Ti1.2Fe＋x%Mg（x=1,3,5）合金的贮氢特性

Hydrogen Storage Properties of Ti1.2Fe+x%Mg(x=1,3,5)alloys

摘要:

在TiFe合金中添加少量的IIA族轻金属元素Mg，并且使Ti侧过化学计量，组织Ti1.2F3 x%（质量分数，下同）Mg（x=1,3,5)试验合金，研究了该系列合金的储氢特性。结果表明，Ti1.2F3 3%Mg和Ti1.2F3 5%Mg合金在室温下，经2次吸放氢操作即能完全活化，前者的储氢量为213ml/g，且具有较小的压力滞后和平台斜率，适合作为内氢燃料电池氢源储氢材料。X射线分析发现，所有试验合金的主相均为TiFe相，而合金显微组织显示，Mg以弥散颗粒分布于合金基体，并讨论了Mg的添加和Ti过量对合金活化性能和储氢容量的影响机制。

Abstract:

The hydrogen storage properties of Ti1.2Fe+xwt%Mg(x=1,3,5) alloys have been investigated. The results show that the modified alloys can be activated at room temperature without any thermal treatment because of the addition of Mg and excess stoichiomentriy of Ti in alloys. The alloy Ti1.2Fe+3wt%Mg(Ti1.2FeMg0.12)is comparatively light in weight and has a large storage capacity,attaining 1.9wt%H2(213 ml/g),and small pressure hysteresis, so suitable for the hydrogen storage system with portable hydrogen fuel cell power. In the paper, the influence and mechanism of the addition of Mg and excessive Ti on the activation behavior and hydrogen storage capacity for the alloys have also been discussed.