Recent progress in thermodynamic and kinetics modification of magnesium hydride hydrogen storage materials

Abstract

Hydrogen energy has emerged as a pivotal solution to address the global energy crisis and pave the way for a cleaner, low-carbon, secure, and efficient modern energy system. A key imperative in the utilization of hydrogen energy lies in the development of high-performance hydrogen storage materials. Magnesium-based hydrogen storage materials exhibit remarkable advantages, including high hydrogen storage density, cost-effectiveness, and abundant magnesium resources, making them highly promising for the hydrogen energy sector. Nonetheless, practical applications of magnesium hydride for hydrogen storage face significant challenges, primarily due to their slow kinetics and stable thermodynamic properties. Herein, we briefly summarize the thermodynamic and kinetic properties of MgH₂, encompassing strategies such as alloying, nanoscaling, catalyst doping, and composite system construction to enhance its hydrogen storage performance. Notably, nanoscaling and catalyst doping have emerged as more effective modification strategies. The discussion focuses on the thermodynamic changes induced by nanoscaling and the kinetic enhancements resulting from catalyst doping. Particular emphasis lies in the synergistic improvement strategy of incorporating nanocatalysts with confinement materials, and we revisit typical works on the multi-strategy optimization of MgH₂. In conclusion, we conduct an analysis of outstanding challenges and issues, followed by presenting future research and development prospects for MgH₂ as hydrogen storage materials.