Electrosynthesis of cobalt (III) ions in concentrated H3PO4 medium
Identifieur interne : 000259 ( Maroc/Analysis ); précédent : 000258; suivant : 000260Electrosynthesis 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.
Descripteurs français
- Pascal (Inist)
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English descriptors
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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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ISTEX:1312A49158391978F3902AE95FB2391A6801A5CFLe document en format XML
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Rameau</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Centre de Recherche en Electrochimie Minérale et Génie des Procédés, CNRS-UA 1212, ENSEEG 38402, Saint-Martin d'Hères</wicri:regionArea><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Saint-Martin d'Hères</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Applied Electrochemistry</title><title level="j" type="abbrev">J Appl Electrochem</title><idno type="ISSN">0021-891X</idno><idno type="eISSN">1572-8838</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1988-01-01">1988-01-01</date><biblScope unit="volume">18</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="27">27</biblScope><biblScope unit="page" to="31">31</biblScope></imprint><idno type="ISSN">0021-891X</idno></series><idno type="istex">1312A49158391978F3902AE95FB2391A6801A5CF</idno><idno type="DOI">10.1007/BF01016201</idno><idno type="ArticleID">BF01016201</idno><idno type="ArticleID">Art4</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-891X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acidic solution</term><term>Aqueous solution</term><term>Chronopotentiometry</term><term>Cobalt II Ions</term><term>Divalent metal Compounds</term><term>Electrochemical reaction</term><term>Electrodes</term><term>Electrolysis</term><term>Gold</term><term>Kinetics</term><term>Oxidation</term><term>Platinum</term><term>Transition metal</term><term>Transition metal Compounds</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Chronopotentiométrie</term><term>Cinétique</term><term>Cobalt II Ion</term><term>Electrode</term><term>Electrolyse</term><term>Métal divalent Composé</term><term>Métal transition</term><term>Métal transition Composé</term><term>Or</term><term>Oxydation</term><term>Phosphorique acide</term><term>Platine</term><term>Réaction électrochimique</term><term>Solution acide</term><term>Solution aqueuse</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Or</term><term>Platine</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rabat-Salé-Kénitra</li><li>Rhône-Alpes</li></region><settlement><li>Rabat</li><li>Saint-Martin d'Hères</li></settlement></list><tree><country name="Maroc"><region name="Rabat-Salé-Kénitra"><name sortKey="El Ghazali, A" sort="El Ghazali, A" uniqKey="El Ghazali A" first="A." last="El Ghazali">A. El Ghazali</name></region><name sortKey="Belcadi, S" sort="Belcadi, S" uniqKey="Belcadi S" first="S." last="Belcadi">S. Belcadi</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Rameau, J J" sort="Rameau, J J" uniqKey="Rameau J" first="J. J." last="Rameau">J. J. Rameau</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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