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Microstructure and Hydrogen Storage Performance of Ball-Milled MgH 2 Catalyzed by FeTi

Author

Listed:
  • Ádám Révész

    (Department of Materials Physics, Eötvös Loránd University, H-1518 Budapest, Hungary)

  • Roman Paramonov

    (Department of Materials Physics, Eötvös Loránd University, H-1518 Budapest, Hungary)

  • Tony Spassov

    (Department of Chemistry, University of Sofia “St. Kl. Ohridski”, 1164 Sofia, Bulgaria)

  • Marcell Gajdics

    (Department of Materials Physics, Eötvös Loránd University, H-1518 Budapest, Hungary
    Center of Energy Research, Hungarian Academy of Sciences, H-1121 Budapest, Hungary)

Abstract

A high-energy ball-milling method was applied for different milling times (1 h, 3 h, and 10 h) to synthetize nanocrystalline MgH 2 powder samples catalyzed by Fe 2 Ti. Morphology and microstructure of the powders were characterized by scanning electron microscopy and X-ray diffraction. The recorded diffraction profiles were evaluated by the convolutional multiple whole profile fitting algorithm, in order to determine microstructural parameters of the composites, such as average crystallite size and average dislocation density. Differential scanning calorimetry was performed to investigate the dehydrogenation characteristics of the alloys. It was obtained that there exists an optimal milling time (3 h) when desorption occurs at the lowest temperature. X-ray diffraction of partially dehydrided states confirmed a two-step H-release, including the subsequent desorption of γ-MgH 2 and α-MgH 2 . The effect of milling time on the H-sorption performance was investigated in a Sievert-type apparatus. The best overall hydrogenation performance was obtained for the composite milled for 3 h.

Suggested Citation

  • Ádám Révész & Roman Paramonov & Tony Spassov & Marcell Gajdics, 2023. "Microstructure and Hydrogen Storage Performance of Ball-Milled MgH 2 Catalyzed by FeTi," Energies, MDPI, vol. 16(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1061-:d:1039613
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    References listed on IDEAS

    as
    1. Louis Schlapbach & Andreas Züttel, 2001. "Hydrogen-storage materials for mobile applications," Nature, Nature, vol. 414(6861), pages 353-358, November.
    2. Ádám Révész & Marcell Gajdics, 2021. "Improved H-Storage Performance of Novel Mg-Based Nanocomposites Prepared by High-Energy Ball Milling: A Review," Energies, MDPI, vol. 14(19), pages 1-31, October.
    3. Marcell Gajdics & Tony Spassov & Viktória Kovács Kis & Ferenc Béke & Zoltán Novák & Erhard Schafler & Ádám Révész, 2020. "Microstructural Investigation of Nanocrystalline Hydrogen-Storing Mg-Titanate Nanotube Composites Processed by High-Pressure Torsion," Energies, MDPI, vol. 13(3), pages 1-14, January.
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