采用 Mg-In 固溶体合金对氢化镁进行热力学和动力学失稳处理。

Thermodynamic and kinetic destabilization of magnesium hydride using Mg-In solid solution alloys.

机构信息

Department of Metallurgical Engineering, The University of Utah, 135 South 1460 East, Room 412, Salt Lake City, Utah 84112-0114, USA.

出版信息

J Am Chem Soc. 2013 Jul 31;135(30):10982-5. doi: 10.1021/ja4058794. Epub 2013 Jul 19.

DOI:10.1021/ja4058794

PMID:23855837

Abstract

Efforts to thermodynamically destabilize magnesium hydride (MgH2), so that it can be used for practical hydrogen storage applications, have been a difficult challenge that has eluded scientists for decades. This letter reports that MgH2 can indeed be destabilized by forming solid solution alloys of magnesium with group III and IVB elements, such as indium. Results of this research showed that the equilibrium hydrogen pressure of a Mg-0.1In alloy is 70% higher than that of pure MgH2. The temperature at 1 bar hydrogen pressure (T1bar) of Mg-0.1In alloy was reduced to 262.9 °C from 278.9 °C, which is the T1bar of pure MgH2. Furthermore, the kinetic rates of dehydrogenation of Mg-0.1In alloy hydride doped with a titanium intermetallic (TiMn2) catalyst were also significantly improved compared with those of MgH2.

摘要

努力从热力学上使氢化镁（MgH2）不稳定，使其能够用于实际的储氢应用，这是一个几十年来一直困扰科学家的难题。这封信报告说，通过形成镁与 III 族和 IVB 族元素（如铟）的固溶体合金，确实可以使 MgH2 不稳定。这项研究的结果表明，Mg-0.1In 合金的平衡氢压比纯 MgH2 高 70%。Mg-0.1In 合金在 1 巴氢压下的温度（T1bar）从 278.9°C 降低到 262.9°C，这是纯 MgH2 的 T1bar。此外，掺杂钛金属间化合物（TiMn2）催化剂的 Mg-0.1In 合金氢化物的脱氢动力学速率也比 MgH2 显著提高。