Study on conductivity and redox stability of iron orthovanadate

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

doi:10.1016/j.matchemphys.2011.01.009

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 journal › Article › Research › peer-review

20 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 language	English
Pages (from-to)	614 - 618
Number of pages	5
Journal	Materials Chemistry and Physics
Volume	126
Issue number	3
DOIs	https://doi.org/10.1016/j.matchemphys.2011.01.009
Publication status	Published - 2011
Externally published	Yes

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10.1016/j.matchemphys.2011.01.009

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title = "Study on conductivity and redox stability of iron orthovanadate",

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.",

author = "Cowin, \{Peter Ian\} and Rong Lan and Lei Zhang and Petit, \{Christophe TG\} and Arno Kraft and Shanwen Tao",

year = "2011",

doi = "10.1016/j.matchemphys.2011.01.009",

language = "English",

volume = "126",

pages = "614 -- 618",

journal = "Materials Chemistry and Physics",

issn = "0254-0584",

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number = "3",

}

TY - JOUR

T1 - Study on conductivity and redox stability of iron orthovanadate

AU - Cowin, Peter Ian

AU - Lan, Rong

AU - Zhang, Lei

AU - Petit, Christophe TG

AU - Kraft, Arno

AU - Tao, Shanwen

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

UR - http://goo.gl/obXa4u

U2 - 10.1016/j.matchemphys.2011.01.009

DO - 10.1016/j.matchemphys.2011.01.009

M3 - Article

SN - 0254-0584

VL - 126

SP - 614

EP - 618

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 3

ER -

Study on conductivity and redox stability of iron orthovanadate

Abstract

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