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先采用感应熔炼法制备SrAl2合金,然后采用机械球磨方法分别添加摩尔分数为x=2%的TiF3、Ti及TiO2催化剂,从而得到不同Ti基催化剂添加的Zintl相合金SrAl2;并将未添加催化剂的SrAl2合金用于对比研究。采用XRD、SEM、EDS、PCT及XPS设备研究了材料的相结构、表面形貌、吸氢性能与催化机理。研究表明:3种Ti基催化剂对Zintl相合金SrAl2的吸氢均能起到催化作用,催化强弱次序如下:TiF3>Ti>TiO2。对添加Ti基催化剂的SrAl2合金吸氢前后的表面XPS研究分析表明:合金表面Ti 2p电子的结合能发生了改变,说明其化学状态发生了变化。特别是添加了TiF3的合金样品中出现了单质Ti0,这种在反应过程中生成的中间产物Ti0要比刚开始在合金中加入的单质Ti具有更高的催化活性。
First, SrAl2 alloy was prepared by induction melting method and then TiF3, Ti and TiO2 catalysts with mole fraction x = 2% were respectively added by mechanical ball milling to obtain SrAl2 alloy with Zintl phase added with different Ti-based catalysts; SrAl2 alloy for comparative study. The phase structure, surface morphology, hydrogen absorption properties and catalytic mechanism of the materials were investigated by XRD, SEM, EDS, PCT and XPS equipment. The results show that all three kinds of Ti-based catalysts can catalyze the hydrogen absorption of SrAl2 in Zintl phase. The order of catalytic activity is as follows: TiF3> Ti> TiO2. The XPS study of SrAl2 alloy with Ti-based catalyst before and after hydrogen addition showed that the binding energy of Ti2p electron on the alloy surface changed, indicating that the chemical state of SrAl2 alloy changed. In particular, the addition of TiF3 alloy sample elemental Ti0 appeared, this reaction generated during the intermediate product Ti0 than the beginning of the alloy added to the elemental Ti has a higher catalytic activity.