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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Improvement of the hydrogen storage characteristics of MgH2 with a flake Ni nano-catalyst composite
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Improvement of the hydrogen storage characteristics of MgH2 with a flake Ni nano-catalyst composite

机译：用薄片Ni纳米催化剂复合材料改进MGH2的储氢特性

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Magnesium hydride (MgH2) is considered to be one of the most promising hydrogen storage materials owing to its safety profile, low cost and high hydrogen storage capacity. However, its slow kinetic performance and thermal stability limit the possibility of practical applications. Herein, it is confirmed that the hydrogen storage performance of MgH2 can be effectively improved via doping with a flake Ni nano-catalyst. According to experimental results, a MgH2 + 5 wt% Ni composite begins to dehydrogenate at almost 180 degrees C and could dehydrogenate 6.7 wt% within 3 min at 300 degrees C. After complete dehydrogenation, hydrogen can be absorbed below 50 degrees C, and 4.6 wt% H-2 can be absorbed at 125 degrees C within 20 min at a hydrogen pressure of 3 MPa. In addition, the activation energies of MgH2 hydrogen absorption and dehydrogenation decreased by 28.03 and 71 kJ mol(-1), respectively. Cycling stability testing showed that the hydrogen storage capacity decreases significantly in the first few cycles and decreases slightly after 10 cycles. Furthermore, it was found that Mg2Ni/Mg2NiH4 was formed initially during the hydrogen absorption or desorption reaction on the surface of Mg/MgH2, which acted as a "hydrogen pump", accelerating the rates of hydrogen absorption and desorption.
机译：氢化镁（MgH2）因其安全性、低成本和高储氢能力而被认为是最有前途的储氢材料之一。然而，其缓慢的动力学性能和热稳定性限制了其实际应用的可能性。由此证实，通过掺杂片状镍纳米催化剂，可以有效改善MgH2的储氢性能。根据实验结果，MgH2+5 wt%Ni复合材料在接近180℃时开始脱氢，在300℃时可在3 min内脱氢6.7 wt%。完全脱氢后，氢可在50℃以下被吸收，而在125℃时，在3 MPa的氢压下可在20 min内吸收4.6 wt%H-2。此外，MgH2吸氢和脱氢的活化能分别降低了28.03和71 kJ mol（-1）。循环稳定性测试表明，储氢容量在前几个循环中显著降低，10个循环后略有降低。此外，还发现Mg2Ni/Mg2NiH4最初是在Mg/MgH2表面的吸氢或解吸反应中形成的，它起到了“氢泵”的作用，加快了吸氢和解吸的速度。

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