Hydrogen storage and cyclic properties of V_(60)Ti_((21.4+x))Cr_((6.6-x))Fe_(12) (0 ≤x≤ 3) alloys

摘要

Hydrogen storage and cyclic properties of V_(60)Ti_((21.4+x))Cr_((6.6-x))Fe_(12) (0 ≤ x ≤ 3) alloys were investigated systematically. All alloys were composed of single BCC phase and exhibited good activation performance. V_(60)Ti_(22.4)Cr_(5.6)Fe_(12) showed the highest desorption capacity of 2.12 wt% with the plateau pressure of 0.061 MPa. In the absorption-desorption cycle tests, both the hydrogen desorption capacity and the micro-strain of V_(60)Ti_(22.4)Cr_(5.6)Fe_(12) alloy showed exponential relationship with the increase of cycle numbers, which indicated that the micro-strain induced and thereafter accumulated during the absorption-desorption cycles might lead to the decrease of the desorption capacity.