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首页> 外文期刊>Advanced Science Letters >The Electrochemical Hydrogen Storage Characteristics of La_(0.75-x)Zr_xMg_(0.25)Ni_(32)Co_(0.2)Al_(0.1), (x = 0-0.2) Alloys Prepared by Melt Spinning
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The Electrochemical Hydrogen Storage Characteristics of La_(0.75-x)Zr_xMg_(0.25)Ni_(32)Co_(0.2)Al_(0.1), (x = 0-0.2) Alloys Prepared by Melt Spinning

机译：熔融纺丝制备的La_（0.75-x）Zr_xMg_（0.25）Ni_（32）Co_（0.2）Al_（0.1），（x = 0-0.2）合金的电化学储氢特性

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摘要

In order to improve the electrochemical hydrogen storage characteristics of the La-Mg-Ni system A_2B_7-type electrode alloys, La in the alloys was partially substituted by Zr. The melt-spinning technology was used for preparing La_(0.75-x)Zr_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1) (x = 0, 0.05, 0.1, 0.15, 0.2) electrode alloys. The influences of both the substitution of Zr for La and the melt spinning on the structures and the electrochemical performances of the alloys were investigated in detail. The structure analysis of XRD, SEM and TEM reveals that the as-cast and spun alloys have a multiphase structure, composing of two main phases (La, Mg)_2Ni_7 and LaNi_5 as well as a residual phase LaNi_2. The substitution of Zr for La facilitates to form a like amorphousstructure in the as-spun alloy without altering the structures of two major phases. The electrochemical measurement indicates that both the substitution of Zr for La and the melt spinning impair the electrochemical hydrogen storage kinetics, but they remarkably improve the cycle stability of the alloys. The capacity retaining rate (S_(100)) of the Zr_(0.2) alloy at 100th charging/discharging cycle is enhanced from 76.69 to 85.18% by growing spinning rate from 0 (as-cast was defined as the spinning rate of 0 m/s) to 30 m/s. And that of the as-spun (10 m/s) alloys is increased from 69.25 to 83.09% by rising Zr content from 0 to 0.2.
机译：为了改善La-Mg-Ni系A_2B_7型电极合金的电化学储氢特性，合金中的La被Zr部分取代。熔体纺丝技术用于制备La_（0.75-x）Zr_xMg_（0.25）Ni_（3.2）Co_（0.2）Al_（0.1）（x = 0、0.05、0.1、0.15、0.2）电极合金。详细研究了Zr代替La和熔体纺丝对合金结构和电化学性能的影响。 XRD，SEM和TEM的结构分析表明，铸态和旋转态合金具有多相结构，由两个主要相（La，Mg）_2Ni_7和LaNi_5以及残余相LaNi_2组成。用Zr代替La有助于在初生合金中形成类似的非晶态结构，而不会改变两个主要相的结构。电化学测量表明，用Zr代替La和熔融纺丝均会损害电化学储氢动力学，但它们显着提高了合金的循环稳定性。 Zr_（0.2）合金在第100次充电/放电循环时的容量保持率（S_（100））通过将纺丝速率从0增加（铸态定义为0 m / s，从76.69提高到85.18％）。 s）至30 m / s。通过将Zr含量从0增加到0.2，将初生（10 m / s）合金的含量从69.25％增加到83.09％。

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