In order to improve the hydrogen storage properties of magnesium hydride, poly-dihydrogen ruthenium complexes have been synthesized in powder form and added to commercial MgH₂ by mechanically ball milling (5 h under argon). To reveal the influence of the complexes on the hydrogen absorption/desorption kinetics of the Mg/MgH₂ system, microstructural characterization of the prepared mixtures was performed by XRD, SEM, TEM-EDX, NMR and XPS and the hydrogen storage properties measured by TPD, DSC and PCT. The complexes used as additives are precursors to the active species and exhibit two different impacts on MgH₂. First, during milling, the resulting coating at the surface of the MgH₂ particles prevents the aggregation of the powder. This leads, when compared with pure milled MgH₂, to an important reduction of the hydrogen desorption temperature (74 °C) and apparent activation energy of MgH₂ decomposition (30%) with the addition of only 5 wt% of the complexes. Second, during sorption cycling, the ruthenium dispersed at the surface of the MgH₂ particles greatly impacts the hydriding rates. The hydrogen absorption kinetics of the prepared mixtures, which are able to absorb 6.0 wt% of hydrogen at 200 °C in less than 5 min, are significantly improved in comparison with those of the pure milled sample.

中文翻译：

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聚二氢钌前体配合物的添加对Mg / MgH ₂系统储氢性能的影响†

为了改善氢化镁的储氢性能，已经以粉末形式合成了聚二氢钌配合物，并通过机械球磨（在氩气下5小时）将其添加到商用MgH _2中。为了揭示配合物对Mg / MgH ₂系统的氢吸收/解吸动力学的影响，通过XRD，SEM，TEM-EDX，NMR和XPS对制得的混合物进行了微观结构表征，并通过TPD测量了氢存储性能，DSC和PCT。用作添加剂的配合物是活性物质的前体，对MgH ₂表现出两种不同的影响。首先，在铣削过程中，在MgH ₂表面形成的涂层颗粒可防止粉末聚集。与纯研磨的MgH ₂相比，仅添加5 wt％的配合物，就可以显着降低氢气的解吸温度（74°C）和MgH ₂分解的表观活化能（30％）。第二，在吸附循环期间，分散在MgH ₂颗粒表面的钌极大地影响了氢化速率。与纯研磨样品相比，所制备的混合物的氢吸收动力学得到显着改善，该混合物能够在200°C下在不到5分钟的时间内吸收6.0 wt％的氢。