Hydrogen storage in solids of hydrides is advantageous in comparison to gaseous or liquid storage. Magnesium based materials are being studies for solid-state hydrogen storage due to their advantages of high volumetric and gravimetric hydrogen storage capacity. However, unfavorable thermodynamic and kinetic barriers hinder its practical application. In this work, we presented that kinetics of Mg-based composites were significantly improved during high energy ball milling in presence of various types of carbon, including plasma carbon produced by plasma-reforming of hydrocarbons, activated carbon, and carbon nanotubes. The improvement of the kinetics and de-/re-hydrogenation performance of MgH₂ and TiC-catalysed MgH₂ by introduction of carbon are strongly dependent on the milling time, amount of carbon and carbon structure. The lowest dehydrogenation temperature was observed at 180 °C by the plasma carbon–modified MgH₂/TiC. We found that nanoconfinement of carbon structures stabilised Mg-based nanocomposites and hinders the nanoparticles growth and agglomeration. Plasma carbon was found to show better effects than the other two carbon structures because the plasma carbon contained both few layer graphene sheets that served as an active dispersion matrix and amorphous activated carbons that promoted the spill-over effect of TiC catalysed MgH₂. The strategy in enhancing the kinetics and thermodynamics of Mg-based composites is leading to a better design of metal hydride composites for hydrogen storage.

与气体或液体储存相比，氢化物固体中的氢储存是有利的。由于镁基材料具有高体积和重量氢存储容量的优势，因此正在研究固态氢存储。但是，不利的热力学和动力学障碍阻碍了其实际应用。在这项工作中，我们提出了在各种类型的碳（包括通过碳氢化合物，活性炭和碳纳米管的等离子重整产生的等离子碳）存在下的高能球磨过程中，镁基复合材料的动力学得到了显着改善。MgH ₂和TiC催化的MgH ₂的动力学和脱氢/再氢化性能的提高碳的引入在很大程度上取决于研磨时间，碳含量和碳结构。血浆碳改性的MgH ₂ / TiC观察到最低的脱氢温度为180°C 。我们发现碳结构的纳米约束稳定了基于Mg的纳米复合材料，并阻碍了纳米颗粒的生长和团聚。发现等离子体碳显示出比其他两种碳结构更好的效果，因为等离子体碳既包含用作活性分散基质的几层石墨烯片，又包含促进TiC催化的MgH ₂溢出效应的无定形活性炭。。增强镁基复合材料的动力学和热力学的策略正在导致用于储氢的金属氢化物复合材料的更好设计。