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Open AccessArticle

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

WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Author to whom correspondence should be addressed.
Academic Editor: Hai-Wen Li
Energies 2015, 8(6), 5459-5466;
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)
PDF [576 KB, uploaded 8 June 2015]


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

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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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