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采用中频感应熔炼-快淬炉制备了La15-xNdxFe14Ni64Mn5B2(x=0、2、4、6)储氢合金。扫描电镜(SEM)及能谱(EDS)分析表明,这些合金由(La,Nd)Ni5相、(Fe,Ni)相和(La,Nd)3Ni13B2相组成。X射线衍射(XRD)分析表明,Nd含量对合金的相组成没有影响,但随Nd含量的增加,衍射峰向高角度方向轻微位移。电化学测试表明,随x值的增大,合金电极的放电容量及高倍率放电能力(HRD)先增加后减小,x=2时的放电容量(302mAh.g-1)最高,HRD值(1050 mA.g-1放电时为65.6%)最大。充放电循环稳定性随x值的增大而增加。适量的Nd替代La有利于改善LaFeNiMnB储氢合金的综合电化学性能。
La15-xNdxFe14Ni64Mn5B2 (x = 0, 2, 4, 6) hydrogen storage alloy was prepared by IF induction melting-quenching furnace. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis show that these alloys consist of (La, Nd) Ni5 phase, (Fe, Ni) phase and (La, Nd) 3Ni13B2 phase. X-ray diffraction (XRD) analysis showed that the content of Nd had no influence on the phase composition of the alloy, but the diffraction peak shifted slightly toward the high angle with the increase of Nd content. Electrochemical tests showed that the discharge capacity and high-rate discharge capacity (HRD) of the alloy electrode first increased and then decreased with the increase of x value, and the discharge capacity (302mAh.g-1) was the highest at x = 2. The HRD value 65% at 1050 mA.g-1 discharge). The charge-discharge cycle stability increases with the increase of x value. Appropriate amount of Nd substitution La is beneficial to improve the comprehensive electrochemical performance of LaFeNiMnB hydrogen storage alloys.