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=O)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 performances of the Mg2Ni-type alloys,Ni in the alloy was partially substituted by element Co.The nanocrystalline and amorphous Mg20Ni10-xCox(x=0,1,2,3,4)alloys were prepared by melt-spinning technology.The structures of the as-cast and spun alloys were studied by XRD,SEM and HRTEM.The electrochemical hydrogen storage characteristics of the alloys were measured.The results show that the substitution of Co for Ni leads to the formation of secondary phase MgCo2 without altering the major phase of Mg2Ni.No amorphous phase is detected in the as-spun alloy(x=0),whereas the as-spun alloy(x=4)holds a nanocrystalline and amorphous structure,confirming that the substitution of Co for Ni significantly increases the glass forming ability of the Mg2Ni-type alloy.The substitution of Co for Ni significantly improves the electrochemical hydrogen storage performances of the alloys,including the discharge capacity and the cycle stability,for which the increased glass forming ability by Co substitution is mainly responsible.
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