Enhancing Hydrogen Storage Properties of MgH2 by Transition Metals and Carbon Materials: A Brief Review

Abstract

Magnesium hydride (MgH 2 ) 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 2 has limited its practical application. We reviewed the recent development in improving the sorption kinetics of MgH 2 and discovered that transition metals and their alloys have been extensively researched to enhance the de/hydrogenation performance of MgH 2 . 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 2 , focusing on their catalytic effect on improving the hydrogen de/absorption performance of MgH 2 . 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 2 as practical hydrogen storage materials are analyzed and possible solutions are also proposed.

Realizing Hydrogen De/Absorption Under Low Temperature for MgH2 by Doping Mn-Based Catalysts

“…Magnesium hydride (MgH 2 ) with large mass hydrogen storage capacity (7.76 wt%), natural abundance, and excellent reversibility, ignites hope for meeting the demands of practical application of high-capacity hydrogen storage [ 11 , 12 , 13 ]. Nevertheless, its high thermodynamic stability and poor kinetic properties still lie in the way of practical application [ 14 , 15 , 16 ]. To conquer the above challenges, diverse technics like nanoconfinement [ 17 , 18 , 19 , 20 , 21 , 22 ], alloying [ 23 , 24 , 25 , 26 , 27 ], and catalyst doping [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ] have been conducted over the past decades.…”

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

“…In recent years, its excellent catalytic properties have received extensive attention from scholars. [20] Yermakov et al [21] studied the hydrogen storage performance of MgÀ Fe system through mechanical activation. The specific method is to study the adsorption characteristics of MgÀ Fe mixture in the atmosphere of Ar and H 2 .…”

Magnesium-Based Materials for Hydrogen Storage—A Scope Review

“…The main research papers are broadly described in other reviews by Aldelhelm et al [ 160 ], Sun et al [ 161 ], and others [ 161 , 162 , 163 , 164 ]. Carbon materials were shown to be suitable in combination with metal hydrides due to their relative chemical inertness.…”