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

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...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2016-07, Vol.20 (7), p.1949-1959
Main Authors: Belgacem, Yassine Ben, Khaldi, Chokri, Lamloumi, Jilani, Takenouti, Hisasi
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemical Sciences
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electric power
Electrochemistry
Energy Storage
Engineering Sciences
Original Paper
Other
Physical Chemistry
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Summary: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 ( D H a 2 )—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 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.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-016-3198-3