In this paper, the effect of intermetallic compounds Zr₂Fe and Zr₇Ni₁₀ on the microstructure and first hydrogenation kinetic of TiCr_1.1V_0.9 alloy is reported. Samples were synthesized by arc melting separately and then 5% of each intermetallic was co-melt with TiCr_1.1V_0.9 alloy. First hydrogenation of all alloys was performed at room temperature under 2.0 MPa of hydrogen. Kinetics and absorption capacities were measured at room temperature, by using apparatus type sieverts. Results indicate that the addition of the intermetallic has an enhancing effect on the kinetic reaction without further modification of hydrogen storage capacities, going from 3.6 wt.% for as-cast alloy, to 3.61 wt.% for alloys +5 wt.% intermetallic. On the other hand, the structure and microstructural analysis were carried out by X-ray diffraction and scanning electron microscopy, respectively. These results show conservation of the structure in the body-centered cubic, and two additional minor phase formations: C14 laves phase for both alloys, and an additional Ti₂Ni phase for the TiCr_1.1V_0.9 + 5% Zr₇Ni₁₀ alloy. Finally, the thermal stabilization of the sample was determined by using differential scanning calorimetry. The results show two types of hydrides that form trapped in different clamping sites with different energies.

This study investigates the microstructure and first hydrogenation properties of Fe₅₂Ti₄₀Zr₃V₅ and Fe₃₇Ti₄₄Zr₉V₁₀ alloys, which are individual phases present in the as-cast TiFe + 12 wt.% ZrV₂ alloy (parent alloy). The parent alloy exhibited fast first hydrogenation kinetics due to the interplay of these two phases. Our objective is to study the hydrogen storage behavior of these individual phases. The samples were synthesized by arc melting and characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. The results show that when these alloys are melted separately, they do not exhibit the same phase composition as in the parent alloy, indicating a metastable state under our synthesis conditions, which significantly impacts their hydrogen storage behavior. Hydrogenation capacity was measured using a homemade Sieverts apparatus. Both alloys demonstrated excellent first hydrogenation kinetics, with an absorption capacity of 0.9 wt.% for the Fe₅₂Ti₄₀Zr₃V₅ alloy and 2.3 wt.% for Fe₃₇Ti₄₄Zr₉V₁₀ alloy. Our key finding is that the final crystal structure of multi-element alloys is highly dependent on the synthesis method.

Metal hydrides are considered an easy and safe way to store hydrogen. Storage is one of the keys to the large-scale implementation of the so-called hydrogen economy, which will undoubtedly revolutionize the new vision of sustainable development towards a more environmentally friendly world. This paper presents a general review of some alloys based on TiCrV and TiCrVZr showing their advantages and challenges that must be developed for their implementation. The capacity of absorption and desorption as a function of time is shown using a Sieverts type device, the structure is studied by means of X-ray diffraction as well as its morphology by means of scanning electron microscopy. This paper shows the advantages and disadvantages of alloy synthesis methods based on transition metals, it is observed that hydrogen capacity increases in the process of fusion synthesis and decreases in the process by mechanical grinding, however the capacity desorption is not optimal at room temperature.