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Enhancement Effect of Bimetallic Amide K2Mn(NH2)4 and In-Situ Formed KH and Mn4N on the Dehydrogenation/Hydrogenation Properties of Li–Mg–N–H System

1
Nanotechnology Department, Helmholtz-Zentrum Geesthacht, Max-Planck Straße 1, 21502 Geesthacht, Germany
2
Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
3
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Atómico Bariloche, Av. Bustillo km 9500, S.C. de Bariloche, Argentina
4
Institut für Werkstofftechnik, Helmut-Schmidt-Universität, Holstenhofweg 85, 22043 Hamburg, Germany
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(14), 2779; https://doi.org/10.3390/en12142779
Received: 15 June 2019 / Revised: 9 July 2019 / Accepted: 15 July 2019 / Published: 19 July 2019
(This article belongs to the Special Issue Hydrides: Science and Technology)
In this work, we investigated the influence of the K2Mn(NH2)4 additive on the hydrogen sorption properties of the Mg(NH2)2 + 2LiH (Li–Mg–N–H) system. The addition of 5 mol% of K2Mn(NH2)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(NH2)2 + 2LiH containing K2Mn(NH2)4 indicates the presence of Mn4N. However, no crystalline K-containing phases were detected. Upon dehydrogenation, the formation of KH is observed. The presence of KH and Mn4N 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. View Full-Text
Keywords: Bimetallic amide; hydrogen storage; amide-hydride; in situ X-ray diffraction; activation energy; reaction rate Bimetallic amide; hydrogen storage; amide-hydride; in situ X-ray diffraction; activation energy; reaction rate
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Gizer, G.; Cao, H.; Puszkiel, J.; Pistidda, C.; Santoru, A.; Zhang, W.; He, T.; Chen, P.; Klassen, T.; Dornheim, M. Enhancement Effect of Bimetallic Amide K2Mn(NH2)4 and In-Situ Formed KH and Mn4N on the Dehydrogenation/Hydrogenation Properties of Li–Mg–N–H System. Energies 2019, 12, 2779.

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