TiFe_(0.9-x)Ni_xZr_(0.1)Mn_(0.2)(x=0.1,0.2,0.3,0.4)合金的贮氢性能研究

Investigation on hydrogen storage properties of TiFe_(0.9-x)Ni_xZr_(0.1)Mn_(0.2)(x=0.1,0.2,0.3,0.4)alloys

采用高频感应熔炼法制备TiFe0.9-xNixZr0.1Mn0.2（x=0.1,0.2,0.3,0.4）合金,系统地研究Ni部分取代Fe对TiFe0.9-xNixZr0.1Mn0.2（x=0.1,0.2,0.3,0.4）合金相组成与贮氢性能的影响。XRD分析结果表明：合金主要由NiTi,FeTi和（Fe,Ni）相组成,在x=0.1~0.2时,有少量的FeZr2相,随着Ni含量的增加,FeZr2相消失,同时有TiMn2相产生。压强—成分—温度（PCT）测试结果表明,TiFe0.6Ni0.3Zr0.1Mn0.2合金的贮氢量最高,其吸氢量为1.46 wt%。电化学测试结果显示,合金电极放电容量随着Ni含量的增加而增大,TiFe0.8Ni0.1Zr0.1Mn0.2合金的放电容量为34 mAh/g,而TiFe0.5Ni0.4Zr0.1Mn0.2合金电极的放电容量则达156 mAh/g。

Hydrogen storage alloys TiFe0.9-xNixZr0.1Mn0.2（x=0.1,0.2,0.3,0.4）were prepared by induction melting under argon atmosphere,the effects of Ni substitution for Fe on the hydrogen storage and electrochemical properties were investigated systematically by pressure-composition-temperature（P-C-T）and electrochemical measurements.X-ray diffraction（XRD）results showed that all the alloys mainly consist of NiTi,FeTi and（Fe,Ni） phases.There were some FeZr2 phase in the alloys when x=0.1~0.2 and it disappeared while a new phase of TiMn2 generated with the increasing of Ni content.The pressure-composition-temperature（PCT） testing results show that TiFe0.6Ni0.3Zr0.1Mn0.2 alloy has the best hydrogen storage capacity and the maximum amount of absorbed hydrogen was measured to be about 1.46 wt%;it was also found that the electrochemical capacity increases with the increase of Ni content.And the discharge capacity of TiFe0.8Ni0.1Zr0.1Mn0.2 alloy electrode was 34 mAh/g while that of the TiFe0.5Ni0.4Zr0.1Mn0.2 sample was 156 mAh/g.