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采用熔炼法制备La_(0.60)Pr_(0.15)Mg_(0.25)Ni_(3.2)Co_(0.20)Si_(0.10)铸态储氢合金,将铸态合金分别在950oC条件下退火处理3 h,以及以1 m/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La Ni5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。
The La_ (0.60) Pr_ (0.15) Mg_ (0.25) Ni_ (3.2) Co_ (0.20) Si_ (0.10) as-cast hydrogen storage alloy was prepared by melting method and the as-cast alloys were respectively annealed at 950oC for 3 h. 1 m / s speed quenching. The structure and hydrogen storage properties of the three alloys were systematically investigated. XRD results show that the phase structure of the alloy after annealing and quenching treatment did not change significantly, the main phase are La Ni5 phase. Electrochemical tests show that the maximum discharge capacity and cycle stability of annealed and quenched alloys are improved compared with that of as-cast alloys. The results of kinetics test show that the high-rate performance of the annealed and quenched alloys decreases, the surface charge transfer resistance increases, and the exchange current density increases. The ultimate current density of the annealed alloy has the maximum value.