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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 properties of ZrV_xNi_(3.5-x) (x = 0.0-0.9) metal hydride alloys
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Hydrogen storage properties of ZrV_xNi_(3.5-x) (x = 0.0-0.9) metal hydride alloys

机译：ZrV_xNi_（3.5-x）（x = 0.0-0.9）金属氢化物合金的储氢性能

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摘要

The structure, gaseous storage, and electrochemical properties of a series of ZrV_xNi_(3.5-x) (x = 0.0-0.9) metal hydride alloys were studied for this report. Several trends were observed as the V-content in the alloy was increased. First, the main Zr_2Ni_7 phase shifted from a monoclinic structure to a cubic one, and the abundance of secondary phases (ZrNi_3 and ZrNi_5) decreased. Secondly, the equilibrium pressure in the gaseous phase increased, and the hydrogen storage first decreased and then increased. Lastly, electrochemical testing showed that the discharge capacity increased and then decreased, and both the high-rate dischargeability and the bulk diffusion constant increased. Compared with other metal hydride systems, the alloys in the current study showed better bulk reaction kinetics but worse surface reaction kinetics. The electrochemical discharge capacity was higher than the gaseous phase capacity, which can be explained by a synergetic effect of the secondary phases.
机译：本报告研究了一系列ZrV_xNi_（3.5-x）（x = 0.0-0.9）金属氢化物合金的结构，气体存储和电化学性能。随着合金中V含量的增加，观察到了几种趋势。首先，Zr_2Ni_7主相从单斜晶结构转变为立方相，第二相（ZrNi_3和ZrNi_5）的丰度降低。其次，气相中的平衡压力增加，并且储氢量先降低然后增加。最后，电化学测试表明，放电容量先升高后降低，高倍率放电率和体积扩散常数均增加。与其他金属氢化物体系相比，当前研究中的合金显示出更好的整体反应动力学，但表面反应动力学更差。电化学放电容量高于气相容量，这可以通过次级相的协同作用来解释。

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