通过球磨方法制备出2LiBH4-MgH2,2LiBH4-MgH2-10%Fe2O3,2LiBH4-MgH2-10%TiF3,2LiBH4-MgH2-5%Fe2O3-5%TiF3和2LiBH4-MgH2-10%Fe2O3-10%TiF35个复合氢化物体系,用热重(TG)、差示扫描量热(DSC)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和压力-组成-温度仪(PCT)等对所制备体系进行表征.结果表明,Fe2O3和TiF3的掺杂均能够有效地改善2LiBH4-MgH2复合体系的放氢性能,尤其是两者共掺杂的2LiBH4-MgH2-10%Fe2O3-10%TiF3体系,初始放氢温度为110℃,总放氢量达到约9.6%.对2LiBH4-MgH2-5%Fe2O3-5%TiF3体系的PCT表征结果表明,在400℃时,10 min内放氢量达到了8.6%,放氢热力学和放氢动力学均优于单一相的掺杂,体现了两相掺杂的协同催化作用.
Five systems(2LiBH4-MgH2,2LiBH4-MgH2-10%Fe2O3,2LiBH4-MgH2-10%TiF3,2LiBH4-MgH2-5%Fe2O3-5%TiF3 and 2LiBH4-MgH2-10%Fe2O3-10%TiF3) were prepared by ball milling.They were investigated through thermogravimeteric analysis(TG),diffraction scanning calorimetric(DSC),powder X-ray diffraction(XRD),Fourier transformed infrared spectrometer(FTIR) and pressure-content-temperature(PCT).The addition of Fe2O3 and TiF3 improved the hydrogen release property of the LiBH4-MgH2 complex system effectively.Especially,the codoped system(2LiBH4-MgH2-10%Fe2O3-10%TiF3) starts to release hydrogen at around 110 ℃ and can release as much as 9.6%.Besides,the results of PCT show that the codoped system(2LiBH4-MgH2-5%Fe2O3-5%TiF3) can release about 8.6% hydrogen within 10 min at 400 ℃.The properties of the codoped system are better than the other two single doped systems,which partly incarnated the synergistic catalysis of Fe2O3 and TiF3.