Sun Ze, Lu Xiong, Nyahuma Farai Michael, Yan Nianhua, Xiao Jiankun, Su Shichuan, Zhang Liuting
College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, China.
Front Chem. 2020 Jul 2;8:552. doi: 10.3389/fchem.2020.00552. eCollection 2020.
Magnesium hydride (MgH) has attracted intense attention worldwide as solid state hydrogen storage materials due to its advantages of high hydrogen capacity, good reversibility, and low cost. However, high thermodynamic stability and slow kinetics of MgH has limited its practical application. We reviewed the recent development in improving the sorption kinetics of MgH and discovered that transition metals and their alloys have been extensively researched to enhance the de/hydrogenation performance of MgH. In addition, to maintain the cycling property during the de/hydrogenation process, carbon materials (graphene, carbon nanotubes, and other materials) have been proved to possess excellent effect. In this work, we introduce various categories of transition metals and their alloys to MgH, focusing on their catalytic effect on improving the hydrogen de/absorption performance of MgH. Besides, carbon materials together with transition metals and their alloys are also summarized in this study, which show better hydrogen storage performance. Finally, the existing problems and challenges of MgH as practical hydrogen storage materials are analyzed and possible solutions are also proposed.
氢化镁（MgH）作为固态储氢材料，因其储氢容量高、可逆性好、成本低等优点而备受全球关注。然而，MgH的高热力学稳定性和缓慢的动力学限制了其实际应用。我们综述了近年来改善MgH吸附动力学的研究进展，发现过渡金属及其合金已被广泛研究以提高MgH的脱氢/加氢性能。此外，为了在脱氢/加氢过程中保持循环性能，碳材料（石墨烯、碳纳米管等材料）已被证明具有优异的效果。在这项工作中，我们将各类过渡金属及其合金引入到MgH中，重点关注它们对改善MgH氢脱附/吸收性能的催化作用。此外，本研究还总结了碳材料与过渡金属及其合金，它们表现出更好的储氢性能。最后，分析了MgH作为实际储氢材料存在的问题和挑战，并提出了可能的解决方案。
