Improved hydrogen storage properties of Ti2CrV alloy by Mo substitutional doping

Effect of La Doping on Kinetic and Thermodynamic Performances of Ti1.2CrMn Alloy upon De/Hydrogenation

“…When the addition amount of La is 1 wt %, there is no obvious La enrichment in the alloy. A lot of studies conclude that the improvement of the compositional homogeneity of the alloy is conducive to enhancing the hydrogen storage properties. ,, The addition of 1 wt % La does not affect the homogeneous composition (Figure ) and phase structure (Figure ) of the alloy, and 1 wt % La is selected as the optimum doping content.…”

“…Currently, the effective hydrogen storage capacity of the widely developed AB 5 -type alloys does not exceed 1.4 wt %. , Body-centered-cubic alloys intrinsically contain higher capacities, i.e., nearly 2.4 wt %, but they have not been used for any application so far because of the high cost, difficulties in activation, and the slope in the pressure–composition–temperature (PCT) curve. , Recently, researchers found that several high-capacity materials, such as MgH 2 , AlH 3 , and other complex hydrides, have shown storage capacities of above 5 wt %. − However, the poor kinetics and great enthalpy change of the desorption reaction greatly hinder the practical storage application. , Numerous efforts were reported to enhance the kinetics and reduce the stability of the hydrides, such as catalysis, substitution, and nanoconfinement. − …”

“… 11 , 12 Body-centered-cubic alloys intrinsically contain higher capacities, i.e., nearly 2.4 wt %, but they have not been used for any application so far because of the high cost, difficulties in activation, and the slope in the pressure–composition–temperature (PCT) curve. 13 , 14 Recently, researchers found that several high-capacity materials, such as MgH 2 , AlH 3 , and other complex hydrides, have shown storage capacities of above 5 wt %. 15 − 19 However, the poor kinetics and great enthalpy change of the desorption reaction greatly hinder the practical storage application.…”

A review on BCC-structured high-entropy alloys for hydrogen storage

“…In this work, the effective hydrogen storage is even lower than 50% of the maximum hydrogen absorption, the mechanism of which remains to be uncovered. Hu et al (2022) synthesized Ti 1.5 Mo 0.5 CrV alloy by Mo substitution of Ti with better cyclic stability than Ti 2 CrV which showed nearly half loss of hydrogen absorption at the beginning of cycling (as shown in Figure 6C). The authors suggested that Mo doping could stabilize the crystal structure of the alloy to avoid serious lattice defects and deformation after hydrogen absorption and desorption, and achieve the purpose of stabilizing the cyclic performance of the alloy.…”

“…Currently, BCC-structured HEAs show excellent hydrogen storage properties such as high hydrogen capacity, fast kinetics, high Hydrogen capacity of Ti 2 VCr alloy for 10 cycles at room temperature (the alloy is heated at 673 K under diffusion vacuum before each cycle) (A) (Kumar et al, 2011); hydrogen absorption curve of V 0.3 Ti 0.3 Cr 0.25 Mn 0.1 Nb 0.05 alloy within 5 cycles (B) (Liu et al, 2022b); comparison of cycling performance of Ti2VCr alloy before and after chemical modification (Mo instead of Ti) (C) (Hu et al, 2022).…”