Synthesis and characterization of two new amide chloride compounds:: potential H2 storage materials

Rosalind A. Davies; Paul A. Anderson

doi:10.1016/j.ijhydene.2014.12.044

Synthesis and characterization of two new amide chloride compounds: potential H2 storage materials

Rosalind A. Davies, Paul A. Anderson

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Abstract

Two new amide chloride phases, with approximate stoichiometries Li₇(NH₂)₆Cl and Li₆Mg_0.5(NH₂)₆Cl, have been identified by powder X-ray diffraction, and their hydrogen storage properties studied. Both phases released hydrogen on reaction with LiH at a lower temperature than observed for lithium amide, and ammonia release was suppressed. The chloride ions were maintained within the structure after hydrogen desorption and rehydrogenation, raising the possibility that the materials might be cycled. The desorption properties of Li₇(NH₂)₆Cl were found to be similar to the previously reported amide chloride Li₄(NH₂)₃Cl but with a much reduced gravimetric penalty owing to chloride incorporation. Rehydrogenation of the imide products of reaction of both Li₇(NH₂)₆Cl and Li₆Mg_0.5(NH₂)₆Cl with LiH occurred more readily at 90 bar and 300 °C than that of Li₄(NH₂)₃Cl.

Original language	English
Pages (from-to)	3001-3005
Journal	International Journal of Hydrogen Energy
Volume	40
Issue number	7
Early online date	27 Jan 2015
DOIs	https://doi.org/10.1016/j.ijhydene.2014.12.044
Publication status	Published - 23 Feb 2015

Keywords

Complex hydrides
Hydrogen storage
Lithium
Magnesium
Amide chlorides
Powder X-ray diffraction

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@article{997c92dd841d4137b4928471e03423e6,

title = "Synthesis and characterization of two new amide chloride compounds:: potential H2 storage materials",

abstract = "Two new amide chloride phases, with approximate stoichiometries Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl, have been identified by powder X-ray diffraction, and their hydrogen storage properties studied. Both phases released hydrogen on reaction with LiH at a lower temperature than observed for lithium amide, and ammonia release was suppressed. The chloride ions were maintained within the structure after hydrogen desorption and rehydrogenation, raising the possibility that the materials might be cycled. The desorption properties of Li7(NH2)6Cl were found to be similar to the previously reported amide chloride Li4(NH2)3Cl but with a much reduced gravimetric penalty owing to chloride incorporation. Rehydrogenation of the imide products of reaction of both Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl with LiH occurred more readily at 90 bar and 300 °C than that of Li4(NH2)3Cl.",

keywords = "Complex hydrides, Hydrogen storage, Lithium, Magnesium, Amide chlorides, Powder X-ray diffraction",

author = "Davies, {Rosalind A.} and Anderson, {Paul A.}",

year = "2015",

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doi = "10.1016/j.ijhydene.2014.12.044",

language = "English",

volume = "40",

pages = "3001--3005",

journal = "International Journal of Hydrogen Energy",

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publisher = "Elsevier",

number = "7",

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TY - JOUR

T1 - Synthesis and characterization of two new amide chloride compounds:

T2 - potential H2 storage materials

AU - Davies, Rosalind A.

AU - Anderson, Paul A.

PY - 2015/2/23

Y1 - 2015/2/23

N2 - Two new amide chloride phases, with approximate stoichiometries Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl, have been identified by powder X-ray diffraction, and their hydrogen storage properties studied. Both phases released hydrogen on reaction with LiH at a lower temperature than observed for lithium amide, and ammonia release was suppressed. The chloride ions were maintained within the structure after hydrogen desorption and rehydrogenation, raising the possibility that the materials might be cycled. The desorption properties of Li7(NH2)6Cl were found to be similar to the previously reported amide chloride Li4(NH2)3Cl but with a much reduced gravimetric penalty owing to chloride incorporation. Rehydrogenation of the imide products of reaction of both Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl with LiH occurred more readily at 90 bar and 300 °C than that of Li4(NH2)3Cl.

AB - Two new amide chloride phases, with approximate stoichiometries Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl, have been identified by powder X-ray diffraction, and their hydrogen storage properties studied. Both phases released hydrogen on reaction with LiH at a lower temperature than observed for lithium amide, and ammonia release was suppressed. The chloride ions were maintained within the structure after hydrogen desorption and rehydrogenation, raising the possibility that the materials might be cycled. The desorption properties of Li7(NH2)6Cl were found to be similar to the previously reported amide chloride Li4(NH2)3Cl but with a much reduced gravimetric penalty owing to chloride incorporation. Rehydrogenation of the imide products of reaction of both Li7(NH2)6Cl and Li6Mg0.5(NH2)6Cl with LiH occurred more readily at 90 bar and 300 °C than that of Li4(NH2)3Cl.

KW - Complex hydrides

KW - Hydrogen storage

KW - Lithium

KW - Magnesium

KW - Amide chlorides

KW - Powder X-ray diffraction

U2 - 10.1016/j.ijhydene.2014.12.044

DO - 10.1016/j.ijhydene.2014.12.044

M3 - Article

SN - 0360-3199

VL - 40

SP - 3001

EP - 3005

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 7

ER -

Synthesis and characterization of two new amide chloride compounds: potential H2 storage materials

Abstract

Keywords

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