SR
  • crystal
  • SOFC
  • PR

Cite this

Petit, C. T. G., Lan, R., Cowin, P. I., Irvine, J. T. S., & Tao, S. (2011). Structure, conductivity and redox reversibility of Ca-doped cerium metavanadate. Journal of Materials Chemistry, 21(24), 8854-8861. https://doi.org/10.1039/c1jm10960j
Petit, Christophe T. G. ; Lan, Rong ; Cowin, Peter I. ; Irvine, John T. S. ; Tao, Shanwen. / Structure, conductivity and redox reversibility of Ca-doped cerium metavanadate. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 24. pp. 8854-8861.
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abstract = "A-site substituted cerium metavanadates, Ce1-xCaxVO3, were synthesised by solid-state reactions from single-phase powders of the corresponding orthovanadates. All metavanadate samples were found to exhibit either an orthorhombic and/or monoclinic phase of space group Pnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) angstrom for Ce0.8Ca0.2VO3. X-Ray diffraction patterns and thermal analyses have shown that the reduction of Ca-doped CeVO3 from the equivalent orthovanadate is redox phase reversible without formation of parasitic phases at x = 0.2, 0.3. Conductivity measurements were performed in air and in dry 5{\%} H-2-Ar with conductivity of Ce1-xCaxVO3 ranging from 1.5 to 13 S cm(-1) at 700 degrees C in a reducing atmosphere. Sample Ce0.7Ca0.3VO3 exhibits the highest conductivity in a reducing atmosphere in all the measured samples which could be a potential anode or as a part of composite anode for SOFCs. The conductivity of Ce0.7Ca0.3VO3 is higher than that for Ce0.85Sr0.15VO3 which could be related to the higher doping level.",
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Structure, conductivity and redox reversibility of Ca-doped cerium metavanadate. / Petit, Christophe T. G.; Lan, Rong; Cowin, Peter I.; Irvine, John T. S.; Tao, Shanwen.

In: Journal of Materials Chemistry, Vol. 21, No. 24, 28.06.2011, p. 8854-8861.

Research output: Contribution to journalArticle

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AB - A-site substituted cerium metavanadates, Ce1-xCaxVO3, were synthesised by solid-state reactions from single-phase powders of the corresponding orthovanadates. All metavanadate samples were found to exhibit either an orthorhombic and/or monoclinic phase of space group Pnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) angstrom for Ce0.8Ca0.2VO3. X-Ray diffraction patterns and thermal analyses have shown that the reduction of Ca-doped CeVO3 from the equivalent orthovanadate is redox phase reversible without formation of parasitic phases at x = 0.2, 0.3. Conductivity measurements were performed in air and in dry 5% H-2-Ar with conductivity of Ce1-xCaxVO3 ranging from 1.5 to 13 S cm(-1) at 700 degrees C in a reducing atmosphere. Sample Ce0.7Ca0.3VO3 exhibits the highest conductivity in a reducing atmosphere in all the measured samples which could be a potential anode or as a part of composite anode for SOFCs. The conductivity of Ce0.7Ca0.3VO3 is higher than that for Ce0.85Sr0.15VO3 which could be related to the higher doping level.

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