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Surface modification of MgH2 by ZrCl4 to tailor the reversible hydrogen storage performance

Kumar, Sanjay et al.

International journal of hydrogen energy. Volume 42:Number 9 (2017); pp 6152-6159 -- Elsevier

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  • Title:
    Surface modification of MgH2 by ZrCl4 to tailor the reversible hydrogen storage performance
  • Author: Kumar, Sanjay;
    Jain, Ankur;
    Yamaguchi, S.;
    Miyaoka, H.;
    Ichikawa, T.;
    Mukherjee, A.;
    Dey, G.K.;
    Kojima, Y.
  • Found In: International journal of hydrogen energy. Volume 42:Number 9 (2017); pp 6152-6159
  • Journal Title: International journal of hydrogen energy
  • Subjects: Hydrogène (Combustible)--Périodiques; Hydrogen as fuel--Periodicals; Hydrogen as fuel; Periodicals; Catalysis--Kinetics--Thermodynamics--ZrCl4--Sorption--Activation energy; Dewey: 665.81
  • Rights: legaldeposit
  • Publication Details: Elsevier
  • Abstract: Abstract:

    Zirconium tetrachloride (ZrCl4) is one of the best catalysts for improving the reversible hydrogen storage performance of the MgH2–Mg system. MgH2catalyzed by ZrCl4shows a remarkably reduced apparent activation energy, which leads to improved dehydrogenation and rehydrogenation kinetics. X-ray photoelectron spectroscopy (XPS) revealed the chemical state of ZrCl4as ZrCl3and metallic Zr after ball milling with MgH2. The in situ -formed ZrCl3and metallic Zr showed good catalytic effect on MgH2, which substantially lowered the dehydrogenation and rehydrogenation temperatures. The scanning electron microstructure analysis revealed the excellent grain refinement property of the catalyst to reduce the crystallite size of MgH2during ball-milling. The decreased crystallite size reduces the diffusion path length of hydrogen and increases the active surface area of MgH2–Mg, which eventually enhances the dehydrogenation and rehydrogenation kinetics.

    Graphical abstract:

    Highlights:

    Cyclic performance of ZrCl4-doped MgH2was studied.

    ZrCl4-doped Mg could be rehydrogenated at room temperature.

    Activation energy of hydrogen absorption-desorption of c-Mg was significantly reduced.

    ZrCl4was reduced to ZrCl3and Zr by MgH2, which acts as a catalyst.


  • Identifier: System Number: LDEAvdc_100045874286.0x000001; Journal ISSN: 0360-3199; 10.1016/j.ijhydene.2017.01.193
  • Publication Date: 2017
  • Physical Description: Electronic
  • Shelfmark(s): ELD Digital store

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