采用熔炼法制备La0.60Pr0.15Mg0.25Ni3.2Co0.20Si0.10铸态储氢合金,将铸态合金分别在950℃条件下退火处理3h,以及以1m/s的速度进行快淬处理.系统研究三种合金的结构及储氢性能.XRD结果表明,退火及快淬处理后合金的相结构未发生明显变化,主相均为LaNi5相.电化学性能测试证明,与铸态合金相比,退火及快淬态合金的最大放电容量及循环稳定性均得到提升.动力学测试结果说明退火及快淬处理的合金高倍率性能降低,表面电荷转移电阻增大,交换电流密度升高,其中退火合金的极限电流密度具有最大值.
As-cast La0.60Pr0.15Mg0.25Ni3.2Co0.20Si0.10alloy was prepared via melting method,then part of the alloy was annealed at 950 ℃ for 3 h,and another part of the alloy was deal with the rapid quenching method while the quenching speed was 1 m/s.The structure and hydrogen storage properties of these three alloys were studied systematically.XRD results showed that the structures of the annealed and melt-spinning alloys were not changed obviously,and the main phase was LaNi5.The electrochemical properties showed that the maximum discharge capacity and the cycle stability of both the annealed and the melt-spinning alloy were improved compared with the as-cast alloy.The kinetic tests indicated that the high ratio discharge properties of the annealed and melt-spinning alloys were degraded,and the charge transfer resistance was increased.Meanwhile,annealing and melt-spinning treatment make the alloys show higher exchange current densities,and the annealed alloy showed the maximum limited current density.
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