Journal
JOURNAL OF RARE EARTHS
Volume 30, Issue 3, Pages 222-227Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(12)60027-1
Keywords
hydrogen storage alloy; hydrogen storage property; electrochemistry property; rare earths
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Funding
- National Natural Science Foundation of China [50861003, 51071054]
- Natural Science Foundation of Guangxi [2010GXNSFD013004, 2011GXNSFA018034]
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The La0.55Pr0.05Nd0.15Mg0.25Ni3.5(Co0.5Al0.5)(x)(x=0.0, 0.1, 0.3, 0.5) alloys were prepared by magnetic levitation melting under an Ar atmosphere, and the effects of Co and Al on the hydrogen storage and electrochemical properties were systematically investigated by pressure composition isotherms, cyclic voltammetry, Tafel polarization and electrochemical impedance spectroscopy testing. The results showed that the alloy phases were mainly consisted of (La,Pr)(Ni,Co)(5), LaMg2Ni9, (La,Nd)(2)Ni-7 and LaNi3 phases, and the cell volumes of (La,Pr)(Ni,Co)(5), LaMg2Ni9, (La,Nd)(2)Ni-7 and LaNi3 phases expanded with Co and Al element added. The hydrogen storage capacity initially increased from 1.36 (x=0) to 1.47 wt.% (x=0.3) and then decreased to 1.22 wt.% (x=0.5). The discharge capacity retention and cycle stability of the alloy electrodes were improved with the increase of Co and Al contents. The La0.55Pr0.05Nd0.15Mg0.25Ni3.5(Co0.5Al0.5)(0.3) alloy electrode possessed better electrochemical kinetic characteristic.
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