Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy
Identifieur interne : 000039 ( Main/Exploration ); précédent : 000038; suivant : 000040Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy
Auteurs : Yassine Ben Belgacem [Tunisie] ; Chokri Khaldi [Tunisie] ; Jilani Lamloumi [Tunisie] ; Hisasi Takenouti [France]Source :
- Journal of Alloys and Compounds [ 0925-8388 ] ; 2015-05.
English descriptors
- mix :
Abstract
In this study, the LaY2Ni9 hydrogen storage alloy is prepared and the effect of the discharge rate on theelectrochemical properties of the active material is investigated.The decrease of the discharge rate, firstly, facilitates the activation of the alloy, and other hand, causesthe decrease of the potential difference between charging and discharging that can be correlated withboth the maximum discharge capacity and the cycle number of activation. After activation, the electrochemicaldischarge capacity undergoes a rapid decay before slowing down during a long cycling. A goodstability and cycling lifetime are observed for C/10 rate.The exchange current density at initial activation cycles increases as a function of the electrochemicalcycling. The smaller the discharge rate is, the faster this growth is. The Nernst potential during the initialactivation cycles for all discharge rates shifts toward more positive direction. For a long cycling andexcept of the C/20 rate, an oscillating stabilization of both the exchange current density and Nernstpotential are observed, and the C/10 rate exhibits the best behavior, in good agreement with the goodmaintaining of performance.
Url:
DOI: 10.1016/j.jallcom.2015.01.074
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">In this study, the LaY2Ni9 hydrogen storage alloy is prepared and the effect of the discharge rate on theelectrochemical properties of the active material is investigated.The decrease of the discharge rate, firstly, facilitates the activation of the alloy, and other hand, causesthe decrease of the potential difference between charging and discharging that can be correlated withboth the maximum discharge capacity and the cycle number of activation. After activation, the electrochemicaldischarge capacity undergoes a rapid decay before slowing down during a long cycling. A goodstability and cycling lifetime are observed for C/10 rate.The exchange current density at initial activation cycles increases as a function of the electrochemicalcycling. The smaller the discharge rate is, the faster this growth is. The Nernst potential during the initialactivation cycles for all discharge rates shifts toward more positive direction. For a long cycling andexcept of the C/20 rate, an oscillating stabilization of both the exchange current density and Nernstpotential are observed, and the C/10 rate exhibits the best behavior, in good agreement with the goodmaintaining of performance.</div>
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