A Review on Magnesium Based Metal Hydrides for Thermal Energy Storage Systems

ABSTRACT The hydrogen storage in metal hydrides is an imminent, innovative, and environmentally beneficial approach that offers benefits for example, an ample amount of storage and elasticity in terms of thermodynamics necessary for hydrogen absorption and release. By successfully integrating temperature management with hydrogen storage procedures, thermal energy storage (TES) systems offer a way to improve the energy efficiency and economic viability of metal hydride‐based storage. This review presents an overview of metal hydride materials utilized for storing hydrogen, emphasizing their thermodynamic and kinetic characteristics. This study examines TES materials, focusing on sensible, latent, and thermochemical energy storage options, particularly those functioning at temperatures suitable for extensively researched hydride systems. An analysis of lanthanum and magnesium‐based metal hydride is presented. Additionally, the study presents a comprehensive review that yields additional combinations of magnesium‐based and lanthanum‐based metal hydrides, elucidating their properties, which encompass the ranges of absorption and desorption temperatures, as well as gravimetric storage capacity. The study concludes that the kinetics of both absorption and desorption are enhanced; in the case of magnesium‐based metal hydrides at elevated temperatures (MgH 2 –7 wt% Fe−7 wt% HCS and MgH 2 @Ni‐MOF) exhibit the highest absorption and desorption temperatures. This study provides a greater understanding to researchers in developing efficient materials for hydrogen storage and can identify patterns in various alloys, including the influence of alloy composition on thermodynamic properties and can screen alloys with desirable properties for various applications.