![]() In promising alloy systems, rare earth-based alloys show excellent potential as they possess favourable room temperature reversible hydrogen absorption/desorption properties and long-term cycling stability ( Dashbabu et al., 2022 Lv et al., 2022), but are more restricted to Ni-MH battery applications due to their low hydrogen storage capacity ( Liu et al., 2004). Researches on these materials have focused on the development of potential candidates with improved bulk and weight capacities, kinetics of rapid hydrogen desorption, and long-term cycling stability ( Rusman and Dahari, 2016). ![]() Metal hydride, utilising a reversible chemical interaction of hydride-forming alloys, is the primary focus of the solid-state hydrogen storage community. Solid-state storage techniques in the form of metal hydrides with high volumetric hydrogen density and security have appeared as attractive alternatives ( Kumar et al., 2022). Liquid hydrogen, despite its high energy load, requires extremely high maintenance power and is therefore more limited to aerospace applications ( Usman, 2022). Storing hydrogen via high-pressure tanks (∼70 MPa) is currently the most commercially mature method available, but the accompanying safety hazards cannot be ignored ( Rohit et al., 2022). ![]() Hydrogen storage can be realized in the state of gas, liquid or solid. With the number of policies and projects regarding the hydrogen energy industry expanding rapidly, the safe and efficient hydrogen storage technology has become an essential challenge towards the application of hydrogen at scale. The hydrogen energy industry chain can be broadly categorised into three parts: hydrogen production, hydrogen storage and transportation, hydrogen application. The development of the hydrogen energy industry will serve as crucial strategic pillars in driving the global energy transition and meeting decarbonization targets ( Lebrouhi et al., 2022 Zhao et al., 2022). Moreover, the possible application scenarios and future research directions are analysed.Īs an ideal energy carrier and secondary clean energy source, hydrogen shows great prospective in the fields of transportation, industrial fuel and power energy storage owing to its high combustion calorific value and non-polluting characteristics ( Lebrouhi et al., 2022). In this review, we combed through the definition and criteria of high entropy alloys, and summarized the current research status of body-centred cubic-structured high entropy alloys for hydrogen storage from multiple perspectives of composition designs, synthesis processes, and hydrogen storage properties. Its novel design concept provides more possibilities for the investigation of advanced hydrogen storage materials, in which several remarkable research works have been published, providing opportunities for the design of hydrogen storage materials with unprecedented properties. Recently, high entropy alloys (HEAs) with body-centred cubic (BCC) single phase structures have attracted wide attention in many fields including hydrogen storage, due to their unique structural characteristics and excellent performance.
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