De-hydrogenation/Rehydrogenation Properties and Reaction Mechanism of A m Zn(NH 2 ) n -2 n LiH Systems (A = Li, K, Na, and Rb)

Hujun Cao, Claudio Pistidda, Theresia M. M. Richter, Giovanni Capurso, Chiara Milanese, Jo-Chi Tseng, Yuanyuan Shang, Rainer Niewa, Ping Chen, Thomas Klassen and Martin Dornheim
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Hujun Cao: Institute of Hydrogen Technology, Materials Technology, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Claudio Pistidda: Institute of Hydrogen Technology, Materials Technology, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Theresia M. M. Richter: Institute of Inorganic Chemistry, University Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
Giovanni Capurso: Institute of Hydrogen Technology, Materials Technology, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Chiara Milanese: Pavia H2 Lab, C.S.G.I. & Department of Chemistry, Physical Chemistry Section, University of Pavia, Viale Taramelli 16, I-27100 Pavia, Italy
Jo-Chi Tseng: Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
Yuanyuan Shang: Institute of Hydrogen Technology, Materials Technology, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Rainer Niewa: Institute of Inorganic Chemistry, University Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
Ping Chen: Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Thomas Klassen: Institute of Hydrogen Technology, Materials Technology, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany
Martin Dornheim: Institute of Hydrogen Technology, Materials Technology, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany

Sustainability, 2022, vol. 14, issue 3, 1-13

Abstract: With the aim to find suitable hydrogen storage materials for stationary and mobile applications, multi-cation amide-based systems have attracted considerable attention, due to their unique hydrogenation kinetics. In this work, A m Zn(NH 2 ) n (with A = Li, K, Na, and Rb) were synthesized via an ammonothermal method. The synthesized phases were mixed via ball milling with LiH to form the systems A m Zn(NH 2 ) n -2 n LiH (with m = 2, 4 and n = 4, 6), as well as Na 2 Zn(NH 2 ) 4 ∙0.5NH 3 -8LiH. The hydrogen storage properties of the obtained materials were investigated via a combination of calorimetric, spectroscopic, and diffraction methods. As a result of the performed analyses, Rb 2 Zn(NH 2 ) 4 -8LiH appears as the most appealing system. This composite, after de-hydrogenation, can be fully rehydrogenated within 30 s at a temperature between 190 °C and 200 °C under a pressure of 50 bar of hydrogen.

Keywords: energy; hydrogen storage; amides; in-situ X-ray diffraction; reaction mechanism (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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