Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

Studies show that the carbon nanotubes (CNTs) serve as hydrogen diffusion channels, when used with magnesium hydride. The hydrogen sorption study, of a MgH2 and 5wt% of multiwalled carbon nanotubes mixture, was the main purpose of this work. The samples were analyzed by means of X-ray diffraction (XRD) and also studied in a differential scanning calorimeter (DSC). The carbon nanotubes, that were ball milled during 20 min to the MgH2, were observed in the scanning electron microscopy (SEM) images. The mixture of MgH2-CNT turned out to enhance the hydrogen sorption when compared to pure MgH2 and in 5 min it desorbed around 5 wt% of hydrogen, at 350oC and 0.1 bar.

研究表明，当与氢化镁（magnesium hydride, MgH₂）复配使用时，碳纳米管（carbon nanotubes, CNTs）可作为氢气扩散通道。本研究的核心目标为探究MgH₂与5wt%多壁碳纳米管（multiwalled carbon nanotubes）混合物的吸放氢性能。实验采用X射线衍射（X-ray diffraction, XRD）对样品进行表征，并通过差示扫描量热仪（differential scanning calorimeter, DSC）开展测试分析。与MgH₂一同球磨20分钟的碳纳米管，可在扫描电子显微镜（scanning electron microscopy, SEM）图像中被观测到。相较于纯MgH₂，MgH₂-碳纳米管混合物的吸放氢性能得到显著提升：在350℃、0.1 bar的条件下，其仅用5分钟即可脱附约5wt%的氢气。