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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Hydrogen storage characteristics of nanocrystalline and amorphous Mg_2Ni-type alloys prepared by melt spinning
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Hydrogen storage characteristics of nanocrystalline and amorphous Mg_2Ni-type alloys prepared by melt spinning

机译：熔融纺丝制备纳米晶态和非晶态Mg_2Ni型合金的储氢特性

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摘要

In order to improve the hydrogen storage characteristics of the Mg_2Ni-type alloys, Ni in the alloy is partially substituted by element Mn, and melt-spinning technology is used for the preparation of the Mg_2Ni_(1-x)Mn_x (x = 0,0.1,0.2,0.3,0.4) hydrogen storage alloys. The microstructures of the as-cast and spun alloys are characterized by XRD, SEM and HRTEM. The hydrogen absorption and desorption kinetics of the alloys are measured by an automatically controlled Sieverts apparatus. The electrochemical performances are tested by an automatic galvanostatic system. The results show that the as-spun Mn-free alloy holds typical nanocrystalline structure, whereas the as-spun alloys containing Mn displays a nanocrystalline and amorphous structure. The hydrogen absorption and desorption capacities and kinetics of the alloys increase with rising spinning rate. Additionally, melt spinning markedly improves the electrochemical hydrogen storage capacity and cycle stability of the alloys containing Mn. With an increase in the spinning rate from 0 (As-casts is defined as spinning rate of 0 m/s) to 30 m/s, the discharge capacity of the (x = 0.3) alloy mounts up from 92.3 to 211.1 mAh/g, and its capacity retaining rate at 20th charging and discharging cycle grows from 36.21% to 76.02%.
机译：为了改善Mg_2Ni型合金的储氢特性，合金中的Ni被Mn元素部分取代，并采用熔纺技术制备Mg_2Ni_（1-x）Mn_x（x = 0， 0.1,0.2,0.3,0.4）储氢合金。 XRD，SEM和HRTEM对铸态和旋压合金的显微组织进行了表征。合金的氢吸收和解吸动力学是通过自动控制的Sieverts设备测量的。电化学性能通过自动恒电流系统进行测试。结果表明，初生无锰合金具有典型的纳米晶结构，而含锰初生合金具有纳米晶和非晶态结构。合金的氢吸收和解吸能力以及动力学随着旋转速度的增加而增加。另外，熔融纺丝显着改善了含Mn合金的电化学储氢能力和循环稳定性。随着纺丝速度从0（铸件定义为0 m / s的铸造速度）增加到30 m / s，（x = 0.3）合金的放电容量从92.3提高到211.1 mAh / g ，其在第20次充放电循环中的容量保持率从36.21％增加到76.02％。

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