Synthesis and Hydrogen Storage Properties of a Single-Phase Magnesium Borohydride Mg(BH4)2

Hai-Wen Li; Kentaro Kikuchi; Toyoto Sato; Yuko Nakamori; Nobuko Ohba; Masakazu Aoki; Kazutoshi Miwa; Shin-ichi Towata; Shin-ichi Orimo

doi:10.2320/matertrans.MA200807

Synthesis and Hydrogen Storage Properties of a Single-Phase Magnesium Borohydride Mg(BH₄)₂

Hai-Wen Li, Kentaro Kikuchi, Toyoto Sato, Yuko Nakamori, Nobuko Ohba, Masakazu Aoki, Kazutoshi Miwa, Shin-ichi Towata, Shin-ichi Orimo

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Keywords: borohydride, synthesis, dehydriding, hydrogen storage, complex hydride

JOURNAL FREE ACCESS

2008 Volume 49 Issue 10 Pages 2224-2228

DOI https://doi.org/10.2320/matertrans.MA200807

View "Advance Publication" version (July 30, 2008).

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Abstract

A single phase Mg(BH₄)₂ was successfully synthesized and its hydrogen storage properties were systematically investigated. Depending on the synthesis conditions, Mg(BH₄)₂ forms low- and high-temperature phases with different crystal structures. The dehydriding reaction of Mg(BH₄)₂ starts at approximately 500 K, and 14.4 mass% of hydrogen is released through a multi-step reaction. Furthermore, 6.1 mass% of hydrogen can be rehydrided for the sample of Mg(BH₄)₂ after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB₁₂H₁₂.

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