Effects of Mn and Co Addition on Hydrogen Storage Properties of V₈₀Ti₈Cr₁₂ Alloy

Effects of of Mn and Co addition on hydrogen-storage microstructure and properties of V₈₀Ti_8-x-yCr₁₂Mn_xCo_y （x = 0,1,2,3; y = 0,0. 1,0. 2,0. 4,0. 8,1. 0） alloy have been investigated. The results show that these alloys are determined as a single bcc phase. With the increase of Mn addition,the lattice parameters of bcc main phase and the plateau slope factor of alloys are reduced,the plateau pressure isincreased,and the residual amount of hydrogen of alloys is decreased. However,the hydrogen absorption capacity and desorption capacity are decreased. Based on this alloy,With the increase of Co addition,the plateau pressure of alloys is improved,the plateau slope factor is reduced and the maximum capacity and effective capacity of hydrogen storage are raised and then? decreased. While the effective desorption capacities maintain more than 2. 2%. When y = 0. 2at%,the alloy shows the maximum hydrogen absorption capacity of 3. 81% at 273 K and the effective desorption capacities of 2. 45%,with a plateau pressure of 0. 68 MPa at 318 K. The V₈₀Ti_6.8Cr₁₂Mn₁Co_0.2 alloy shows good short-term cycle durability with the effective desorption capacities of 2. 38% after the fifth cycle.