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Enhancement Effect of Bimetallic Amide K 2 Mn(NH 2 ) 4 and In-Situ Formed KH and Mn 4 N on the Dehydrogenation/Hydrogenation Properties of Li–Mg–N–H System

Author

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  • Gökhan Gizer

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany)

  • Hujun Cao

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany
    Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)

  • Julián Puszkiel

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany
    Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Atómico Bariloche, Av. Bustillo km 9500, S.C. de Bariloche, Argentina)

  • Claudio Pistidda

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany)

  • Antonio Santoru

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany)

  • Weijin Zhang

    (Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)

  • Teng He

    (Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)

  • Ping Chen

    (Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)

  • Thomas Klassen

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany
    Institut für Werkstofftechnik, Helmut-Schmidt-Universität, Holstenhofweg 85, 22043 Hamburg, Germany)

  • Martin Dornheim

    (Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany)

Abstract

In this work, we investigated the influence of the K 2 Mn(NH 2 ) 4 additive on the hydrogen sorption properties of the Mg(NH 2 ) 2 + 2LiH (Li–Mg–N–H) system. The addition of 5 mol% of K 2 Mn(NH 2 ) 4 to the Li–Mg–N–H system leads to a decrease of the dehydrogenation peak temperature from 200 °C to 172 °C compared to the pristine sample. This sample exhibits a constant hydrogen storage capacity of 4.2 wt.% over 25 dehydrogenation/rehydrogenation cycles. Besides that, the in-situ synchrotron powder X-ray diffraction analysis performed on the as prepared Mg(NH 2 ) 2 + 2LiH containing K 2 Mn(NH 2 ) 4 indicates the presence of Mn 4 N. However, no crystalline K-containing phases were detected. Upon dehydrogenation, the formation of KH is observed. The presence of KH and Mn 4 N positively influences the hydrogen sorption properties of this system, especially at the later stage of rehydrogenation. Under the applied conditions, hydrogenation of the last 1 wt.% takes place in only 2 min. This feature is preserved in the following three cycles.

Suggested Citation

  • Gökhan Gizer & Hujun Cao & Julián Puszkiel & Claudio Pistidda & Antonio Santoru & Weijin Zhang & Teng He & Ping Chen & Thomas Klassen & Martin Dornheim, 2019. "Enhancement Effect of Bimetallic Amide K 2 Mn(NH 2 ) 4 and In-Situ Formed KH and Mn 4 N on the Dehydrogenation/Hydrogenation Properties of Li–Mg–N–H System," Energies, MDPI, vol. 12(14), pages 1-12, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2779-:d:249930
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    References listed on IDEAS

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    3. Ping Chen & Zhitao Xiong & Jizhong Luo & Jianyi Lin & Kuang Lee Tan, 2002. "Interaction of hydrogen with metal nitrides and imides," Nature, Nature, vol. 420(6913), pages 302-304, November.
    4. Han Wang & Hujun Cao & Guotao Wu & Teng He & Ping Chen, 2015. "The improved Hydrogen Storage Performances of the Multi-Component Composite: 2Mg(NH 2 ) 2 –3LiH–LiBH 4," Energies, MDPI, vol. 8(7), pages 1-12, July.
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