Study on conductivity and redox stability of iron orthovanadate

Peter I Cowin, Rong Lan, Lei Zhang, Christophe TG Petit, Arno Kraft, Shanwen Tao

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    FeVO4 was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO4 and Ag, forming α-AgVO3 and α-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H2/Ar, high electronic conductivity, from 1 S cm−1 at 300 °C to 2 S cm−1 at 700 °C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV2O4 and α-Fe2O3. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO4 nor FeV2O4 are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability.
    Original languageEnglish
    Pages (from-to)614-618
    Number of pages5
    JournalMaterials Chemistry and Physics
    Volume126
    Issue number3
    Early online date1 Feb 2011
    DOIs
    Publication statusPublished - 15 Apr 2011

    Keywords

    • Ceramics
    • Electronic materials
    • Inorganic compounds
    • Oxide
    • Powder diffraction

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