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

Content Provider	Springer Nature Link
Author	Belgacem, Yassine Ben Khaldi, Chokri Boussami, Sami Lamloumi, Jilani Mathlouthi, Hamadi
Copyright Year	2014
Abstract	The electrochemical properties of LaY2Ni9 alloy used as an anode in nickel-metal hydride batteries were investigated at ambient and at different temperatures. Several techniques, such as the galvanostatic charging and discharging, the constant potential discharge, and the potentiodynamic polarization, were applied to characterize these electrochemical properties. The discharge capacity of the LaY2Ni9 alloy increases to reach 258 mAh g−1 after 5 cycles and decreases to 140 mAh g−1 after 100 cycles then stabilizes around this same value indicating good cycling held. The hydrogen diffusion coefficient D H in the bulky alloy is estimated to be (1.02 ± 0.11) × 10−11 cm2 s−1 correlated with the good stability of electrochemical capacity after 100 cycles. The evolution of the ratio $$ \frac{D_{\mathrm{H}}}{a^2} $$ and the corrosion current density and potential are correlated with the evolution of the electrochemical capacity during the activation and for a long cycling. The enthalpy, the entropy, and the apparent activation energy of the LaY2Ni9 hydride formation are evaluated. The calculated results show that the enthalpy change, the entropy change, and the activation energy are (−42.64 ± 1.08), (56.85 ± 2.11), and (14.84 ± 0.35) kJ mol−1, respectively.
Starting Page	2019
Ending Page	2026
Page Count	8
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	18
Issue Number	7
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-03-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrochemical properties Hydrogen reactions Activation energy Thermodynamics Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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