Studies on Fe-Co spinel electrodes

被引：16
作者：
Cartaxo, M. A. M.
Ferreira, T. A. S.
Nunes, M. R.
Mendonca, Helena
Pereira, M. L. da Silva
Costa, F. M.
机构：
[1] CCMM, Dept Quim & Bioquim, Fac Ciencias Lisboa, P-1749016 Lisbon, Portugal
[2] Inst Politecn Tomar, Escuela Super Tecnol, Dept Engn Quim & Ambiente, P-2300313 Tomar, Portugal
[3] Univ Evora, Dept Quim, Colegio Luis Verney, P-7000 Evora, Portugal
来源：
SOLID STATE SCIENCES | 2007年 / 9卷 / 08期
关键词：
Co-Fe spinel oxides; x-ray diffraction; cyclic voltammetry; ferrate;
D O I：
10.1016/j.solidstatesciences.2007.05.001
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
FeCO2O4 spinel oxide pelleted electrodes were prepared from the respective powders, obtained by low-temperature coprecipitation method. X-ray diffraction studies suggest the coexistence of two spinel phases, with different a-cell parameters. The samples show semiconductor-type behaviour, in the range 530-340 K. The estimated activation energy for conduction is about 0.7 eV These phases are stable, after being used as electrode materials, as the XRD and SEM/EDS results show. Cyclic voltammetry has been used to investigate the electrochemical behaviour of the FeCO2O4 electrodes in 1 mol dm(-3) KOH aqueous solutions. The voltammetric data allowed finding out the redox reactions occurring at the electrode surface, namely Fe3O4.4H(2)O/Fe(OH)(2) or Fe3O4/Fe2O3 and CoO2/CoOOH by comparing the experimental results with those referred in the literature. (C) 2007 Elsevier Masson SAS. All rights reserved.
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收藏
页码：744 / 749
页数：6
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