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在Ar气保护下,采用高频感应悬浮炉制备La0.7-xPrxZr0.1Mg0.2Ni2.75Co0.45Fe0.1Al0.2(x=0.00,0.05,0.10,0.15,0.20)合金,研究Pr替代La对合金电极电化学性能的影响。结果显示,所有合金主要由LaNi5和La2Ni7相组成,以Pr替代La后,LaNi5相和La2Ni7合金相的晶胞收缩,导致氢原子在合金电极体内扩散受限,合金电极的动力学性能下降。但由于Pr的抗腐蚀作用,合金电极循环稳定性增加,经过200次充放电循环后容量保持率分别从66.2%(x=0.00)逐渐增加到69.5%(x=0.05)、73.2%(x=0.10)、74.0%(x=0.15)和75.1%(x=0.20)。
Under Ar gas protection, La0.7-xPrxZr0.1Mg0.2Ni2.75Co0.45Fe0.1Al0.2 (x = 0.00,0.05,0.10,0.15,0.20) alloys were prepared by high frequency induction furnace. Effect of Electrochemical Performance of Alloy Electrode. The results show that all alloys consist mainly of LaNi5 and La2Ni7 phases. When La is replaced by Pr, the unit cell shrinkage of LaNi5 phase and La2Ni7 alloy phase leads to limited diffusion of hydrogen atoms in the alloy electrode and decreased kinetic performance of the alloy electrode. However, due to the anti-corrosion effect of Pr, the cycling stability of the alloy electrode increased. The capacity retention rate increased gradually from 66.2% (x = 0.00) to 69.5% (x = 0.05) and 73.2% (x = 0.10), 74.0% (x = 0.15) and 75.1% (x = 0.20).