Issue 39, 2011

Destabilisation of the Li–N–H hydrogen storage system with elemental Si

Abstract

A significant improvement in the dehydrogenation kinetics of the (LiNH2 + LiH) system was obtained upon doping with elemental Si. Whilst, complete dehydrogenation of the (LiNH2 + LiH) system requires more than 2 h, the time required for full dehydrogenation was reduced to less than 30 min by doping with elemental Si. It is observed that Si thermodynamically destabilises the system through the formation of novel intermediate phases resulting from the reaction of Si with both LiNH2 and LiH. Such intermediate phases are also believed to enhance reaction kinetics by providing a path for accelerated dehydrogenation and the rapid release of hydrogen at the early stages of the reaction. It is believed that the dehydrogenation kinetics of the (LiNH2 + LiH) system, which is controlled by the diffusion of H from LiH and H+ from LiNH2, becomes independent of diffusion upon Si addition due to an enhanced concentration gradient in reactive ionic species.

Graphical abstract: Destabilisation of the Li–N–H hydrogen storage system with elemental Si

Article information

Article type
Paper
Submitted
26 Jul 2011
Accepted
16 Aug 2011
First published
07 Sep 2011

Phys. Chem. Chem. Phys., 2011,13, 17683-17688

Destabilisation of the Li–N–H hydrogen storage system with elemental Si

S. Nayebossadri and K. Aguey-Zinsou, Phys. Chem. Chem. Phys., 2011, 13, 17683 DOI: 10.1039/C1CP22408E

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