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首页> 外文期刊>International journal of hydrogen energy >Study on the gaseous and electrochemical hydrogen storage properties of as-milled Ce-Mg-Ni-based alloys
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Study on the gaseous and electrochemical hydrogen storage properties of as-milled Ce-Mg-Ni-based alloys

机译：研磨后的Ce-Mg-Ni基合金的气态和电化学储氢性能研究

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For gaining further insight into the involvement of the gaseous and electrochemical hydrogen storage properties of CeMg12-type alloys, partial substitution and ball milling were both used to synthesize the nanocrystalline and amorphous CeMg11Ni + x wt.% Ni (x = 100, 200) samples. This research aims at elucidating the functional roles of Ni content and milling time on samples' structure and hydrogen storage performance. X-Ray diffraction and high-resolution transmission electron microscope were used to reveal the micro constructions of alloys. To determine the gaseous hydrogen storage property, Sievert's apparatus and a thermal gravity analysis bonded with a H-2 probe were adopted. The dehydrogenation activation energy was computed in the Kissinger method. The electrochemical performances of the as-milled samples were measured through a constant current system. Further researches showed that the electrochemical performance of as-milled samples had been dramatically improved by increasing Ni content. With milling duration lengthens, the gaseous hydrogen absorption capacity, gaseous hydriding rate and high rate discharge capability of samples reached the maximal values, but electrochemical discharge capacity and gaseous dehydriding rate always increased. The dehydrogenation activation energy decrease resulted by improving Ni percent and milling duration was deemed as the cause of the excellent gaseous kinetics of samples. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：为了进一步了解CeMg12型合金的气态和电化学储氢性能，使用部分置换和球磨法合成了纳米晶体和非晶态CeMg11Ni + x wt。％Ni（x = 100，200）样品。这项研究旨在阐明镍含量和研磨时间对样品结构和储氢性能的功能作用。 X射线衍射和高分辨率透射电子显微镜被用来揭示合金的微观结构。为了确定气态氢的贮藏性能，采用了Sievert的设备和与H-2探针结合的热重分析。脱氢活化能通过基辛格法计算。通过恒流系统测量研磨后样品的电化学性能。进一步的研究表明，通过增加Ni含量，已研磨样品的电化学性能得到了显着改善。随着研磨时间的延长，样品的气态氢吸收能力，气态氢化率和高倍率放电能力达到最大值，但电化学放电能力和气态脱水率始终提高。镍含量的提高导致脱氢活化能的降低，而研磨时间的延长被认为是样品出色的气体动力学的原因。 （C）2019氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

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