Journal
JOURNAL OF RARE EARTHS
Volume 33, Issue 4, Pages 397-402Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(14)60432-4
Keywords
La-Mg-Ni-based alloys; Y substitution; phase composition; electrochemical kinetics; rare earths
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Funding
- National Natural Science Foundation of China [51171165, 21303157]
- Natural Science Foundation of Hebei Province [B2012203027, B2012203104, B2014203114]
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Yttrium (Y) has been used as the partial substitution element for lanthanum (La) to improve the electrochemical kinetic performances of La-Mg-Ni-based hydrogen storage alloys. La0.80-xYxMg0.20Ni2.85Mn0.10Co0.55Al0.10 (x=0.00, 0.05 and 0.10) alloys were prepared by the inductive melting technique. The alloys were composed of LaNi5 and (La,Mg)(2)Ni-7 phases, the introduction of Y promoted the formation of (La,Mg)(2)Ni-7 phase, and thus the Y-substituted alloy electrodes exhibited higher discharge capacities. Y substitution was also found to be effective to improve the discharge kinetics of the alloy electrodes. When the Y content x increased from 0.00 to 0.10, the high-rate dischargeability of the alloy electrodes at a discharge current density of 1800 mA/g (HRD1800) increased from 23.6% to 39.7% at room temperature. In addition, the measured HRD1800 showed a linear dependence on both the exchange current density and the hydrogen diffusion coefficient at different temperatures, respectively.
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