Thermal storage properties of Mg with synergistic effect of LaNi and TiH_(2)  

作　　者：Qi Wan Li-Jun Jiang Zhi-Nian Li Yang Yang Shu-Mao Wang Xiao-Peng Liu 

机构地区：[1]Energy Material and Technology Research Institute,General Research Institute for Nonferrous Metals,Beijing,100088,China

出　　处：《Rare Metals》2023年第5期1743-1751,共9页稀有金属（英文版）

基　　金：financially supported by the Beijing Municipal Commission of Science and Technology of China(D141100002014001)。

摘　　要：The effect of LaNi and Ti on thermal storage properties of MgH_(2)was investigated.The thermal storage performances of Mg are significantly improved by adding LaNi and Ti.The pressure-composition-temperature(PCT)curves indicate that the formation enthalpy for Mg-15 wt%Ti-5 wt%LaNi sample is 73.00 kJ·mol^(-1),which approaches to the theoretical values of pure MgH_(2).The isothermal measurement indicates that,for the Mg-15wt%Ti-5 wt%LaNi,the first absorption reaction fraction within 2 min is 93.77%,increasing by 0.32%,0.24%and0.08%compared with those for Mg,Mg-5 wt%LaNi and Mg-15 wt%Ti,respectively.The first desorption reaction fraction within 2 min is 73.18%,increasing by 55.91%,9.79%and 8.12%compared with those for Mg,Mg-5wt%LaNi and Mg-15 wt%Ti,respectively.Moreover,Mg-15 wt%Ti-5 wt%LaNi has the best cyclic stability in all the samples.The thermal storage performances of Mg by adding both LaNi and Ti are improved mainly ascribed to synergistic effect of in situ formed La_(4)H_(12.19),Mg_(2)NiH_(4),H_(0.3)Mg_(2)Ni and TiH_(2)particles during cyclic process.The above analysis demonstrates that Mg-15 wt%Ti-5wt%LaNi is suitable for using as a heat storage material.

关 键 词：Thermal storage Magnesium hydride Thermodynamic property Kinetics performances Cyclic stability 

分 类 号：TG139.7[一般工业技术—材料科学与工程]