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首页> 外文期刊>RSC Advances >Metallic glassy Ti2Ni grain-growth inhibitor powder for enhancing the hydrogenation/dehydrogenation kinetics of MgH2
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Metallic glassy Ti2Ni grain-growth inhibitor powder for enhancing the hydrogenation/dehydrogenation kinetics of MgH2

机译：金属玻璃Ti2Ni晶粒生长抑制剂粉末，用于增强MGH2的氢化/脱氢动力学

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摘要

Because of its high thermal stability and poor hydrogenation/dehydrogenation kinetics, magnesium hydride (MgH2) requires mechanical treatment and/or doping with catalytic agents(s) to understand the decomposition temperature and accelerate the gas uptake/release kinetics. Whereas all catalytic species used for this purpose are crystalline materials, in this paper use of titanium nickel (Ti2Ni) metallic glassy (MG) nanopowders for enhancing the hydrogenation/dehydrogenation kinetics behavior of MgH2 powders is reported. In the present research, MG-Ti2Ni ribbons, prepared using a melt spinning technique were snipped into small pieces and then cryo-milled under a flow of liquid nitrogen to obtain submicron-powders (500 nm). The as-prepared MgH2 powders were doped with 10wt% of the glassy powder and then cryo-milled for 25 h. The structural and morphological analysis indicated that the cryo-milling process succeeded in maintaining the short-range order structure of MG-Ti2Ni, and in reducing the MgH2 grain size to the nanolevel. The results showed that the as-prepared nanocomposite powders obtained after 25 h of cryo-milling decomposed at 283 degrees C, with an apparent activation energy of 87.3 kJ mol(-1). The MgH2/10 wt% MG-Ti2Ni nanocomposite powders were cold rolled into thin strips, using a cold rolling technique. These cold rolled strips possessed excellent morphological characteristics, shown by the homogeneous distribution of the MgH2 spherical particles (10 nm in diameter) in the glassy Ti2Ni matrix. Furthermore, the hydrogenation/dehydrogenation kinetics measured at 225 degrees C were very fast, as indicated by the short time (400 s) required to uptake/release 5.7 wt% H-2. At this temperature, the system possessed good life-time cycling performance - achieving 84 continuous cycles within 30 h without failure or degradation.
机译：由于其高热稳定性和较差的氢化/脱氢动力学，氢化镁（MGH2）需要机械处理和/或掺杂催化剂，以了解分解温度并加速气体摄取/释放动力学。然而，为了此目的的所有催化物质是结晶材料，在本文中，据报道，在本文中使用钛镍（Ti2Ni）金属玻璃（Mg）纳米粉粉来增强MGH2粉末的氢化/脱氢动力学行为。在本研究中，使用熔融纺丝技术制备的Mg-Ti2Ni带剪成小块，然后在液氮的流动下冷冻研磨以获得亚微米粉末（500nm）。用10wt％的玻璃状粉末掺杂如制备的MgH2粉末，然后冷冻研磨25小时。结构和形态学分析表明，低温研磨过程成功地保持MG-TI2NI的短距离顺序结构，以及将MGH2晶粒尺寸降低到纳米。结果表明，在283℃下分解25小时后得到的制备纳米复合材料粉末在283℃下分解，具有87.3kJ摩尔（-1）的表观活化能。使用冷轧技术，冷轧为薄带的MgH2 / 10wt％Mg-Ti2Ni纳米复合粉末。这些冷轧条具有优异的形态特征，通过玻璃Ti2Ni基质中的MgH2球形颗粒（直径为10nm）的均匀分布所示。此外，在225摄氏度下测量的氢化/脱氢动力学非常快，如缩短/释放5.7wt％H-2所需的短时间（400秒）所示。在这种温度下，系统具有良好的寿命循环性能 - 在30小时内实现84个连续循环而没有失败或降解。

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  • 来源
    《RSC Advances》 |2019年第2期|共11页
  • 作者

    El-Eskandarany Mohamed Sherif;

  • 作者单位

    Kuwait Inst Sci Res Energy &

    Bldg Res Ctr Nanotechnol &

    Adv Mat Program Safat 13109 Kuwait;

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  • 正文语种 eng
  • 中图分类 化学;
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