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Synthesis, structural characterization, and hydrogen desorption properties of Na[Al(NH2BH3)4]

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Title: Synthesis, structural characterization, and hydrogen desorption properties of Na[Al(NH2BH3)4]
Authors: Nakagawa, Yuki Browse this author
Shinzato, Keita Browse this author
Nakagawa, Tessui Browse this author
Nakajima, Keita Browse this author
Isobe, Shigehito Browse this author →KAKEN DB
Goshome, Kiyotaka Browse this author
Miyaoka, Hiroki Browse this author
Ichikawa, Takayuki Browse this author →KAKEN DB
Keywords: Amidoborane
Ammonia borane
Sodium alanate
Gas eruption
Issue Date: 2-Mar-2017
Publisher: Elsevier
Journal Title: International journal of hydrogen energy
Volume: 42
Issue: 9
Start Page: 6173
End Page: 6180
Publisher DOI: 10.1016/j.ijhydene.2016.12.062
Abstract: Na[Al(NH2BH3)4], a mixed-metal amidoborane, was synthesized by ball-milling (solid method) and the chemical reaction in THF (solution method). Solid method has a tendency to remain unreacted NaAlH4 and AB. In the solution method, the partial decomposition of Na[Al(NH2BH3)4] would proceed during mixing in THF. The local structural characterization of as-synthesized material was performed by MAS NMR and FT-IR. While Na[Al(NH2BH3)4] desorbed hydrogen in two steps as reported, the results of structural characterization suggested that the hydrogen desorption in the 2nd step would originate from the AlNBH phase. Effect of hydrogen pressure during ball-milling was also investigated for nNH3BH3NaAlH4 (n = 1, 4) composites. In the case of n = 4, Na[Al(NH2BH3)4] was formed under both Ar and H2 atmosphere. However, in the case of n = 1, Na[Al(NH2BH3)4] was only formed under H2 atmosphere, whereas most of H2 was desorbed during ball-milling under Ar atmosphere. Thus, the hydrogen pressure is necessary for the synthesis in the case of n = 1. Potential energy diagram of AB-NaAlH4 system was described.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中川 祐貴

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