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

Christophe TG Petit, Rong Lan, Peter I Cowin, John TS Irvine, Shanwen Tao

    Research output: Contribution to journalArticle

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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 groupPnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) Å 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% H2–Ar with conductivity of Ce1−xCaxVO3 ranging from 1.5 to 13 S cm−1 at 700 °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.
    Original languageEnglish
    Pages (from-to)8854-8861
    Number of pages8
    JournalJournal of Materials Chemistry
    Volume21
    Issue number24
    DOIs
    Publication statusPublished - 16 May 2011

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    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

    Cite this

    Structure, conductivity and redox reversibility of Ca-doped cerium metavanadate. / Petit, Christophe TG ; Lan, Rong; Cowin, Peter I; Irvine, John TS; Tao, Shanwen .

    In: Journal of Materials Chemistry, Vol. 21, No. 24, 16.05.2011, p. 8854-8861.

    Research output: Contribution to journalArticle

    Petit, Christophe TG ; Lan, Rong ; Cowin, Peter I ; Irvine, John TS ; 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 groupPnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) {\AA} 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{\%} H2–Ar with conductivity of Ce1−xCaxVO3 ranging from 1.5 to 13 S cm−1 at 700 °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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    AU - Tao, Shanwen

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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 groupPnma (62) with a = 5.5067 (4), b = 7.7904 (5) and c = 5.4814(7) Å 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% H2–Ar with conductivity of Ce1−xCaxVO3 ranging from 1.5 to 13 S cm−1 at 700 °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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