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为了改善Mg2Ni型合金的电化学贮氢性能,用Co部分替代合金中的Ni。用快淬工艺制备了纳米晶和非晶Mg20Ni10-xCox(x=0,1,2,3,4)电极合金,用XRD、SEM、HRTEM分析了铸态及快淬态合金的微观结构,测试了合金的电化学贮氢性能。结果表明,Co替代Ni不改变合金的Mg2Ni主相,但形成了第二相MgCo2。在快淬(x=0)合金中没有发现非晶相,但快淬(x=4)合金显示了纳米晶、非晶结构,表明Co替代Ni提高了Mg2Ni型合金的非晶形成能力。Co替代Ni显著的改善了合金的电化学贮氢性能,包括放电容量和电化学循环稳定性,这主要归因于Co替代Ni提高了合金的非晶形成能力。
In order to improve the electrochemical hydrogen storage properties of Mg2Ni alloy, Co is used to partially replace Ni in the alloy. The nanocrystalline and amorphous Mg20Ni10-xCox (x = 0,1,2,3,4) electrode alloys were prepared by a rapid quenching process. The microstructures of as-cast and quenched alloys were analyzed by XRD, SEM and HRTEM. The electrochemical hydrogen storage alloy performance. The results show that Co instead of Ni does not change the main phase Mg2Ni alloy, but the formation of the second phase MgCo2. No amorphous phase was found in the quenched (x = 0) alloy. However, the quenched (x = 4) alloy showed nanocrystalline and amorphous structure, indicating that the substitution of Co for Ni enhanced the amorphous formation ability of Mg2Ni alloy. Co substitution Ni significantly improved the electrochemical hydrogen storage properties of the alloy, including discharge capacity and electrochemical cycle stability, which is mainly due to Co instead of Ni to improve the amorphous alloy formation ability.