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Energies 2015, 8(6), 5459-5466; doi:10.3390/en8065459

Dehydriding Process and Hydrogen–Deuterium Exchange of LiBH4–Mg2FeD6 Composites

1
WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
2
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Hai-Wen Li
Received: 30 April 2015 / Revised: 28 May 2015 / Accepted: 2 June 2015 / Published: 8 June 2015
(This article belongs to the Special Issue Hydrides: Fundamentals and Applications)
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Abstract

The dehydriding process and hydrogen–deuterium exchange (H–D exchange) of xLiBH4 + (1 − x)Mg2FeD6 (x = 0.25, 0.75) composites has been studied in detail. For the composition with x = 0.25, only one overlapping mass peak of all hydrogen and deuterium related species was observed in mass spectrometry. This implied the simultaneous dehydriding of LiBH4 and Mg2FeD6, despite an almost 190 °C difference in the dehydriding temperatures of the respective discrete complex hydrides. In situ infrared spectroscopy measurements indicated that H–D exchange between [BH4] and [FeD6]4− had occurred during ball-milling and was promoted upon heating. The extent of H–D exchange was estimated from the areas of the relevant mass signals: immediately prior to the dehydriding, more than two H atoms in [BH4] was replaced by D atoms. For x = 0.75, H–D exchange also occurred and about one to two H atoms in [BH4] was replaced by D atoms immediately before the dehydriding. In contrast to the situation for x = 0.25, firstly LiBH4 and Mg2FeD6 dehydrided simultaneously with a special molar ratio = 1:1 at x = 0.75, and then the remaining LiBH4 reacted with the Mg and Fe derived from the dehydriding of Mg2FeD6. View Full-Text
Keywords: complex hydride; borohydride; isotopic exchange; hydride composites; hydrogen storage complex hydride; borohydride; isotopic exchange; hydride composites; hydrogen storage
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

Li, G.; Matsuo, M.; Aoki, K.; Ikeshoji, T.; Orimo, S.-I. Dehydriding Process and Hydrogen–Deuterium Exchange of LiBH4–Mg2FeD6 Composites. Energies 2015, 8, 5459-5466.

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