![]() The basic principle of HEAs is based on high-mixing or configurational entropy which can stabilize the single phase in multicomponent system (Mukhopadhyay 2015). In contrast to typical conventional alloys, which are based on a single principal element, HEAs contain at least five or more principal elements, each with a concentration of 5–35 (at. It is interesting to mention that in the multi-principal element alloys, the high-mixing entropy (also known as configurational entropy) could play an important role in reducing the number of phases in the higher-order multicomponent alloys, thereby improving the material's properties. The single-phase multi-principal element alloys were also proposed by Huang and Yeh ( 1996) independently and this ground-breaking concept was advocated on the exploration of HEAs. They mixed several components in equal proportions and discovered that Fe 20Cr 20Ni 20Mn 20Co 20 composition formed a single face-centered cubic (FCC) phase, as well as a wide range of equi-atomic multi-component alloys with six to nine elements, now known as the Cantor alloy. In 1981, Brian Cantor with his student Alain Vincent conducted the first research in the area of multi-component alloys and summarized the findings in the undergraduate project thesis (Vincent 1981). ( 2004) and Ranganathan ( 2003) reported independently their own research and initiated the area of multicomponent high-entropy alloys. It is emerging as a new class of structural and functional materials and has attracted intense attention in recent years (Yadav et al. Multicomponent high-entropy alloys (HEAs) seem to have appeared to be one of the most promising materials because of its excellent mechanical, thermal and oxidation properties compared to that of pure metals and conventional alloys (Murty et al. The prospects of high-entropy-based alloys for hydrogen storage will be discussed. ![]() From the preliminary investigation, the maximum storage capacity in this system was observed to be 1.78 wt%, which is comparable to other hydrogen storage materials. ![]() Furthermore, we will also present some of our work on the synthesis, structural–microstructural characterization and hydrogen storage properties of Ti–Zr–V–Cr–Ni equi-atomic hydride-forming high-entropy alloys. Here, attempts will be made to present a short review on utilization of multicomponent high-entropy alloys as solid hydrogen storage materials. Hydride-forming elements like Ti, Zr, V, Nb, Hf, Ta, La, Ce, Ni, and others have been shown to have hydrogen storage properties and the ability to produce single-phase high-entropy intermetallics. Multicomponent alloys consisting of five or more principal elements, also known as high-entropy alloys appear to have potential for the development as hydrogen storage materials. The hydride-forming alloys and intermetallic compounds are found to be the most important families of hydrogen storage materials. It is therefore, worthwhile to look into the experimental and theoretical research on prospective hydrogen storage materials. However, hydrogen can be stored in solid materials with higher concentration of hydrogen compared to the gaseous and liquid hydrogen storage systems. To store hydrogen with a high gravimetric/volumetric density, gaseous hydrogen storage systems require a very high-pressure compressed gas cylinder which is quite unsafe and the storage in the liquid form needs cryogenic containers to be maintained at roughly 20 K under ambient pressure because hydrogen has a very low critical temperature of 33 K. ![]() Hydrogen storage is one of the most significant research areas for exploiting hydrogen energy economy. ![]()
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