High pressure synthesis of novel metal hydrides

Daisuke Kyoi; Atsunori Kamegawa; Hitoshi Takamura; Masuo Okada; Naoyuki Kitamura; Tetsuo Sakai

doi:10.4131/jshpreview.17.264

High pressure synthesis of novel metal hydrides

Daisuke Kyoi, Atsunori Kamegawa, Hitoshi Takamura, Masuo Okada, Naoyuki Kitamura, Tetsuo Sakai

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

Abstract

Among metal hydrides, magnesium hydride (MgH₂) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity 7.6 mass%. However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH₂ can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg₇TiH ₁₆ 6.9 mass% would release hydrogen at a lower temperature by 130 K than MgH₂. The Mg-H ionic bonding distance in Mg₇TiH ₁₆ is longer than that in MgH₂. The observed lower dehydrogenation temperature seems to be consistent with the structure.

Original language	English
Pages (from-to)	264-270
Number of pages	7
Journal	Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume	17
Issue number	3
DOIs	https://doi.org/10.4131/jshpreview.17.264
Publication status	Published - 2007

Keywords

High pressure synthesis
Hydrogen storage materials
Magnesium-based hydrides

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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abstract = "Among metal hydrides, magnesium hydride (MgH2) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity 7.6 mass%. However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH2 can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg7TiH 16 6.9 mass% would release hydrogen at a lower temperature by 130 K than MgH2. The Mg-H ionic bonding distance in Mg7TiH 16 is longer than that in MgH2. The observed lower dehydrogenation temperature seems to be consistent with the structure.",

keywords = "High pressure synthesis, Hydrogen storage materials, Magnesium-based hydrides",

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TY - JOUR

T1 - High pressure synthesis of novel metal hydrides

AU - Kyoi, Daisuke

AU - Kamegawa, Atsunori

AU - Takamura, Hitoshi

AU - Okada, Masuo

AU - Kitamura, Naoyuki

AU - Sakai, Tetsuo

PY - 2007

Y1 - 2007

N2 - Among metal hydrides, magnesium hydride (MgH2) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity 7.6 mass%. However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH2 can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg7TiH 16 6.9 mass% would release hydrogen at a lower temperature by 130 K than MgH2. The Mg-H ionic bonding distance in Mg7TiH 16 is longer than that in MgH2. The observed lower dehydrogenation temperature seems to be consistent with the structure.

AB - Among metal hydrides, magnesium hydride (MgH2) would be a promising candidate for hydrogen storage materials because of its high hydrogen-storage capacity 7.6 mass%. However, the dehydrogenation temperature is too high for wide practical applications. Novel magnesium-based hydrides with better dehydrogenation properties than MgH2 can be prepared under hydrogen pressure of gigapascal (GPa). For instance, Mg7TiH 16 6.9 mass% would release hydrogen at a lower temperature by 130 K than MgH2. The Mg-H ionic bonding distance in Mg7TiH 16 is longer than that in MgH2. The observed lower dehydrogenation temperature seems to be consistent with the structure.

KW - High pressure synthesis

KW - Hydrogen storage materials

KW - Magnesium-based hydrides

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