Mg-Ni-CNTs复合材料储氢性能研究

Hydrogen Storage Property of Mg-Ni-CNTs Composites

用机械球磨法在3.0 MPa氢气气氛下制备出镁基复合储氢材料Mg-Ni-CNTs,研究了材料的吸放氢性能以及在吸放氢过程中温度的变化.X射线衍射分析表明,球磨60 h后的物相组成为MgH2、Mg2NiH4和Ni,表明球磨过程中发生了反应.SEM分析表明,复合体系中成分分布均匀.300℃时在60 s内吸氢量达到7.2%.300℃、3 MPa下,在100 s内放氢量达到6.6%,该复合储氢材料具有较高的活性和储氢量.

The Mg-based hydrogen storage composite material of Mg-Ni-CNTs was prepared by mechanically ball milling under 3 MPa hydrogen pressure and by XRD. It was confirmed that after ball milling for 60 h,the composite was composed of Mg2NiH4 ,MgH2 and Ni. The SEM analysis also indicated that the composition distribution was homogeneous. The composite possesses a high reactivity and hydrogen storage capacity. The nanocomposite can absorb 7.2 wt% hydrogen in 60s and desorb 6.6wt % hydrogen in 100s at 300℃ under 3MPa hydrogen pressure.