Study on conductivity and redox stability of iron orthovanadate

被引：17

作者：

Cowin, Peter I. ^{[2
]}

Lan, Rong ^{[2
]}

Zhang, Lei ^{[2
]}

Petit, Christophe T. G. ^{[2
]}

Kraft, Arno ^{[2
]}

Tao, Shanwen ^{[1
,2
]}

机构：

[1] Univ Strathclyde, Dept Chem & Proc Engn, Glasgow G1 1XJ, Lanark, Scotland

[2] Heriot Watt Univ, Dept Chem, Edinburgh EH14 4AS, Midlothian, Scotland

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2011年 / 126卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

Ceramics; Electronic materials; Inorganic compounds; Oxide; Powder diffraction; ELECTROCHEMICAL PROPERTIES; ELECTRICAL-CONDUCTIVITY; FEVO4; ANODE; TEMPERATURE; PERFORMANCE; REACTIVITY; TRANSITION; OXIDATION; OXIDES;

D O I：

10.1016/j.matchemphys.2011.01.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：614 / 618

页数：5

共 30 条

[1] Effect of Cu substitution on conductivity of Ni-Al ferrite [J].

Ata-Allah, SS ;

Fayek, MK .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2000, 61 (09) :1529-1534

[2] Reactivity of FeVO4 towards selected molybdates(VI) of divalent transition metals [J].

Bosacka, M. ;

Worstynowicz, A. ;

Kaczmarek, S. M. ;

Jakubus, P. .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2007, 68 (5-6) :1184-1192

[3] FeVO4 as a highly active heterogeneous Fenton-like catalyst towards the degradation of Orange II [J].

Deng, Jingheng ;

Jiang, Jingyuan ;

Zhang, Yuanyuan ;

Lin, Xiaoping ;

Du, Changming ;

Xiong, Ya .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2008, 84 (3-4) :468-473

[4] Synthesis and electrochemical properties of numerous classes of vanadates [J].

Denis, S ;

Baudrin, E ;

Orsini, F ;

Ouvrard, G ;

Touboul, M ;

Tarascon, JM .

JOURNAL OF POWER SOURCES, 1999, 81 :79-84

[5]

FOTIEV AA, 1983, ZH NEORG KHIM+, V28, P988

[6] STUDIES ON THE ELECTRICAL-PROPERTIES OF VANADIUM IRON SPINELS AT STOICHIOMETRY AND AT OXIDATIVE NONSTOICHIOMETRY [J].

GILLOT, B ;

NOHAIR, M .

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1995, 148 (01) :239-250

[7]

GOODENOUGH JB, 1971, ANNU REV MATER SCI, V15, P101

[8] SOFC anodes for direct oxidation of hydrogen and methane fuels containing H2S [J].

Grgicak, Catherine M. ;

Green, Richard G. ;

Giorgi, Javier B. .

JOURNAL OF POWER SOURCES, 2008, 179 (01) :317-328

[9] ELECTRICAL-CONDUCTIVITY IN THE ANTIFERROMAGNETIC COMPOUNDS FEVO4, FEVMOO7 AND FE4V2MO3O20 [J].

GRON, T ;

KROKKOWALSKI, J ;

KURZAWA, M ;

WALCZAK, J .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1991, 101 (1-3) :148-150

[10] Stability and performance of supported Fe-V-oxide catalysts in methanol oxidation [J].

Haggblad, Robert ;

Massa, Mariano ;

Andersson, Arne .

JOURNAL OF CATALYSIS, 2009, 266 (02) :218-227

← 1 2 3 →