Electrosynthesis of cobalt (III) ions in concentrated H3PO4 medium
Identifieur interne : 000159 ( Istex/Curation ); précédent : 000158; suivant : 000160Electrosynthesis of cobalt (III) ions in concentrated H3PO4 medium
Auteurs : A. El Ghazali [Maroc] ; S. Belcadi [Maroc] ; J. J. Rameau [France]Source :
- Journal of Applied Electrochemistry [ 0021-891X ] ; 1988-01-01.
Abstract
Abstract: The electrosynthesis of cobalt(III) ions from cobalt(II) ions has been studied in 29, 57 and 85 wt % H3PO4 solutions. It has been shown that the conversion of Co(II) to Co(III) is limited by the chemical reaction between Co(III) ions and water. A kinetic study demonstrated that this reaction becomes more rapid as the Co(III) ion concentration increases. In order to find the best conditions for the electrolysis, the effect of some experimental parameters on the current yield and the chemical efficiency has been examined. A comparison between gold and platinum anodes has also been made. The following conditions were found to be the best: anode material, gold; initial Co(II) ion concentration, 5×10−3 M; solvent, 85 wt % H3PO4 solution; current density, 1 mA cm−2; temperature, 20–30° C. Under these conditions the maximum value of current yield, and chemical efficiency are 66% and 48% respectively.
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DOI: 10.1007/BF01016201
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It has been shown that the conversion of Co(II) to Co(III) is limited by the chemical reaction between Co(III) ions and water. A kinetic study demonstrated that this reaction becomes more rapid as the Co(III) ion concentration increases. In order to find the best conditions for the electrolysis, the effect of some experimental parameters on the current yield and the chemical efficiency has been examined. A comparison between gold and platinum anodes has also been made. The following conditions were found to be the best: anode material, gold; initial Co(II) ion concentration, 5×10−3 M; solvent, 85 wt % H3PO4 solution; current density, 1 mA cm−2; temperature, 20–30° C. Under these conditions the maximum value of current yield, and chemical efficiency are 66% and 48% respectively.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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