Thermal storage properties of Mg-LaNi using as a solar heat storage material  

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4期1363-1370,共8页稀有金属（英文版）

基　　金：financially supported by the Beijing Municipal Commission of Science and Technology of China(No.D141100002014001)。

摘　　要：The effect of LaNi on thermal storage properties of MgH2 prepared by ball milling under hydrogen atmosphere was investigated.The thermal storage properties,cyclic property and thermal storage mechanism were studied by pres sure-composition-temperature(PC T),X-ray diffraction(XRD)and transmission electron microscopy(TEM).The Van't Hoff curve indicates that the formation enthalpy of Mg-16 wt%LaNi is 74.62 kJ·mol^(-1),which approaches to the theoretical values of MgH2.The isothermal measurement indicates that Mg-16 wt%LaNi can absorb 6.263 wt%H_(2)within 30 min at 390℃for the first absorption,the absorption reaction fraction within2 min is over 90.00%,and the desorption reaction fraction within 2 min is 72.63%,increasing by 55.36%compared with that of Mg.Mg-16 wt%LaNi has better cyclic stability than that of Mg,only decreasing by 0.609 wt%after 80cycles.The enhancement in thermal storage performances of Mg by adding LaNi is mainly ascribed to the formed Mg_(2)NiH_(4),H_(0.3)Mg_(2)Ni and La_(4)H_(12.19)during the cyclic process which act as catalysts and inhibit the growth of Mg.The above results prove that Mg-16 wt%LaNi is suitable for use as a heat storage material.

关 键 词：MAGNESIUM Thermal storage Thermodynamic property Kinetic property 

分 类 号：TB34[一般工业技术—材料科学与工程]