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Purity of MgH2 Improved by the Process of Pre-milling Assisted Hydriding of Mg Powder under a Hydrogen Pressure of 0.5 MPa

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Abstract

Magnesium hydride (MgH2) is a very promising hydrogen storage material due to its high hydrogen storage capacity (7.6 wt %) and low cost. It has been paid increasing attention as it may be employed in supplying hydrogen on-board. However, the production of MgH2 in high purity is still a challenging issue because the process requires high pressure and prolonged time. In this paper, high purity of MgH2 was achieved by the process of pre-milling assisted hydriding of Mg powder under a hydrogen pressure as low as 0.5 MPa. The effects of hydrogen pressure as well as hydriding and mechanical milling parameters, such as ball-to-powder ratio and milling time were investigated systematically. The relationship between the morphologies and the purities of products were discussed in detail. Our results revealed that MgH2 purity of 94.19 wt % can be achieved by hydriding with heating up to 853 K followed by cooling down to 593 K and keeping this temperature for 5 h after the milling pretreatment of Mg powder, at 400 rpm milling speed, 20 : 1 ball-to-powder ratio and 40 min milling time. SEM observation of the morphology of products indicated the achievement of the purity of MgH2 under a hydrogen pressure as low as 0.5 MPa was related to the structural defects and activation of Mg powders caused by the mechanical milling.

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ACKNOWLEDGMENTS

This work was supported by the National Natural Science Foundation of China (NSFC, grant nos. 51571112, 51471087, 51601090), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (grant no. 13KJA430003), the Natural Science Foundation of Jiangsu Province (BK20151405, BK20161004), and the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, 211816, Nanjing, China

    Deyu Gan, Jiguang Zhang, Yana Liu, Yunfeng Zhu & Liquan Li

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, 211816, Nanjing, China

    Deyu Gan, Jiguang Zhang, Yana Liu, Yao Zhang, Yunfeng Zhu & Liquan Li

  3. School of Materials Science and Engineering, Southeast University, 211189, Nanjing, China

    Yao Zhang

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  1. Deyu Gan
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  2. Jiguang Zhang
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  3. Yana Liu
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  4. Yao Zhang
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  5. Yunfeng Zhu
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  6. Liquan Li
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Correspondence to Yunfeng Zhu or Liquan Li.

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Deyu Gan, Zhang, J., Liu, Y. et al. Purity of MgH2 Improved by the Process of Pre-milling Assisted Hydriding of Mg Powder under a Hydrogen Pressure of 0.5 MPa. Russ. J. Phys. Chem. 93, 665–673 (2019). https://doi.org/10.1134/S0036024419040101

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  • DOI: https://doi.org/10.1134/S0036024419040101

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