Effect of Al on hydrogen storage properties of V30Ti35Cr25Fe10 alloy

The effect of 0.6–5 at.% Al on the structure and hydrogen storage properties of V30Ti35Cr25Fe10 hydrogen storage alloy was investigated by XRD and PCT measurement. It was found by XRD analysis and Reitveld method that all Al-containing alloys are single phases with BCC structures, and with the addition of Al content from 0.6 to 5 at.%, the lattice parameters of the alloys become larger, the hydrogen absorption and desorption capacities decrease, the desorption plateau pressures increase, but no evident effect is found when the content of Al is no more than l at.%. The formation of γ phase is inhibited by the addition of Al, and nearly no γ phase is formed when Al content reaches 5 at.%.