Hydrogen Storage Properties of Nanoconfined LiBH4–Mg2NiH4 Reactive Hydride Composites

LiBH4–Mg2NiH4 reactive hydride composites have been nanoconfined into two types of mesoporous carbons: a templated carbon with ordered small pores of ∼4 nm and a carbon aerogel with pores size of ∼30 nm. In situ synchrotron X-ray diffraction has revealed the formation of the MgNi2.5B2 compound durin...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2015-03, Vol.119 (11), p.5819-5826
Main Authors: Javadian, Payam, Zlotea, Claudia, Ghimbeu, Camelia Matei, Latroche, Michel, Jensen, Torben R
Format: Article
Language:English
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Summary:LiBH4–Mg2NiH4 reactive hydride composites have been nanoconfined into two types of mesoporous carbons: a templated carbon with ordered small pores of ∼4 nm and a carbon aerogel with pores size of ∼30 nm. In situ synchrotron X-ray diffraction has revealed the formation of the MgNi2.5B2 compound during dehydrogenation at 300 °C and 5 bar of H2 pressure. The hydrogen desorption from nanoconfined LiBH4–Mg2NiH4 shows a single-step reaction at around 300 °C, as observed by mass spectroscopy coupled with thermogravimetric analysis. A synergistic effect is suggested, which facilitates lower hydrogen release than previously reported nanoconfined systems. Effective nanoconfinement provides faster kinetics of hydrogen release. Nevertheless, LiBH4–Mg2NiH4 shows progressive loss of capacity during cycling.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp5117307