A View on Formation Gap in Transition Metal Hydrides and Its Collapse

Late transition metals (LTMs) do not form hydrides under conventional experimental conditions except for palladium (Pd). The incorporation of a small amount of metal with low electronegativity converts LTMs into hydrogen (H) storage intermetallics (IMs) such as LaNi5. We examined the critical proper...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2021-08, Vol.143 (30), p.11345-11348
Main Authors: Mizoguchi, Hiroshi, Park, Sang-Won, Hosono, Hideo
Format: Article
Language:English
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Summary:Late transition metals (LTMs) do not form hydrides under conventional experimental conditions except for palladium (Pd). The incorporation of a small amount of metal with low electronegativity converts LTMs into hydrogen (H) storage intermetallics (IMs) such as LaNi5. We examined the critical property of the H absorbing ability of LTMs and found that the lattice softness of Pd is a unique parameter for H insertion. This idea is applicable to H storage IMs. Indeed, negatively charged LTM ions, such as Niδ− in LaNi5, play a crucial role in hydrogenation. These ions cause lattice softening, which renders H solution possible. As a result, we propose that lattice softness can be an effective criterion for the development of new H storage IMs.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.1c06307