Electrochemical properties of the MmNi3.55Mn0.4Al0.3 Co0.4Fe0.35 compound
Identifieur interne : 000241 ( France/Analysis ); précédent : 000240; suivant : 000242Electrochemical properties of the MmNi3.55Mn0.4Al0.3 Co0.4Fe0.35 compound
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 ] ; 2005.
Descripteurs français
- Pascal (Inist)
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Abstract
In this paper, the electrochemical properties of the MmNi3.55Mn0.4Al0.3Co0.4Fe0.35 alloy used as a negative electrode in Ni-MH accumulators, have been investigated by different electrochemical methods such as cyclic voltammetry, chronopotentiometry, chronoamperometry and electrochemical impedance spectroscopy. The experimental results indicate that the discharge capacity reaches a maximum value of 260 mAh g-1 after 12 cycles and then decreases to about 200 mAh g-1 after 70 cycles. The value of the mean diffusion coefficient DH, determined by cyclic voltammetry, is about 3.44 × 10-9 cm2 s-1, whereas the charge transfer coefficient a, determined by the same method, is about 0.5 which allows us to conclude that the electrochemical reaction is reversible. The hydrogen diffusion coefficients in this compound, corresponding to 10 and 100% of the charge state, determined by electrochemical impedance spectroscopy, are, respectively, equal to 4.15 x 10-9 cm2 s-1 (a phase) and 2.15 x 10-9 cm2 s-1 (β phase). These values are higher, for the a phase and less, for the β phase, than the mean value determined by cyclic voltammetry. We assume that this is related to the number of interstitial sites susceptible to accept the hydrogen atom, which are more numerous in the a phase than in the β phase. The chronoamperometry shows that the average size of the particles involved in the electrochemical reaction is about 12 μm.
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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, des Matériaux et Procédés, ESSTT, 5 Avenue</s1><s2>Taha Hussein 1008</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Taha Hussein 1008</wicri:noRegion></affiliation></author><author><name sortKey="Abdellaoui, M" sort="Abdellaoui, M" uniqKey="Abdellaoui M" first="M." last="Abdellaoui">M. 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Ben" last="Moussa">M. 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, des Matériaux et Procédés, ESSTT, 5 Avenue</s1><s2>Taha Hussein 1008</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>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, des Matériaux et Procédés, ESSTT, 5 Avenue</s1><s2>Taha Hussein 1008</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>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, des Matériaux et Procédés, ESSTT, 5 Avenue</s1><s2>Taha Hussein 1008</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>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="Guegan, A Percheron" sort="Guegan, A Percheron" uniqKey="Guegan A" first="A. Percheron" last="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="2005">2005</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>Chronoamperometry</term><term>Chronopotentiometry</term><term>Cyclic voltammetry</term><term>Diffusion coefficient</term><term>Electrochemical properties</term><term>Electrode impedance</term><term>Electrode material</term><term>Nickel hydrogen batteries</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Propriété électrochimique</term><term>Coefficient diffusion</term><term>Voltammétrie cyclique</term><term>Chronopotentiométrie</term><term>Chronoampérométrie</term><term>Batterie nickel hydrogène</term><term>Impédance électrode</term><term>Matériau électrode</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In this paper, the electrochemical properties of the MmNi<sub>3.55</sub>Mn<sub>0.4</sub>Al<sub>0.3</sub>Co<sub>0.4</sub>Fe<sub>0.35</sub> alloy used as a negative electrode in Ni-MH accumulators, have been investigated by different electrochemical methods such as cyclic voltammetry, chronopotentiometry, chronoamperometry and electrochemical impedance spectroscopy. The experimental results indicate that the discharge capacity reaches a maximum value of 260 mAh g<sup>-1</sup> after 12 cycles and then decreases to about 200 mAh g<sup>-1</sup> after 70 cycles. The value of the mean diffusion coefficient D<sub>H</sub>, determined by cyclic voltammetry, is about 3.44 × 10<sup>-9</sup> cm<sup>2</sup> s<sup>-1</sup>, whereas the charge transfer coefficient a, determined by the same method, is about 0.5 which allows us to conclude that the electrochemical reaction is reversible. The hydrogen diffusion coefficients in this compound, corresponding to 10 and 100% of the charge state, determined by electrochemical impedance spectroscopy, are, respectively, equal to 4.15 x 10<sup>-9</sup> cm<sup>2</sup> s<sup>-1</sup> (a phase) and 2.15 x 10<sup>-9</sup> cm<sup>2</sup> s<sup>-1</sup> (β phase). These values are higher, for the a phase and less, for the β phase, than the mean value determined by cyclic voltammetry. We assume that this is related to the number of interstitial sites susceptible to accept the hydrogen atom, which are more numerous in the a phase than in the β phase. The chronoamperometry shows that the average size of the particles involved in the electrochemical reaction is about 12 μm.</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="Moussa, M Ben" sort="Moussa, M Ben" uniqKey="Moussa M" first="M. Ben" last="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="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><name sortKey="Moussa, M Ben" sort="Moussa, M Ben" uniqKey="Moussa M" first="M. Ben" last="Moussa">M. Ben Moussa</name></country><country name="France"><region name="Île-de-France"><name sortKey="Guegan, A Percheron" sort="Guegan, A Percheron" uniqKey="Guegan A" first="A. Percheron" last="Guegan">A. Percheron Guegan</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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