Electrochemical properties of the MmNi3.55Mn0.4Al0.3 Co0.75-xFex (x=0.55 and 0.75) compounds
Identifieur interne : 000790 ( Main/Exploration ); précédent : 000789; suivant : 000791Electrochemical properties of the MmNi3.55Mn0.4Al0.3 Co0.75-xFex (x=0.55 and 0.75) compounds
Auteurs : M. Ben Moussa [Tunisie] ; M. Abdellaoui [Tunisie] ; H. Mathlouthi [Tunisie] ; Jilani Lamloumi [Tunisie] ; A. Percheron Guegan [France]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2008.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
The hydrogen storage alloys MmNi3.55Mn0.4Al0.3Co0.75-xFex (x=0.55 and 0.75) were used as negative electrodes in the Ni-MH accumulators. The chronopotentiommetry and the cyclic voltammetry were applied to characterize the electrochemical properties of these alloys. The obtained results showed that the substitution of the cobalt atoms by iron atoms has a good effect on the life cycle of the electrode. For the MmNi3.55Mn0.4Al0.3Co0.2Fe0.55 compound, the discharge capacity reaches its maximum of 210mAh/g after 12 cycles and then decreases to 190mAh/g after 30 charge-discharge cycles. However, for the MmNi3.55Mn0.4Al0.3Fe0.75 compound, the discharge capacity reaches its maximum of 200 mAh/g after 10 cycles and then decreases to 160 mAh/g after 30 cycles. The diffusion behavior of hydrogen in the negative electrodes made from these alloys was characterized by cyclic voltammetry after few activation cycles. The values of the hydrogen coefficient in MmNi3.55Mn0.4Al0.3Co0.2Fe0.55 and MmNi3.55Mn0.4Al0.3Fe0.75 are, respectively, equal to 2.96 x 10-9 and 4.98 × 10-10 cm2 s-1. However, the values of the charge transfer coefficients are, respectively, equal to 0.33 and 0.3. These results showed that the substitution of cobalt by iron decreases the reversibility and the kinetic of the electrochemical reaction in these alloys.
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Ben Moussa</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut National de Recherche et d'Analyse Physico-chimique, Pôle Technologique de Sidi Thabet</s1><s2>2020 Sidi Thabet</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>2020 Sidi Thabet</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT 5 Avenue Taha Hussein 1008</s1><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT 5 Avenue Taha Hussein 1008</wicri:noRegion></affiliation></author><author><name sortKey="Abdellaoui, M" sort="Abdellaoui, M" uniqKey="Abdellaoui M" first="M." last="Abdellaoui">M. Abdellaoui</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institut National de Recherche et d'Analyse Physico-chimique, Pôle Technologique de Sidi Thabet</s1><s2>2020 Sidi Thabet</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>2020 Sidi Thabet</wicri:noRegion></affiliation></author><author><name sortKey="Mathlouthi, H" sort="Mathlouthi, H" uniqKey="Mathlouthi H" first="H." last="Mathlouthi">H. Mathlouthi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT 5 Avenue Taha Hussein 1008</s1><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT 5 Avenue Taha Hussein 1008</wicri:noRegion></affiliation></author><author><name sortKey="Lamloumi, J" sort="Lamloumi, J" uniqKey="Lamloumi J" first="J." last="Lamloumi">Jilani Lamloumi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT 5 Avenue Taha Hussein 1008</s1><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT 5 Avenue Taha Hussein 1008</wicri:noRegion><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName><orgName type="university" n="3">Université de Tunis</orgName></affiliation></author><author><name sortKey="Percheron Guegan, A" sort="Percheron Guegan, A" uniqKey="Percheron Guegan A" first="A." last="Percheron Guegan">A. Percheron Guegan</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire de Chimie Métallurgique des Terres Rares, GLVT 2-8 Rue Henri Dunant</s1><s2>94320 Thiais</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Thiais</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Charge transfer</term><term>Diffusion coefficient</term><term>Electrochemical properties</term><term>Electrochemical reaction</term><term>Hydrogen storage</term><term>Kinetics</term><term>Misch metal</term><term>Nickel hydrogen batteries</term><term>Rare earth metal alloy</term><term>Reversible processes</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Propriété électrochimique</term><term>Stockage hydrogène</term><term>Transfert charge</term><term>Processus réversible</term><term>Cinétique</term><term>Coefficient diffusion</term><term>Batterie nickel hydrogène</term><term>Lanthanide alliage</term><term>Mischmetal</term><term>Réaction électrochimique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The hydrogen storage alloys MmNi<sub>3.55</sub>Mn<sub>0.4</sub>Al<sub>0.3</sub>Co<sub>0.75-x</sub>Fe<sub>x</sub> (x=0.55 and 0.75) were used as negative electrodes in the Ni-MH accumulators. The chronopotentiommetry and the cyclic voltammetry were applied to characterize the electrochemical properties of these alloys. The obtained results showed that the substitution of the cobalt atoms by iron atoms has a good effect on the life cycle of the electrode. For the MmNi<sub>3.55</sub>Mn<sub>0.4</sub>Al<sub>0.3</sub>Co<sub>0.2</sub>Fe<sub>0.55</sub> compound, the discharge capacity reaches its maximum of 210mAh/g after 12 cycles and then decreases to 190mAh/g after 30 charge-discharge cycles. However, for the MmNi<sub>3.55</sub>Mn<sub>0.4</sub>Al<sub>0.3</sub>Fe<sub>0.75</sub> compound, the discharge capacity reaches its maximum of 200 mAh/g after 10 cycles and then decreases to 160 mAh/g after 30 cycles. The diffusion behavior of hydrogen in the negative electrodes made from these alloys was characterized by cyclic voltammetry after few activation cycles. The values of the hydrogen coefficient in MmNi<sub>3.55</sub>Mn<sub>0.4</sub>Al<sub>0.3</sub>Co<sub>0.2</sub>Fe<sub>0.55</sub> and MmNi<sub>3.55</sub>Mn<sub>0.4</sub>Al<sub>0.3</sub>Fe<sub>0.75</sub> are, respectively, equal to 2.96 x 10<sup>-9</sup> and 4.98 × 10<sup>-10</sup> cm<sup>2</sup> s<sup>-1</sup>. However, the values of the charge transfer coefficients are, respectively, equal to 0.33 and 0.3. These results showed that the substitution of cobalt by iron decreases the reversibility and the kinetic of the electrochemical reaction in these alloys.</div></front></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Gouvernorat de Tunis</li><li>Île-de-France</li></region><settlement><li>Thiais</li><li>Tunis</li></settlement><orgName><li>Université de Tunis</li></orgName></list><tree><country name="Tunisie"><noRegion><name sortKey="Ben Moussa, M" sort="Ben Moussa, M" uniqKey="Ben Moussa M" first="M." last="Ben Moussa">M. Ben Moussa</name></noRegion><name sortKey="Abdellaoui, M" sort="Abdellaoui, M" uniqKey="Abdellaoui M" first="M." last="Abdellaoui">M. Abdellaoui</name><name sortKey="Ben Moussa, M" sort="Ben Moussa, M" uniqKey="Ben Moussa M" first="M." last="Ben Moussa">M. Ben Moussa</name><name sortKey="Lamloumi, J" sort="Lamloumi, J" uniqKey="Lamloumi J" first="J." last="Lamloumi">Jilani Lamloumi</name><name sortKey="Mathlouthi, H" sort="Mathlouthi, H" uniqKey="Mathlouthi H" first="H." last="Mathlouthi">H. Mathlouthi</name></country><country name="France"><region name="Île-de-France"><name sortKey="Percheron Guegan, A" sort="Percheron Guegan, A" uniqKey="Percheron Guegan A" first="A." last="Percheron Guegan">A. Percheron Guegan</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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