Study on conductivity and redox stability of iron orthovanadate

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

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

FeVO(4) was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO(4) and Ag, forming alpha-AgVO(3) and alpha-Fe(2)O(3) at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO(4) 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 FeV(2)O(4) and alpha-Fe(2)O(3). It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO(4) nor FeV(2)O(4) 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
DOIs
Publication statusPublished - 2011
Externally publishedYes

Cite this