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Hydrogen storage behavior of nanocrystalline and amorphous Mg–Ni–Cu–La alloys

机译：纳米晶和无定形Mg-Ni-Cu-La合金的储氢行为

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摘要

Alloying and structural modification are two effective ways to enhance the hydrogen storage kinetics and decrease the thermal stability of Mg and Mg-based alloys. In order to enhance the characteristics of Mg _(2) Ni-type alloys, Cu and La were added to an Mg _(2) Ni-type alloy, and the sample alloys (Mg _(24) Ni _(10) Cu _(2) ) _(100? x ) La _( x ) ( x = 0, 5, 10, 15, 20) were prepared by melt spinning. The influences of La content and spinning rate on the gaseous and electrochemical hydrogen storage properties of the sample alloys were explored in detail. The structural identification carried out by XRD and TEM indicates that the main phase of the alloys is Mg _(2) Ni and the addition of La results in the formation of the secondary phases LaMg _(3) and La _(2) Mg _(17) . The as-spun alloys have amorphous and nanocrystalline structures, and the addition of La promotes glass formation. The electrochemical properties examined by an automatic galvanostatic system show that the samples possess a good activation capability and achieve their maximal discharge capacities within three cycles. The discharge potential characteristics were vastly ameliorated by melt spinning and La addition. The discharge capacities of the samples achieve their maximal values as the La content changes, and the discharge capacities always increase with increasing spinning rate. The addition of La leads to a decline in hydrogen absorption capacity, but it can effectively enhance the rate of hydrogen absorption. The addition of La and melt spinning significantly increase the hydrogen desorption rate due to the reduced activation energy.
机译：合金化和结构改性是增强储氢动力学的两种有效方法，降低Mg和Mg基合金的热稳定性。为了增强Mg _（2）Ni型合金的特性，将Cu和10加入Mg _（2）Ni型合金中，以及样品合金（Mg _（24）Ni _（10）Cu _（2））通过熔融纺丝制备_（100≤x）La _（x）（x = 0,5,10,15,20）。详细探讨了La含量和纺纱率对样品合金的气态和电化学储氢性能的影响。通过XRD和TEM进行的结构鉴定表明合金的主阶段是Mg _（2）Ni，并且加入La导致二次相的形成La _（3）和La _（2）mg _ （17）。纺粘合金具有无定形和纳米晶体结构，并加入La促进玻璃形成。通过自动镀锌系统检测的电化学性能表明，样品具有良好的活化能力，并在三个循环中实现其最大放电容量。通过熔融纺丝和LA加法，放电势特征大大改善。样品的放电容量可以随着LA含量的变化实现其最大值，并且放电容量随着纺纱率的增加而始终增加。加入La导致氢吸收能力下降，但它可以有效地提高氢吸收率。由于减少的活化能量，加入La和熔融纺丝显着增加了氢解吸速率。

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