（Ti0．1V0．9）1-xFex（x=0～0．06）合金的相结构及储氢性能

The phase structures and hydrogen storage properties of (Ti_(0.1)V_(0.9))_(1-x)Fe_x(x=0～0.06) alloys

系统研究了(Ti0.1V0.9)1-xFex(x=0、0.02、0.04、0.06)合金的相结构及其储氢性能。XRD及SEM分析表明,所有合金均由单一的体心立方(BCC)结构的钒基固溶体相组成;随着Fe含量的增加,合金的点阵常数呈线性递减,晶胞体积也随之逐渐降低。储氢性能测试表明,该系列合金的动力学性能均比较好,在10℃和4MPa初始氢压条件下,合金无需氢化孕育期就能吸氢。随着Fe含量从x=0增加至x=0.06,合金的活化性能得到改善;10℃最大吸氢量则从509.5ml/g逐渐降至424.8ml/g;而50℃有效放氢量先升后降,并在x=0.04时达到最高值255.6ml/g。在所研究的合金中,Ti0.096V0.864Fe0.04合金具有最佳的综合性能,经2次吸放氢循环即可活化,10℃最大吸氢量为494.5ml/g,50℃有效放氢量达到255.6ml/g。

The phase structures and hydrogen storage properties of （Ti0.1V0.9）1-xFex（x = 0, 0.02, 0.04, 0.06） alloys were investigated systematically. The XRD and SEM analysis show that all of the alloys consist of a single Vanadium-based solid-solution phase with BCC structure. As the Fe content increased, the lattice parameter descends linearly, the unit cell volume also decreases. It is found that all of these alloys have good kinetics behaviors, they can absorb hydrogen without any hydrogenation gestation time at 10℃ and under 4MPa initial hydrogen pressure. As the Fe content increases from 0 to 0.06, the activation property of the alloys is improved, the maximum hydrogen absorption capacity at 10℃ decreases from 509.5ml/g to 424.8ml/g, and the effective hydrogen desorption capacity increases first and then decreases, while the maximum value of 255.6ml/g is obtained at x=0.04. Among these alloys studied, Ti0.096V0.864Fe0.04 alloy has a good overall property, such as the activation number of 2 cycles, the maximum hydrogen absorption capacity of 494.5 ml/g. and the effective hydrogen desorption capacity of 255.6ml/g.