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Issue 9, 2011
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Modification of the hydrogenstorage properties of Li3N by confinement into mesoporous carbons

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Abstract

This study presents an innovative synthetic route to Li3N@carbon composites for the purpose of use as hydrogen storage materials. The synthesis method is provided by wet impregnation of mesoporous carbons (graphitic or non-graphitic) using lithium azide solutions, followed by a thermal treatment allowing the transformation of lithium azide into lithium nitride, the latter being formed into the porosity of the carbon hosts. It has been shown by X-ray diffraction that the high-pressure β-phase of Li3N can be stabilized within the carbon matrix. The resulting Li3N@carbon composites have desirable hydrogen storage properties with fast hydrogen absorption/desorption kinetics at 200 °C (much faster than those measured for non-confined Li3N) as well as a completely reversible hydrogen storage process: a 20 wt% Li3N-loaded composite leads to a reversible hydrogen storage capacity of 1.8 wt% (e.g. about 9 wt% per mass of Li3N).

Graphical abstract: Modification of the hydrogen storage properties of Li3N by confinement into mesoporous carbons

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Supplementary files

Article information


Submitted
31 Mar 2011
Accepted
15 Jun 2011
First published
25 Jul 2011

Energy Environ. Sci., 2011,4, 3625-3631
Article type
Paper

Modification of the hydrogen storage properties of Li3N by confinement into mesoporous carbons

R. Demir-Cakan, W. S. Tang, A. Darwiche and R. Janot, Energy Environ. Sci., 2011, 4, 3625
DOI: 10.1039/C1EE01387D

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