Voltammetric Investigation of the Oxidation of Iron Powder

Voltammetry measurements were performed on iron powder particles of various size fractions immobilized on the surface of a paraffin-impregnated graphite electrode in electrolytes of various pH values. The course of voltammetric curves implies that the start of the dissolution process is shifted nega...

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Bibliographic Details
Published in:Particulate science and technology 2005-04, Vol.23 (2), p.189-199
Main Authors: Kladeková, Daniela, Gálová, Miriam, Pikna, L'ubomír
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
electrochemical dissolution
Exact sciences and technology
General and physical chemistry
iron
powder particles
Surface physical chemistry
voltammetry
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Summary:Voltammetry measurements were performed on iron powder particles of various size fractions immobilized on the surface of a paraffin-impregnated graphite electrode in electrolytes of various pH values. The course of voltammetric curves implies that the start of the dissolution process is shifted negatively with increasing pH value and the anodic dissolution process of iron is inhibited due to adsorption of products of the electrode reaction on iron particle surfaces. The rate of dissolution is changed also with iron particle size: decreasing dissolution rate and appearance of inhibition were encountered with an increase in particle size. A mechanism was suggested taking into account the influence of both pH of the electrolyte and particle size fraction. Electrochemical dissolution of freshly reduced iron from the solution proceeds at a lower potential than the same process of iron powder immobilized on the electrode.
ISSN:0272-6351
1548-0046
DOI:10.1080/02726350590922260