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Effect of La_2O_3-CaO composite additive on the hydrogen storage properties of Mg_2Ni alloy

机译：La_2O_3-CaO复合添加剂对Mg_2Ni合金储氢性能的影响

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摘要

La_2O_3-CaO composite additive is employed to accelerate the hydrogen absorption/desorption rate of the Mg_2Ni alloy. The composite additive was ball milled with Mg_2Ni hydride to produce Mg_2Ni-5 wt.% La_2O_3-5 wt.% CaO composite. The composite additive significantly reduces the thermal stability of Mg_2NiH_4. The onset decomposition temperature of the hydrogenated composite is 470 K, 21 K lower than that of the pure Mg_2NiH_4. Meanwhile, the composite presents accelerated hydriding/dehydriding kinetic properties. It absorbs 1.61 wt.% H at 373 K in 2 h and releases 2.44 wt.% H at 573 K in 1200 s, while the absorbed and desorbed hydrogen by the Mg_2NiH_4 is only 0.78 wt.% H and 1.32 wt.% H, respectively. The improvement in the hydrogen storage properties of the Mg_2Ni alloy by the adoption of La_2O_3-CaO additive is ascribed to the modified catalytic effects of La_2O_3 and CaO in the composite.
机译：使用La_2O_3-CaO复合添加剂可加速Mg_2Ni合金的氢吸收/解吸速率。将复合添加剂与Mg_2Ni氢化物球磨，以生产Mg_2Ni-5 wt。％La_2O_3-5 wt。％CaO复合材料。复合添加剂显着降低了Mg_2NiH_4的热稳定性。氢化复合物的起始分解温度为470 K，比纯Mg_2NiH_4低21K。同时，该复合材料表现出加速的氢化/脱水动力学性能。它在2小时内在373 K下吸收1.61 wt。％H，在1200 s内在573 K下释放2.44 wt。％H，而Mg_2NiH_4吸收和解吸的氢仅为0.78 wt。％H和1.32 wt。％H，分别。通过采用La_2O_3-CaO添加剂改善Mg_2Ni合金的储氢性能，归因于La_2O_3和CaO在复合材料中的改性催化作用。

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  • 来源
    《Materials Science and Engineering》 |2014年第10期|114-118|共5页
  • 作者

    Jianzheng Song; Shumin Han; Ruidong Fu;

  • 作者单位

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, PR China, Hebei key laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, PR China, Hebei key laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrogen absorbing materials; Mechanical alloying; Microstructure; Thermal analysis;

    机译：吸氢材料;机械合金化;微观结构热分析;

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