Effects of the different element substitution on hydrogen storage properties of Ti0.8Zr0.2Mn0.9Cr0.6V0.3M0.2 (M = Fe, Ni, Co)

To solve the existing problems in the hydrogen storage properties of Ti-Cr-Mn based hydrogen storage alloys, the effects of different elements (M = Fe, Ni, Co) on the phase structure and hydrogen storage properties of Ti-Zr-Cr-Mn-V-M alloy are studied. M elements increase the plateau pressure of hydrogen absorption and desorption, and the plateau pressure of Ti0.8Zr0.2Mn0.9Cr0.6V0.3Co0.2 is the highest and that of Ti0.8Zr0.2Mn0.9Cr0.6V0.3Ni0.2 is the lowest. It is found that the substitution of Fe is very effective in improving dynamic performance and hydrogen storage capacity. Ti0.8Zr0.2Mn0.9Cr0.6V0.3Fe0.2 alloy also shows excellent plateau performance with very small hysteresis and sloping which is attributed to the interstitial size effect. Ti0.8Zr0.2Mn0.9Cr0.6V0.3Fe0.2 alloy has a hydrogen desorption pressure of 0.34 MPa at 303 K and can release 1.75 wt% hydrogen within 200 s. The material with higher mass density and lower dehydrogenation temperature can apply to hydrogen storage and hydrogen transportation.