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

Magnesium hydride (MgH 2 ) has become a very promising hydrogen storage material because of its high hydrogen storage capacity, good reversibility and low cost. However, high thermodynamic stability and slow kinetic performance of MgH 2 limit its practical application. In the past few decades, many alternative methods have been designed to solve this problem. A large number of studies have demonstrated that the use of metal catalyst doping modification, MgH 2 nanocrystallization and other methods can greatly improve the hydrogen absorption and dehydrogenation performance of MgH 2 . Therefore, this paper reviews and summarizes the modification effect of transition metal catalyst doping on the hydrogen storage performance of MgH 2 , especially the catalysis on the de/rehydrogenation performance of MgH 2 . In addition, promoting effects of carbon materials, transition metal alloys and compounds on the hydrogen storage performance of MgH 2 were also summarized. Finally, the existing problems and challenges of MgH 2 as hydrogen storage materials are discussed, and some possible strategies are proposed.