Improved hydrogen storage performances of Mg-Y-Ni-Cu alloys by melt spinning
Improved hydrogen storage performances of Mg-Y-Ni-Cu alloys by melt spinning
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熔体纺丝改善 Mg-Y-Ni-Cu 合金的储氢性能
DOI：
10.1016/j.renene.2019.01.106
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发表时间：
2019
期刊：
影响因子：
8.7
通讯作者：
Zhao Dongliang
中科院分区：
文献类型：
--
作者：
Zhang Yanghuan;Li Xufeng;Cai Ying;Qi Yan;Guo Shihai;Zhao Dongliang
本文采用熔体旋压技术成功地制备了Mg_(25-x)Y_xNi_9Cu(x= _(0，1，3，5，7))合金。用透射电子显微镜和X射线衍射仪对合金进行了检测，以表征合金的结构。利用Sievert装置、差示扫描量热法(DSC)和热重分析法(TGA)研究了氢气的吸放氢性能。我们用Arrhenius和Kisinger方法计算了合金氢化物脱氢的活化能。结果表明，熔体旋压和Y替代镁显著降低了合金的热力学参数(Δ、Hand、Δ、S)，并使开始放氢温度明显降低。对于这类合金，Y替代了Mg明显降低了吸氢量。吸氢量随纺丝速度的增加先增大后减小。Y替代镁和熔体旋压对吸氢动力学略有影响，但使放氢动力学显著改善。合金的脱氢活化能随Y含量的增加和旋压速度的增加而显著降低，这是影响脱氢反应速度的根本原因。
In the article, melt spinning was successfully applied to prepare Mg25-xYxNi9Cu (x= 0, 1, 3, 5, 7) alloys. The alloys were detected by the equipment of TEM and XRD to describe the structure of the alloys. Sievert’s apparatus, DSC and TGA connected with a H2detector were utilized to investigate properties of absorbing and desorbing hydrogen. We utilized Arrhenius and Kissinger methods to reckon activation energy for desorbing hydrogen from the alloy hydrides. It is found that melt spinning and Y substitution for Mg visibly decrease the thermodynamic parameters (ΔHand ΔS) as well as make starting hydrogen desorption temperature obviously decline. For this kind of alloy, Y taking place of Mg distinctly decreases the hydrogen absorption capacity. The hydrogen absorption capacity augments at first and afterward declines following spinning rate increasing. Y replacing Mg and melt spinning slightly impair the kinetics for absorbing hydrogen, but make the kinetics for desorbing hydrogen significantly improved. The activation energy of desorbing hydrogen from the alloys markedly lowers following the proportion of Y and spinning rate increasing, which is identified as the root-cause that affect the velocity of hydrogen desorption reaction.