Electrochemical properties of LaY2Ni9 hydrogen storage alloy, used as an anode in nickel-metal hydride batteries

Belgacem, Yassine Ben; Khaldi, Chokri; Boussami, S.; Lamloumi, J.; Mathlouthi, H.

doi:10.1007/s10008-014-2448-5

Cited by 39 publications

(12 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method consists to apply a linear potential scan rate of 1mV s -1 , on the LaY 2 Ni 9 negative electrode, after each cycle of charge and discharge, during a long cycling and at different discharge rates. The obtained voltammograms at different discharge rates and during a long cycling, are treated by the first Stern-Geary method using EC-Lab software in order to draw the potentiodynamic polarization curves (or Tafel curves) [26,27]. The corrosion potential during the first activation cycles, and for all rates, undergoes an increase to the direction of the positive potential to reach the maximum values of, -887, -883, -871 and 911mV respectively for C/3, C/5, C/10 and C/20 discharge rates.…”

Section: Evolution Of the Corrosion Parameters During A Long Cycling mentioning

confidence: 99%

Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy

Belgacem¹,

Khaldi²,

Lamloumi³

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy. Journal of Alloys and Compounds, Elsevier, 2015, 631, pp. AbstractThe use of new hydrogen absorbing alloys as negative electrodes in rechargeable batteries has allowed the consideration of nickel-metal hydride batteries to replace the conventional nickelcadmium alkaline or lead acid batteries. In this study the LaY 2 Ni 9 hydrogen storage alloys was prepared and the effect of the discharge rate on the electrochemical properties of the active material was investigated. For this case, several electrochemical methods such as the galvanostatic charging and discharging, the constant potential discharge, and the potentiodynamic polarization are used to better understand the effect of the discharge rate on the behavior of the LaY 2 Ni 9 electrode.The decrease of the discharge rate, firstly, facilitates the activation of the alloy and other hand, causes the decrease of the drop potential that can be correlated with both the maximum discharge capacity and the cycle number of activation. After activation the electrochemical discharge capacity undergoes a rapid decay before slowing during a long cycling. A good stability and cycling lifetime are observed for C/10 rate. This degradation is mainly due to the corrosion of the electrode surface overlooked to the aggressive electrolyte (1M).The corrosion current density at the first activation cycle increases as a function of the electrochemical cycling. This growth becomes faster when the discharge rate becomes smaller.The corrosion potential during the first activation cycles, and for all rates, undergoes an increase to the direction of the positive potential. For a long cycling and except of the C/20 rate, an oscillating stabilization of both the corrosion current density and potential are observed and is better for the C/10 rate which is in good agreement with the good holding to cycling for this medium rate.

show abstract

Section: Evolution Of the Corrosion Parameters During A Long Cycling mentioning

confidence: 99%

Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy

Belgacem¹,

Khaldi²,

Lamloumi³

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the Equation 5 With the grain size determined in the previous work [70], after electrochemical tests of a long cycling, the diffusion coefficient of the CeY 2 Ni 9 mono-substituted electrode is estimated to be 6.8 10 -11 cm 2 s -1 , which is slightly lower than that of the LaY 2 Ni 9 parent electrode.…”

Section: Diffusivity Indicator (D H /A 2 ) Of the Cey 2 Ni 9 During Amentioning

confidence: 97%

“…The aim of the present work is to study the electrochemical properties of the CeY 2 Ni 9 alloy, used as an anode in nickel-metal hydride batteries, at room and at different temperatures. A comparative study will be carried out to compare the results obtained by this alloy with those of the LaY 2 Ni 9 parent alloy [70] and therefore evaluate the effect of the substitution of La by Ce on the electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

The electrochemical performance of AB3-type hydrogen storage alloy as anode material for the nickel metal hydride accumulators

Belgacem

Khaldi

Lamloumi

et al. 2016

J Solid State Electrochem

Self Cite

View full text Add to dashboard Cite

For the purpose of lowering the cost of metal hydride electrode, the La of LaY 2 Ni 9 electrode was replaced by Ce. The electrochemical performances of the CeY 2 Ni 9 negative electrode, at a room and different temperatures, were compared with the parent alloy LaY 2 Ni 9. At room temperature during a long cycling, the evolution of the electrochemical capacity; the diffusivity indicator (H 2 D a), the exchange current density, and the equilibrium potential were determined. At different temperatures, the electrochemical characterization of this alloy allowed the estimation of the enthalpy, the entropy, and the activation energy of the hydride formation. The evolution of the high-rate dischargeability was also evaluated at different temperatures. Compared with, the parent LaY 2 Ni 9 alloy, CeY 2 Ni 9 exhibits an easy activation and a good reaction reversibility. This alloy also conserves a good lifetime during a long term cycling. A lower activation energy determined for this alloy corresponds to an easy absorption of hydrogen into this new alloy.

show abstract

“…This method consists to apply a linear potential scan rate of 1 mV s -1 , on the LaY 2 Ni 9 negative electrode, after each cycle of charge and discharge, during a long cycling and at C/3 and C/10 rates. The obtained voltammograms at these discharge rates during a long cycling are treated by the Butler-Volmer equation [6,7].…”

Section: B Evolution Of the Redox Parameters During A Long Cycling Amentioning

confidence: 99%

Electrochemical hydrogenation of LaY<inf>2</inf>Ni<inf>9</inf> anode at C/3 and C/10 discharge rates for nickel-metal hydride batteries

Belgacem

Khaldi

Lamloumi

2015

IREC2015 the Sixth International Renewable Energy Congress

Self Cite

View full text Add to dashboard Cite

the electrochemical hydrogenation of the LaY 2 Ni 9 alloy as a negative electrode material of a nickel-metal hydride accumulator has been investigated at C/3 and C/10 rates. For this case, several electrochemical methods such as the galvanostatic charging and discharging (chronopotentiometry), the constant potential discharge (chronoamperometry), and the cyclic voltametry were used to investigate the hydrogen absorptiondesorption and electrochemical properties. The decrease of the discharge rate makes the maximum discharge capacity greater and activation cycle number smaller. The evolution of the potential difference with the decrease of the discharge rate can be correlated with both the maximum discharge capacity and the cycle number of activation. The electrochemical discharge capacity undergoes an important increase during first cycles attributed to the activation of the alloy, then it decay gradually with increasing cycling. This decreasing becomes more important with C/3 rate. The evolution of the redox parameters and the diffusion coefficient (D H /a 2 ) is correlated with the activation phenomenon which confirm the good results obtained by the C/10 rate, knowing that the cycling plays a role of stripping the surface of the electrode, that is to say the removal of a continuous manner of oxides from the surface of the electrode, engendering a reduction of its thickness.

show abstract

Electrochemical properties of LaY2Ni9 hydrogen storage alloy, used as an anode in nickel-metal hydride batteries

Cited by 39 publications

References 32 publications

Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy

Effect of the discharge rate on the electrochemical properties of LaY2Ni9 hydrogen storage alloy

The electrochemical performance of AB3-type hydrogen storage alloy as anode material for the nickel metal hydride accumulators

Electrochemical hydrogenation of LaY<inf>2</inf>Ni<inf>9</inf> anode at C/3 and C/10 discharge rates for nickel-metal hydride batteries

Contact Info

Product

Resources

About