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Materials 2015, 8(7), 3896-3909; doi:10.3390/ma8073896

Kinetic Modification on Hydrogen Desorption of Lithium Hydride and Magnesium Amide System

1
Institute for Sustainable Sciences and Development, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
2
Creative Research Institution, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
3
Central Research Laboratory, Taiheiyo Cement Corporation, 2-4-2 Osaku, Sakura 285-8655, Japan
4
Graduate School of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan
5
Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Umit Demirci
Received: 25 April 2015 / Revised: 3 June 2015 / Accepted: 9 June 2015 / Published: 29 June 2015
(This article belongs to the Special Issue Hydrogen Storage Materials)
View Full-Text   |   Download PDF [579 KB, uploaded 29 June 2015]   |  

Abstract

Various synthesis and rehydrogenation processes of lithium hydride (LiH) and magnesium amide (Mg(NH2)2) system with 8:3 molar ratio are investigated to understand the kinetic factors and effectively utilize the essential hydrogen desorption properties. For the hydrogen desorption with a solid-solid reaction, it is expected that the kinetic properties become worse by the sintering and phase separation. In fact, it is experimentally found that the low crystalline size and the close contact of LiH and Mg(NH2)2 lead to the fast hydrogen desorption. To preserve the potential hydrogen desorption properties, thermochemical and mechanochemical rehydrogenation processes are investigated. Although the only thermochemical process results in slowing the reaction rate due to the crystallization, the ball-milling can recover the original hydrogen desorption properties. Furthermore, the mechanochemical process at 150 °C is useful as the rehydrogenation technique to preserve the suitable crystalline size and mixing state of the reactants. As a result, it is demonstrated that the 8LiH and 3Mg(NH2)2 system is recognized as the potential hydrogen storage material to desorb more than 5.5 mass% of H2 at 150 °C. View Full-Text
Keywords: hydrogen storage; kinetics; crystallinity; ball-milling; mechanochemical process; lithium; magnesium hydrogen storage; kinetics; crystallinity; ball-milling; mechanochemical process; lithium; magnesium
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Miyaoka, H.; Wang, Y.; Hino, S.; Isobe, S.; Tokoyoda, K.; Ichikawa, T.; Kojima, Y. Kinetic Modification on Hydrogen Desorption of Lithium Hydride and Magnesium Amide System. Materials 2015, 8, 3896-3909.

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