Electroreduction of Ni2+ and Fe2+ in a fused electrolyte
Identifieur interne : 000585 ( France/Analysis ); précédent : 000584; suivant : 000586Electroreduction of Ni2+ and Fe2+ in a fused electrolyte
Auteurs : Frédéric Lantelme [France] ; Ahmed Derja [France] ; Naoaki Kumagai [France]Source :
- Journal of Electroanalytical Chemistry [ 0022-0728 ] ; 1988.
Abstract
It is shown that the simultaneous electroreduction of Ni2+ and Fe2+ ions dissolved in a fused electrolyte (LiCl+KCl) at 503°C is controlled by ion diffusion and by metal interdiffusion. These transport properties are studied by chronopotentiometry. During the reduction step two transition times are observed; these times depend on the diffusion fluxes of Ni2+ and Fe2+ ions. At the end of this reduction pulse, oxidation of the alloy coating by Ni2+ ions gives rise to a potential jump which characterizes the metal interdiffusion. At short times a large increase of the interdiffusion rate is observed; this effect is attributed to a rapid transport process occurring in the very first atomic layers of the coating; it presents some similitude with the underpotential shift observed in metal deposition at room temperature.
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DOI: 10.1016/0022-0728(88)85097-6
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A. 430, Université Pierre et Marie Curie, 4 place Jussieu</wicri:regionArea><orgName type="university">Université Pierre-et-Marie-Curie</orgName><placeName><settlement type="city">Paris</settlement><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Derja, Ahmed" sort="Derja, Ahmed" uniqKey="Derja A" first="Ahmed" last="Derja">Ahmed Derja</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Electrochimie, U. A. 430, Université Pierre et Marie Curie, 4 place Jussieu</wicri:regionArea><orgName type="university">Université Pierre-et-Marie-Curie</orgName><placeName><settlement type="city">Paris</settlement><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Kumagai, Naoaki" sort="Kumagai, Naoaki" uniqKey="Kumagai N" first="Naoaki" last="Kumagai">Naoaki Kumagai</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire d'Electrochimie, U. A. 430, Université Pierre et Marie Curie, 4 place Jussieu</wicri:regionArea><orgName type="university">Université Pierre-et-Marie-Curie</orgName><placeName><settlement type="city">Paris</settlement><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Electroanalytical Chemistry</title><title level="j" type="abbrev">JEC</title><idno type="ISSN">0022-0728</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1988">1988</date><biblScope unit="volume">248</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="369">369</biblScope><biblScope unit="page" to="380">380</biblScope></imprint><idno type="ISSN">0022-0728</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-0728</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">It is shown that the simultaneous electroreduction of Ni2+ and Fe2+ ions dissolved in a fused electrolyte (LiCl+KCl) at 503°C is controlled by ion diffusion and by metal interdiffusion. These transport properties are studied by chronopotentiometry. During the reduction step two transition times are observed; these times depend on the diffusion fluxes of Ni2+ and Fe2+ ions. At the end of this reduction pulse, oxidation of the alloy coating by Ni2+ ions gives rise to a potential jump which characterizes the metal interdiffusion. At short times a large increase of the interdiffusion rate is observed; this effect is attributed to a rapid transport process occurring in the very first atomic layers of the coating; it presents some similitude with the underpotential shift observed in metal deposition at room temperature.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Paris</li></settlement><orgName><li>Université Pierre-et-Marie-Curie</li></orgName></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Lantelme, Frederic" sort="Lantelme, Frederic" uniqKey="Lantelme F" first="Frédéric" last="Lantelme">Frédéric Lantelme</name></region><name sortKey="Derja, Ahmed" sort="Derja, Ahmed" uniqKey="Derja A" first="Ahmed" last="Derja">Ahmed Derja</name><name sortKey="Kumagai, Naoaki" sort="Kumagai, Naoaki" uniqKey="Kumagai N" first="Naoaki" last="Kumagai">Naoaki Kumagai</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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