Hydrogen absorption–desorption characteristics of Ti(0.22+X)Cr(0.28+1.5X)V(0.5−2.5X) (0≤X≤0.12) alloys

Effects of desorption temperature and substitution of Fe for Cr on the hydrogen storage properties of Ti0.32Cr0.43V0.25Ti0.32Cr0.43V0.25 alloy

“…9 shows that regardless of the Fe ratio, each curve has two endothermic peaks signifying hydrogen desorption reactions in the regions below 573 and around 773 K, respectively. As explained in the previous work [11], the endothermic peak in the low-temperature region suggests the hydrogen desorption from the residual fcc phase after the P -C isotherm measurement, while that in the high-temperature region corresponds to the hydrogen desorption from the bcc phase. The negligible effects of Fe on the hydrogen desorption from the bcc phase in the high-temperature region are in contrast with theYu et al results [16].…”

“…Recent studies by the present authors have shown the Ti 0.32 Cr 0.43 V 0.25 alloy has a long cyclic life and some other good properties for hydrogen storage [10,11]. For practical applications, however, the alloy still needs improvements on some properties: gravimetric storage density, desorption plateau pressure, materials cost, etc.…”

Hydrogenation properties and crystal structure of the single BCC (Ti0.355V0.645)100−xMx alloys with M=Mn, Fe, Co, Ni (x=7, 14 and 21)

“…Thus substitutions of Ti-V alloys by 3d transition elements have been carried out in order to improve the hydrogenation behavior. Many works have been done on the Ti-Cr-V system that shows a reversible capacity of 2.4 wt.% at room temperature [3][4][5][6][7][8][9][10] whereas other studies report on the hydrogenation behavior of Ti-V-X compounds with X = Mn, Fe, Co, Ni [11][12][13][14][15][16]. During hydrogenation, the successive formation of two hydrides is reported.…”

Effects of the ball-milling with LmNi4.1Al0.25Mn0.3Co0.65 alloy on the electrode characteristics of Ti0.32Cr0.43V0.25 alloy for Ni–MH batteries

“…Recently, Ti-Cr-V alloys with greater hydrogen storage capacity than the conventional AB 5 type alloy have been identified as a promising anode material for Ni-MH secondary batteries [11][12][13][14][15]. BCC type Ti-Cr-V alloys exhibit excellent effective hydrogen storage capacity of > 2 wt% and a proper plateau pressure in the pressure-composition (P-C) isotherm for the absorption and desorption of hydrogen, which makes it suitable as an anode material in Ni-MH batteries [11][12][13][14][15].…”

“…BCC type Ti-Cr-V alloys exhibit excellent effective hydrogen storage capacity of > 2 wt% and a proper plateau pressure in the pressure-composition (P-C) isotherm for the absorption and desorption of hydrogen, which makes it suitable as an anode material in Ni-MH batteries [11][12][13][14][15]. However, these alloys are barely activated during charging due to the formation of a dense oxide layer on the alloy in an alkaline solution [15,16].…”