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

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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.

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Authors and Affiliations

  1. Laboratoire de Chimie Minérale III, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne Cedex, France

    M. T. Mouhandess, F. Chassagneux & B. Durand

  2. Laboratoire de Chimie Analytique III, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne Cedex, France

    Z. Z. Sharara & O. Vittori

Authors
  1. M. T. Mouhandess
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  2. F. Chassagneux
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  3. B. Durand
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  4. Z. Z. Sharara
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  5. O. Vittori
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Mouhandess, M.T., Chassagneux, F., Durand, B. et al. Some advantages of carbon paste electrodes in the morphological study of finely divided iron oxides. J Mater Sci 20, 3289–3299 (1985). https://doi.org/10.1007/BF00545197

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