Study on conductivity and redox stability of iron orthovanadate

Peter I. Cowin, Rong Lan, Lei Zhang, Christophe T. G. Petit, Arno Kraft, Shanwen Tao

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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 alpha-AgVO3 and alpha-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H-2/Ar, high electronic conductivity, from 1 S cm(-1) at 300 degrees C to 2 S cm(-1) at 700 degrees 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 alpha-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

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Keywords

  • ceramics
  • electronic materials
  • inorganic compounds
  • oxide
  • powder diffraction
  • oxide fuel cells
  • electrochemical properties
  • electrical conductivity
  • oxidation
  • systen
  • temperature
  • anode
  • performance
  • transition

Cite this

Cowin, P. I., Lan, R., Zhang, L., Petit, C. T. G., Kraft, A., & Tao, S. (2011). Study on conductivity and redox stability of iron orthovanadate. Materials Chemistry and Physics , 126(3), 614-618. https://doi.org/10.1016/j.matchemphys.2011.01.009