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The reaction pathway and rate-limiting step of dehydrogenation of the LiHN2 + LiH mixture

Authors
Journal
Journal of Power Sources
0378-7753
Publisher
Elsevier
Publication Date
Volume
177
Issue
2
Identifiers
DOI: 10.1016/j.jpowsour.2007.11.029
Keywords
  • Hydrogen Storage Materials
  • Linh2
  • Lih
  • Reaction Kinetic
  • Reaction Mechanism

Abstract

Abstract The reaction pathway and rate-limiting step of dehydrogenation of the LiNH 2 + LiH mixture have been investigated. The study reveals that dehydrogenation of the LiNH 2 + LiH mixture is diffusion-controlled and the rate-limiting step is NH 3 diffusion through the Li 2NH product layer outside the LiNH 2 shrinking core. This phenomenon is explained based on a model describing the major steps of the dehydriding reaction of the mixture, and related to the evidence obtained from X-ray diffraction and specific surface area measurements of the mixture before and after isothermal hydrogen uptake/release cycles at high homologous temperatures.

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