铟对MgH2脱氢性能的影响

将MgH2和In的混合粉末在行星式球磨机上进行球磨,制备了一种Mg H2-In的复合物。利用XRD分析了复合物的相组成以及吸放氢过程中的相转变;用气相色谱仪和差示扫描量热仪测定了复合物的脱氢性能和相转变温度,并用基于Sievert原理的全自动气体吸附仪测定了复合物的吸放氢热力学和动力学性能。结果表明,脱氢过程中Mg3In和Mg(In)固溶体的形成使Mg H2的脱氢反应焓和激活能显著降低,从而降低了Mg H2的脱氢温度,并显著改善了动力学性能。

Effects of Indium on the Dehydriding Properties of MgH2

A kind composite of MgH2-In was prepared by ball milling the powder mixtures of MgH2 and In on a planetary mill. XRD was used to analyze the phases and phase transition during hydriding/dehydriding process of the composite. The dehydriding properties and phase transition temperature of the composite were investigated by DSC and GC (Gas Chromatograph). The thermodynamic and kinetic properties of hydrogenation/dehydrogenation of the composite were measured by the automatic gas adsorption instrument based on Sievert principle. The results indicate that the enthalpy and activation energy of hydrogen desorption of MgH2 are significantly reduced due to the formation of Mg3In and Mg(In) solid solution during the dehydriding process. Thus the dehydriding temperature of MgH2 is decreased, and the kinetics is greatly improved