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研究了镍部分取代AB2型CeMnAl金属间化合物B侧Mn,Al形成的化学计量比合金的结构和电化学性能。XRD分析,SEM形貌观察和电化学性能测试结果表明:镍的部分取代使合金发生了相变化,形成了新相,CeMn1-xAl1-xNi2x(x=0.0,0.25,0.50和0.75)合金电极的电化学活性得到很大提高,298K时的放电容量从x=0时的17.93mAh.g-1提高到x=0.75时的118.3mAh.g-1,328 K时的放电容量从x=0时的68.42mAh.g-1提高到x=0.75时的216.1mAh.g-1。合金的电化学P-C-T曲线表明:无Ni的CeMnAl合金几乎没有平衡氢压平台,随Ni取代量的增加,合金的平衡氢压平台斜率变小,宽度增大。
The structure and electrochemical properties of the stoichiometric alloys formed by the substitution of nickel for the Mn and Al formed on the B side of the AB2-type CeMnAl intermetallic compound have been studied. The results of XRD, SEM and electrochemical tests show that the phase of the alloy changes with the partial substitution of Ni, forming a new phase of CeMn1-xAl1-xNi2x (x = 0.0,0.25,0.50 and 0.75) Electrochemical activity was greatly improved. The discharge capacity at 298K increased from 17.93mAh.g-1 at x = 0 to 118.3mAh.g-1,328K at x = 0.75. The discharge capacity increased from 68.42 at x = 0 mAh.g-1 increased to 216.1 mAh.g-1 at x = 0.75. The electrochemical P-C-T curve of the alloy shows that there is almost no hydrogen equilibrium platform for the Ni-free CeMnAl alloy. With the increase of Ni substitution, the slope of equilibrium hydrogen pressure platform becomes smaller and the width of the alloy increases.