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采用铸造及退火工艺制备了La0.8-x Prx Mg0.2Ni3.35Al0.1Si0.05(x=0,0.1,0.2,0.3,0.4)电极合金。系统研究了Pr的替代对合金的结构与电化学储氢性质的影响,结果表明除少量残余LaNi3相外,铸造及退火合金是由六方Ce2Ni7型(La,Mg)2Ni7相与六方CaCu5型LaNi5相构成的。Pr对La的置换对合金的电化学储氢性质产生明显影响,铸造及退火合金的放电容量和高倍率放电能力随Pr含量的增加先升后降。当Pr含量由0增加至0.4时,铸造及退火合金的100次充放电循环后容积保持率S100从64.96%和72.82%分别增加至77.94%和91.81%。
La0.8-x Prx Mg0.2Ni3.35Al0.1Si0.05 (x = 0,0.1,0.2,0.3,0.4) electrode alloy was prepared by casting and annealing process. The effect of Pr substitution on the structure and electrochemical hydrogen storage properties of the alloy was systematically studied. The results show that the cast and annealed alloys are composed of hexagonal Ce2Ni7 (La, Mg) 2Ni7 and hexagonal CaCu5 LaNi5 Constitute. The substitution of Pr for La has a significant effect on the electrochemical hydrogen storage properties of the alloy. The discharge capacity and high-rate discharge capacity of cast and annealed alloys increase first and then decrease with the increase of Pr content. When the content of Pr increased from 0 to 0.4, the volume retention S100 increased from 64.96% and 72.82% to 77.94% and 91.81% respectively after 100 cycles of charging and discharging.