NickelMaghrebV1, France, Analysis, bibRecord, 000169

Hydriding and electrochemical properties of amorphous rich MgxNi100-x nanomaterial obtained by mechanical alloying starting from Mg2Ni and MgNi2

Identifieur interne : 000169 ( France/Analysis ); précédent : 000168; suivant : 000170

Hydriding and electrochemical properties of amorphous rich MgxNi100-x nanomaterial obtained by mechanical alloying starting from Mg2Ni and MgNi2

Auteurs : S. Mokbli [Tunisie] ; M. Abdellaoui [Tunisie] ; H. Zarrouk [Tunisie] ; M. Latroche [France] ; A. Percheron Guegan [France]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 2008.

RBID : Pascal:08-0320516

Descripteurs français

Pascal (Inist)
- Hydruration, Propriété électrochimique, Alliage mécanique, Broyeur satellite, Broyeur boulet, Coefficient diffusion, Voltammétrie cyclique, Transfert charge, Dimension particule, Désorption, Nanomatériau, Magnésium alliage, Nickel alliage.

English descriptors

KwdEn :
- Ball mill, Charge transfer, Cyclic voltammetry, Desorption, Diffusion coefficient, Electrochemical properties, Hydridation, Magnesium alloy, Mechanical alloying, Nanostructured materials, Nickel alloy, Particle size, Planetary mill.

Abstract

Using a planetary ball mill and starting from a mixture of Mg₂Ni and MgNi₂ with a Mg atomic content ranging from 40 to 60 at.%, we have successfully elaborated some amorphous phase rich materials. The synthesis of the amorphous phase proceeded at milling intensity 6 with milling conditions corresponding to 5.93 W/g shock power, for milling durations ranging from 6 h 30 min for the Mg₄₀Ni₆₀ sample to 9 h for the Mg₆₀Ni₄₀ sample. For the Mg₅₀Ni₅₀ sample synthesized at only 7h 30 min, the best solid-H₂ capacity (1.82H/u.f. of MgNi) was obtained under 25°C. The electrochemical properties of the Mg_xNi_100-x alloys used as negative electrode in Ni-MH accumulators have been investigated by different electrochemical methods such as the cyclic voltametry, the chronopotentiometry and the chronoamperometry. The experimental results indicate that the discharge capacity reaches a maximum value of 340 mAh/g for the Mg₅₀Ni₅₀ sample synthesized at only 7 h 30 min since the first cycle and then decreases to about 192 mAh/g after 20 cycles. For all sample compositions, the value of the mean diffusion coefficient D_H, determined by cyclic voltammetry, varies from 22 x 10^-9 to 154 x 10^-9 cm² s^-1. Whereas, the charge transfer coefficient a, determined by the same method, varies from 0.22 to 0.88. The chronoamperometry shows that the average size of the particles involved in the electrochemical reaction varies from 19 to 31 μm.

Affiliations:

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Le document en format XML

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Ni<sub>100-x</sub>
 nanomaterial obtained by mechanical alloying starting from Mg<sub>2</sub>
Ni and MgNi<sub>2</sub>
</title>
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<author><name sortKey="Percheron Guegan, A" sort="Percheron Guegan, A" uniqKey="Percheron Guegan A" first="A." last="Percheron Guegan">A. Percheron Guegan</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Hydriding and electrochemical properties of amorphous rich Mg<sub>x</sub>
Ni<sub>100-x</sub>
 nanomaterial obtained by mechanical alloying starting from Mg<sub>2</sub>
Ni and MgNi<sub>2</sub>
</title>
<author><name sortKey="Mokbli, S" sort="Mokbli, S" uniqKey="Mokbli S" first="S." last="Mokbli">S. Mokbli</name>
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<author><name sortKey="Zarrouk, H" sort="Zarrouk, H" uniqKey="Zarrouk H" first="H." last="Zarrouk">H. Zarrouk</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>National Institute of Research and Physic-Chemistry Analyses, Technological Pole</s1>
<s2>2020 Sidi Thabet</s2>
<s3>TUN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
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<country>Tunisie</country>
<wicri:noRegion>2020 Sidi Thabet</wicri:noRegion>
</affiliation>
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<author><name sortKey="Latroche, M" sort="Latroche, M" uniqKey="Latroche M" first="M." last="Latroche">M. Latroche</name>
<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Laboratoire de Chimie Métallurgique des Terres Rares, GLVT, 2-8 Rue Henri Dunant</s1>
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<s3>FRA</s3>
<sZ>4 aut.</sZ>
<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>
<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="02"><s1>Laboratoire de Chimie Métallurgique des Terres Rares, GLVT, 2-8 Rue Henri Dunant</s1>
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<country>France</country>
<placeName><region type="region" nuts="2">Île-de-France</region>
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</placeName>
</affiliation>
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<series><title level="j" type="main">Journal of alloys and compounds</title>
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<imprint><date when="2008">2008</date>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ball mill</term>
<term>Charge transfer</term>
<term>Cyclic voltammetry</term>
<term>Desorption</term>
<term>Diffusion coefficient</term>
<term>Electrochemical properties</term>
<term>Hydridation</term>
<term>Magnesium alloy</term>
<term>Mechanical alloying</term>
<term>Nanostructured materials</term>
<term>Nickel alloy</term>
<term>Particle size</term>
<term>Planetary mill</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Hydruration</term>
<term>Propriété électrochimique</term>
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<term>Broyeur satellite</term>
<term>Broyeur boulet</term>
<term>Coefficient diffusion</term>
<term>Voltammétrie cyclique</term>
<term>Transfert charge</term>
<term>Dimension particule</term>
<term>Désorption</term>
<term>Nanomatériau</term>
<term>Magnésium alliage</term>
<term>Nickel alliage</term>
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<front><div type="abstract" xml:lang="en">Using a planetary ball mill and starting from a mixture of Mg<sub>2</sub>
Ni and MgNi<sub>2</sub>
 with a Mg atomic content ranging from 40 to 60 at.%, we have successfully elaborated some amorphous phase rich materials. The synthesis of the amorphous phase proceeded at milling intensity 6 with milling conditions corresponding to 5.93 W/g shock power, for milling durations ranging from 6 h 30 min for the Mg<sub>40</sub>
Ni<sub>60</sub>
 sample to 9 h for the Mg<sub>60</sub>
Ni<sub>40</sub>
 sample. For the Mg<sub>50</sub>
Ni<sub>50</sub>
 sample synthesized at only 7h 30 min, the best solid-H<sub>2</sub>
 capacity (1.82H/u.f. of MgNi) was obtained under 25°C. The electrochemical properties of the Mg<sub>x</sub>
Ni<sub>100-x</sub>
 alloys used as negative electrode in Ni-MH accumulators have been investigated by different electrochemical methods such as the cyclic voltametry, the chronopotentiometry and the chronoamperometry. The experimental results indicate that the discharge capacity reaches a maximum value of 340 mAh/g for the Mg<sub>50</sub>
Ni<sub>50</sub>
 sample synthesized at only 7 h 30 min since the first cycle and then decreases to about 192 mAh/g after 20 cycles. For all sample compositions, the value of the mean diffusion coefficient D<sub>H</sub>
, determined by cyclic voltammetry, varies from 22 x 10<sup>-9</sup>
 to 154 x 10<sup>-9</sup>
 cm<sup>2</sup>
 s<sup>-1</sup>
. Whereas, the charge transfer coefficient a, determined by the same method, varies from 0.22 to 0.88. The chronoamperometry shows that the average size of the particles involved in the electrochemical reaction varies from 19 to 31 μm.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
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<country name="France"><region name="Île-de-France"><name sortKey="Latroche, M" sort="Latroche, M" uniqKey="Latroche M" first="M." last="Latroche">M. Latroche</name>
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<name sortKey="Percheron Guegan, A" sort="Percheron Guegan, A" uniqKey="Percheron Guegan A" first="A." last="Percheron Guegan">A. Percheron Guegan</name>
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Hydriding and electrochemical properties of amorphous rich MgxNi100-x nanomaterial obtained by mechanical alloying starting from Mg2Ni and MgNi2

Hydriding and electrochemical properties of amorphous rich MgxNi100-x nanomaterial obtained by mechanical alloying starting from Mg2Ni and MgNi2

Source :

Descripteurs français

English descriptors

Abstract

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