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

Gökhan Gizer, Hujun Cao, Julián Puszkiel, Claudio Pistidda, Antonio Santoru, Weijin Zhang, Teng He, Ping Chen, Thomas Klassen and Martin Dornheim
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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
Julián Puszkiel: Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany
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
Martin Dornheim: Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany

Energies, 2019, vol. 12, issue 14, 1-12

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.

Keywords: Bimetallic amide; hydrogen storage; amide-hydride; in situ X-ray diffraction; activation energy; reaction rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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