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De-hydrogenation/Rehydrogenation Properties and Reaction Mechanism of AmZn(NH$_2$)$_{n-2}$nLiH Systems (A = Li, K, Na, and Rb)
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(NH2)$_n$-2nLiH (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.
De-hydrogenation/Rehydrogenation Properties and Reaction Mechanism of AmZn(NH$_2$)$_{n-2}$nLiH Systems (A = Li, K, Na, and Rb)
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(NH2)$_n$-2nLiH (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.
De-hydrogenation/Rehydrogenation Properties and Reaction Mechanism of AmZn(NH$_2$)$_{n-2}$nLiH Systems (A = Li, K, Na, and Rb)
Cao, Hujun (author) / Pistidda, Claudio (author) / Dornheim, Martin (author) / Richter, Theresia M. M. (author) / Capurso, Giovanni (author) / Milanese, Chiara (author) / Tseng, Jo-Chi (author) / Shang, Yuanyuan (author) / Niewa, Rainer (author) / Chen, Ping (author)
2022-01-01
Sustainability 14(3), 1672 (2022). doi:10.3390/su14031672
Article (Journal)
Electronic Resource
English
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