Microstructure and hydrogen storage properties of Ti–V–Cr based BCC-type high entropy alloys

High-entropy hydrides for fast and reversible hydrogen storage at room temperature: Binding-energy engineering via first-principles calculations and experiments

“…HEAs are the most recent alloys which have been explored for hydrogen storage [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. The presence of multi-principal elements in the lattice of these alloys makes it possible to tune their electronic structures, crystal structures and physical properties in a much more straightforward way as compared to conventional alloys and intermetallics [7].…”

“…The presence of several elements in a single phase allows to manipulate the electronic structure, hydrogen binding energy and accordingly hydrogen storage temperature and pressure by careful selection of principal elements and their concentrations [7]. TiVZrNbHf [8][9][10], TiVCrNbMo [8], TiVCrNbTa [8], Ti0.2Zr0.2Hf0.2Mo0.1Nb0.3 [11], Ti0.2Zr0.2Hf0.2Mo0.2Nb0.2 [11], Ti0.2Zr0.2Hf0.2Mo0.3Nb0.1 [11], TiZrVNbCr [12], V30Ti30Cr25Fe10Nb5 [13], V35Ti30Cr25Fe5Mn5 [13], Mg0.10Ti0.30V0.25Zr0.10Nb0.25 [14], TiZrNbFeNi [15], TiZrNbCrFe [16], MgAlTiFeNi [17], Al0.10Ti0.30V0.25Zr0.10Nb0.25 [18], Mg12Al11Ti33Mn11Nb33 [19], MgVAlCrNi [20], MgVTiCrFe [21], AlCrFeMnNiW [22], TiZrHfScMo [23], MgZrTiFe0.5Co0.5Ni0.5 [24] and LaNiFeVMn [25] are some of the HEAs which have been investigated for hydrogen storage. However, as discussed in a recent review paper [7], these HEAs have drawbacks such as either high-temperature requirement for hydrogen storage, poor hydrogen storage reversibility, poor activation, or high storage pressure [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]…”

“…TiVZrNbHf [8][9][10], TiVCrNbMo [8], TiVCrNbTa [8], Ti0.2Zr0.2Hf0.2Mo0.1Nb0.3 [11], Ti0.2Zr0.2Hf0.2Mo0.2Nb0.2 [11], Ti0.2Zr0.2Hf0.2Mo0.3Nb0.1 [11], TiZrVNbCr [12], V30Ti30Cr25Fe10Nb5 [13], V35Ti30Cr25Fe5Mn5 [13], Mg0.10Ti0.30V0.25Zr0.10Nb0.25 [14], TiZrNbFeNi [15], TiZrNbCrFe [16], MgAlTiFeNi [17], Al0.10Ti0.30V0.25Zr0.10Nb0.25 [18], Mg12Al11Ti33Mn11Nb33 [19], MgVAlCrNi [20], MgVTiCrFe [21], AlCrFeMnNiW [22], TiZrHfScMo [23], MgZrTiFe0.5Co0.5Ni0.5 [24] and LaNiFeVMn [25] are some of the HEAs which have been investigated for hydrogen storage. However, as discussed in a recent review paper [7], these HEAs have drawbacks such as either high-temperature requirement for hydrogen storage, poor hydrogen storage reversibility, poor activation, or high storage pressure [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], which limit their applications. Although the research on high-entropy hydrogen storage materials is still in its early stages, designing these alloys by theoretical and com...…”

Microstructure and First Hydrogenation Properties of TiHfZrNb1−xV1+x Alloy for x = 0, 0.1, 0.2, 0.4, 0.6 and 1

“…The Fe-free alloy CrMnTiVZr showed the highest maximum capacity of 2.23 wt.% at 5 °C [ 7 ]. The alloys V 35 Ti 30 Cr 25 Mn 10 , V 35 Ti 30 Cr 25 Fe 5 Mn 5 , and V 35 Ti 30 Cr 25 Fe 10 were studied by Liu et al [ 8 ]. The samples had mainly a body-centered cubic (BCC) structure.…”

“…The samples had mainly a body-centered cubic (BCC) structure. The V 35 Ti 30 Cr 25 Mn 10 readily absorbed hydrogen at room temperature after heating at 100 °C, but the other alloys showed an incubation time [ 8 ]. Yang et al systematically studied the (VFe) 60 (TiCrCo) 40−x Zr x alloys for x = 0, 1, and 2 [ 9 ].…”