Dehydriding Process and Hydrogen–Deuterium Exchange of LiBH 4 –Mg 2 FeD 6 Composites

Guanqiao Li, Motoaki Matsuo, Katsutoshi Aoki, Tamio Ikeshoji and Shin-ichi Orimo
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Guanqiao Li: WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
Motoaki Matsuo: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Katsutoshi Aoki: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Tamio Ikeshoji: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Shin-ichi Orimo: WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan

Energies, 2015, vol. 8, issue 6, 1-8

Abstract: The dehydriding process and hydrogen–deuterium exchange (H–D exchange) of x LiBH 4 + (1 ? x )Mg 2 FeD 6 ( 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 LiBH 4 and Mg 2 FeD 6 , 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 [BH 4 ] ? and [FeD 6 ] 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 [BH 4 ] ? was replaced by D atoms. For x = 0.75, H–D exchange also occurred and about one to two H atoms in [BH 4 ] ? was replaced by D atoms immediately before the dehydriding. In contrast to the situation for x = 0.25, firstly LiBH 4 and Mg 2 FeD 6 dehydrided simultaneously with a special molar ratio = 1:1 at x = 0.75, and then the remaining LiBH 4 reacted with the Mg and Fe derived from the dehydriding of Mg 2 FeD 6 .

Keywords: complex hydride; borohydride; isotopic exchange; hydride composites; hydrogen storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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