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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。
The mixed powder of MgH2 and In was ball milled on a planetary ball mill to prepare a Mg H2-In composite. The phase composition of the composite and phase transition during hydrogen absorption and desorption were analyzed by XRD. The dehydrogenation properties and phase transition temperature of the composite were measured by gas chromatography and differential scanning calorimetry. Gas adsorption apparatus was used to determine the thermodynamic and kinetic properties of the complex. The results show that the formation of Mg3In and Mg (In) solid solution during dehydrogenation significantly reduces the enthalpy and activation energy of dehydrogenation reaction of Mg2H2, thereby reducing the dehydrogenation temperature of Mg2H2 and remarkably improving the kinetic performance.