Investigation of the cycle stability and diffusivity of hydrogen in the MmNi3.55Mn0.4Al0.3Co0.6Fe0.15 compound
Identifieur interne : 000210 ( France/Analysis ); précédent : 000209; suivant : 000211Investigation of the cycle stability and diffusivity of hydrogen in the MmNi3.55Mn0.4Al0.3Co0.6Fe0.15 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 ] ; 2006.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
The hydrogen storage alloy MmNi3.55Mn0.4Al0.3Co0.6Fe0.15 was used as a negative electrode in Ni-MH accumulators. The chronopoten-tiometry, the cyclic voltammetry and the chronoamperometry were applied to characterize the electrochemical properties of this alloy. The obtained results showed that the maximum discharge capacity reaches its maximum of 266mAh/g after 16 cycles, and then decreases to 220 mAh/g after 40 charge-discharge cycles. The hydrogen diffusion behaviour in this alloy was characterized by a cyclic voltammetry after activation. The value of the hydrogen diffusion coefficient in the MmNi3.55Mn0.4Al0.3Co0.6Fe0.15 compound is equal to 1.95 x 10-9 cm2 s-1, and the value of the charge-transfer coefficient in this alloy is about 0.6. These results showed that compared to the LaNi5 compound, this alloy has a better stability in the alkaline solution, a good reversibility and a good kinetic of the electrochemical reaction. The chronoamperometry shows that the average size of the particles concerned by the electrochemical reaction is about 12 μm.
Affiliations:
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Pascal:06-0079384Le document en format XML
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Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.6</sub>
Fe<sub>0.15</sub>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Investigation of the cycle stability and diffusivity of hydrogen in the MmNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.6</sub>
Fe<sub>0.15</sub>
compound</title>
<author><name sortKey="Ben Moussa, M" sort="Ben Moussa, M" uniqKey="Ben Moussa M" first="M." last="Ben Moussa">M. Ben Moussa</name>
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<s2>Hussein 1008</s2>
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<sZ>4 aut.</sZ>
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<wicri:noRegion>Hussein 1008</wicri:noRegion>
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<author><name sortKey="Lamloumi, J" sort="Lamloumi, J" uniqKey="Lamloumi J" first="J." last="Lamloumi">Jilani Lamloumi</name>
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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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<s3>FRA</s3>
<sZ>5 aut.</sZ>
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<series><title level="j" type="main">Journal of alloys and compounds</title>
<title level="j" type="abbreviated">J. alloys compd.</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Charge transfer</term>
<term>Cyclic voltammetry</term>
<term>Diffusivity</term>
<term>Electrochemical properties</term>
<term>Hydrogen storage</term>
<term>Kinetics</term>
<term>Nickel alloy</term>
<term>Particle size</term>
<term>Rare earth metal alloy</term>
<term>Reversible processes</term>
<term>Transition metal alloy</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Diffusivité</term>
<term>Stockage hydrogène</term>
<term>Voltammétrie cyclique</term>
<term>Propriété électrochimique</term>
<term>Transfert charge</term>
<term>Processus réversible</term>
<term>Cinétique</term>
<term>Dimension particule</term>
<term>Lanthanide alliage</term>
<term>Nickel alliage</term>
<term>Métal transition alliage</term>
</keywords>
</textClass>
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<front><div type="abstract" xml:lang="en">The hydrogen storage alloy MmNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.6</sub>
Fe<sub>0.15</sub>
was used as a negative electrode in Ni-MH accumulators. The chronopoten-tiometry, the cyclic voltammetry and the chronoamperometry were applied to characterize the electrochemical properties of this alloy. The obtained results showed that the maximum discharge capacity reaches its maximum of 266mAh/g after 16 cycles, and then decreases to 220 mAh/g after 40 charge-discharge cycles. The hydrogen diffusion behaviour in this alloy was characterized by a cyclic voltammetry after activation. The value of the hydrogen diffusion coefficient in the MmNi<sub>3.55</sub>
Mn<sub>0.4</sub>
Al<sub>0.3</sub>
Co<sub>0.6</sub>
Fe<sub>0.15</sub>
compound is equal to 1.95 x 10<sup>-9</sup>
cm<sup>2</sup>
s<sup>-1</sup>
, and the value of the charge-transfer coefficient in this alloy is about 0.6. These results showed that compared to the LaNi<sub>5</sub>
compound, this alloy has a better stability in the alkaline solution, a good reversibility and a good kinetic of the electrochemical reaction. The chronoamperometry shows that the average size of the particles concerned by 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>
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</region>
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<li>Tunis</li>
</settlement>
<orgName><li>Université de Tunis</li>
</orgName>
</list>
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<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>
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<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>
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