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首页> 外文期刊>Applied Surface Science >Studying of electrochemical discharging and kinetic properties of Ni-TiF_3-CeMg_(12) composite materials with nanocrystalline and amorphous structure
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Studying of electrochemical discharging and kinetic properties of Ni-TiF_3-CeMg_(12) composite materials with nanocrystalline and amorphous structure

机译：纳米晶和非晶结构的Ni-TiF_3-CeMg_（12）复合材料的电化学放电和动力学性质的研究

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The ball milling technology was used for fabricating CeMg12/Ni/TiF3 hydrogen materials. The effect of TiF3 content on microstructures and electrochemical performances of the milling alloys was investigated in detail. The microstructures were characterized by scanning electron microcopy (SEM), X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM). The electrochemical hydrogen storage properties were tested by discharging capacity and cycling stability. The electrochemical kinetic characteristics were further analyzed with high rate discharging ability (HRD), electrochemical impedance spectroscopy (EIS) technique, hydrogen diffusion behavior (the diffusion coefficient was denoted by D) and apparent activation energy (DE). The results reveal that the addition of TiF3 notably enhances the glass forming ability of alloy sample. The maximum discharge capacity of experimental alloy first goes upward from 1060 to 1250 mA h/g then decreases to 1050 mA h/g with TiF3 content is increased from 0 to 5 wt.%. The milling CeMg12-Ni-TiF3 (5 wt.%) alloy shows the best electrochemical cycle stability. The milled CeMg12-Ni-TiF3 (3 wt.%) alloy has optimum electrochemical kinetic performances, which is responsible for the smallest surface activation energy and the fastest hydrogen diffusion rate. (C) 2018 Elsevier B.V. All rights reserved.
机译：球磨技术用于制造CeMg12 / Ni / TiF3氢材料。详细研究了TiF3含量对铣削合金组织和电化学性能的影响。通过扫描电子显微镜（SEM），X射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）对微观结构进行了表征。通过放电容量和循环稳定性测试电化学储氢性能。用高倍率放电能力（HRD），电化学阻抗谱（EIS）技术，氢扩散行为（扩散系数用D表示）和表观活化能（DE）进一步分析了电化学动力学特性。结果表明，TiF3的添加显着增强了合金样品的玻璃形成能力。实验合金的最大放电容量首先从1060到1250 mA h / g上升，然后随着TiF3含量从0到5 wt。％降低到1050 mA h / g。研磨的CeMg12-Ni-TiF3（5 wt。％）合金显示出最佳的电化学循环稳定性。研磨后的CeMg12-Ni-TiF3（3 wt。％）合金具有最佳的电化学动力学性能，这是导致最小的表面活化能和最快的氢扩散速率的原因。 （C）2018 Elsevier B.V.保留所有权利。

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