Journal
JOURNAL OF RARE EARTHS
Volume 29, Issue 2, Pages 143-149Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(10)60420-6
Keywords
La-Mg-Ni-system alloy; hydrogen storage electrode alloys; electrochemical property; rare earths
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Funding
- National 863 Program of China [2007AA03Z227, 2007AA03Z230]
- Natural Science Foundation of Hebei Province [E2010000301]
- Hebei University [2010060, 2009-152]
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La0.75Mg0.25Ni3.5-xCo0.2Alx (x=0-0.09) hydrogen storage alloys were prepared by induction melting and effect of Al substitution for Ni on phase constitution and electrochemical property was investigated. With the substitution of Al for Ni, LaNi5 and LaNi2 phases occurred and (La, Mg)(2)(Ni, Co, Al)(7) phase with hexagonal Ce2Ni7-type structure replaced (La, Mg)(2)(Ni, Co)(7) phase. The cell volumes of LaNi5 and (La, Mg)(2)(Ni, Co, Al)(7) main phases increased with increasing Al content. Some electrochemical properties and kinetic parameters of the alloys, including discharge capacity, high rate discharge ability (HRD), loss angle (psi), exchange current density (I-0) and limiting current density (I-L), decreased with increasing amount of substitution of Al for Ni. Substitution of Al for Ni could be favorable for positive shift in corrosion potential of the alloy electrode, and prolonged cyclic lifetime of La0.75Mg0.25Ni3.5-xCo0.2Alx (x=0-0.09) alloy electrodes.
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