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Journal of Materials Science

, Volume 20, Issue 9, pp 3289–3299 | Cite as

Some advantages of carbon paste electrodes in the morphological study of finely divided iron oxides

  • M. T. Mouhandess
  • F. Chassagneux
  • B. Durand
  • Z. Z. Sharara
  • O. Vittori
Papers

Abstract

The electroreduction of finely divided trivalent iron oxides using a carbon paste electrode occurs according to a mechanism involving the dissolution of the solid and then the reduction of solvated Fe3+ ions into Fe2+ ions. The voltammetric curves exhibit two peaks. The first is due to the reduction of Fe3+ ions that come from dissolution of the smallest particles at the beginning of the experiment. The second is characteristic of reduction of the solid; its shape, position and amplitude are influenced by morphology. Theoretical aspects are considered. It appears that the use of a carbon paste electrode for the study of divided solids containing an electroreactive ion can easily give information either on the particle size distribution, if the dissolution kinetics of the compound are known, or on the dissolution kinetics of monodisperse solids or solids whose particle size distribution is well defined.

Keywords

Ferrite Haematite Electrochemical Reduction Dissolution Kinetic Zinc Ferrite 

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Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • M. T. Mouhandess
    • 1
  • F. Chassagneux
    • 1
  • B. Durand
    • 1
  • Z. Z. Sharara
    • 2
  • O. Vittori
    • 2
  1. 1.Laboratoire de Chimie Minérale IIIUniversité Claude Bernard Lyon IVilleurbanne CedexFrance
  2. 2.Laboratoire de Chimie Analytique IIIUniversité Claude Bernard Lyon IVilleurbanne CedexFrance

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