An electrochemical study of mono-substituted intermetallic hydrides
Identifieur interne : 000A69 ( Main/Exploration ); précédent : 000A68; suivant : 000A70An electrochemical study of mono-substituted intermetallic hydrides
Auteurs : R. Baddour-Hadjean [France] ; H. Mathlouthi [Tunisie] ; J. P. Pereira-Ramos [France] ; Jilani Lamloumi [Tunisie] ; M. Latroche [France] ; A. Percheron-Guegan [France]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2003.
Descripteurs français
- Pascal (Inist)
- Cinétique, Corrosion, Diffusion chimique, Coefficient diffusion, Longueur diffusion(transport), Epaisseur, Etude expérimentale, Stockage hydrogène, Impédance, Composé intermétallique, Couche oxyde, Nickel alliage, Cobalt alliage, Lanthane alliage, Manganèse alliage, Aluminium alliage, Alliage LaNiCo, Co La Ni, Alliage LaNiMn, La Mn Ni, 8460V, 6630F, 8245B, Alliage LaNiAl, Al La Ni.
- Wicri :
- topic : Corrosion.
English descriptors
- KwdEn :
Abstract
The electrochemical behaviour of LaNi2.5Co2.5, LaNi4.5Mn0.5 and LaNi4.5Al0.5 intermetallic compounds was investigated using chronopotentiometric and impedance measurements. Electrochemical isotherms have been found to be in good agreement with solid gas determinations. Kinetics data are drawn from impedance spectroscopy for the three compounds. Important changes in the magnitude of a low frequency semicircle in the impedance diagrams have been correlated to a corrosion layer effect which is strongly reduced from the first cycle and as cycling proceeds. A subsequent increase in the apparent hydrogen chemical diffusion coefficient DH is found from the first cycle, which is well correlated to the decrease of the diffusion length through the oxide layer as the thickness of the corrosion layer decreases. The apparent hydrogen chemical diffusion coefficient is found to be one order of magnitude larger in the α phase (10-10 cm2/s) than in the β phase.
Affiliations:
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Le document en format XML
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<series><title level="j" type="main">Journal of alloys and compounds</title>
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<term>Cobalt alloy</term>
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<term>Diffusion coefficient</term>
<term>Diffusion length</term>
<term>Experimental study</term>
<term>Hydrogen storage</term>
<term>Impedance</term>
<term>Intermetallic compound</term>
<term>Kinetics</term>
<term>Lanthanum alloy</term>
<term>Manganèse alloy</term>
<term>Nickel alloy</term>
<term>Oxide layer</term>
<term>Thickness</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Cinétique</term>
<term>Corrosion</term>
<term>Diffusion chimique</term>
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<term>Longueur diffusion(transport)</term>
<term>Epaisseur</term>
<term>Etude expérimentale</term>
<term>Stockage hydrogène</term>
<term>Impédance</term>
<term>Composé intermétallique</term>
<term>Couche oxyde</term>
<term>Nickel alliage</term>
<term>Cobalt alliage</term>
<term>Lanthane alliage</term>
<term>Manganèse alliage</term>
<term>Aluminium alliage</term>
<term>Alliage LaNiCo</term>
<term>Co La Ni</term>
<term>Alliage LaNiMn</term>
<term>La Mn Ni</term>
<term>8460V</term>
<term>6630F</term>
<term>8245B</term>
<term>Alliage LaNiAl</term>
<term>Al La Ni</term>
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<front><div type="abstract" xml:lang="en">The electrochemical behaviour of LaNi<sub>2.5</sub>
Co<sub>2.5</sub>
, LaNi<sub>4.5</sub>
Mn<sub>0.5</sub>
and LaNi<sub>4.5</sub>
Al<sub>0.5</sub>
intermetallic compounds was investigated using chronopotentiometric and impedance measurements. Electrochemical isotherms have been found to be in good agreement with solid gas determinations. Kinetics data are drawn from impedance spectroscopy for the three compounds. Important changes in the magnitude of a low frequency semicircle in the impedance diagrams have been correlated to a corrosion layer effect which is strongly reduced from the first cycle and as cycling proceeds. A subsequent increase in the apparent hydrogen chemical diffusion coefficient D<sub>H</sub>
is found from the first cycle, which is well correlated to the decrease of the diffusion length through the oxide layer as the thickness of the corrosion layer decreases. The apparent hydrogen chemical diffusion coefficient is found to be one order of magnitude larger in the α phase (10<sup>-10</sup>
cm<sup>2</sup>
/s) than in the β phase.</div>
</front>
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