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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 >Microstructure and kinetics evolution in MgH_2-TiO_2 pellets after hydrogen cycling
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Microstructure and kinetics evolution in MgH_2-TiO_2 pellets after hydrogen cycling

机译：氢循环后MgH_2-TiO_2颗粒的微观结构和动力学演化

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摘要

The interest in Mg-based hydrides for solid state hydrogen storage is associated to their capability to reversibly absorb and desorb large amounts of hydrogen. In this work MgH_2 powder with 5 wt.% TiO_2 was ball milled for 10 h. The as-milled nanostructured powder was enriched with 5 wt.% of Expanded Natural Graphite (ENG) and then compacted in cylindrical pellets by cold pressing using different loads. Both the powder and the pellets were subjected to kinetic and thermodynamic tests using a Sievert's type gas reaction controller, in order to study the microstruc-tural and kinetic changes which took place during repeated H_2 absorption and desorption cycles. The pellets exhibited good kinetic performance and durability, even if the pressure of compaction revealed to be an important parameter for their mechanical stability. Scanning Electron Microscopy observations of as-prepared and cycled pellets were carried out to investigate the evolution of their microstructure. In turn the phase composition before and after cycling was analyzed by X-ray diffraction.
机译：对用于固态氢存储的基于Mg的氢化物的兴趣与其可逆地吸收和解吸大量氢的能力有关。在这项工作中，将含5 wt。％TiO_2的MgH_2粉末球磨10小时。研磨后的纳米结构粉末富含5 wt。％的膨胀天然石墨（ENG），然后通过使用不同负载的冷压将其压制成圆柱状颗粒。为了研究在重复的H_2吸收和解吸循环中发生的微观结构和动力学变化，使用Sievert型气体反应控制器对粉末和颗粒进行了动力学和热力学测试。粒料表现出良好的动力学性能和耐久性，即使压实压力显示出其机械稳定性的重要参数也是如此。扫描电子显微镜观察制备的和循环的颗粒，以研究其微观结构的演变。依次通过X射线衍射分析循环前后的相组成。

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