Diffusion, adsorption, and desorption of molecular hydrogen on graphene and in graphite

Justin Petucci, Carl Leblond, Majid Karimi, Gianfranco Vidali

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The diffusion of molecular hydrogen (H2) on a layer of graphene and in the interlayer space between the layers of graphite is studied using molecular dynamics computer simulations. The interatomic interactions were modeled by an Adaptive Intermolecular Reactive Empirical Bond Order (AIREBO) potential. Molecular statics calculations of H2 on graphene indicate binding energies ranging from 41 meV to 54 meV and migration barriers ranging from 3 meV to 12 meV. The potential energy surface of an H2 molecule on graphene, with the full relaxations of molecular hydrogen and carbon atoms is calculated. Barriers for the formation of H2 through the Langmuir-Hinshelwood mechanism are calculated. Molecular dynamics calculations of mean square displacements and average surface lifetimes of H2 on graphene at various temperatures indicate a diffusion barrier of 9.8 meV and a desorption barrier of 28.7 meV. Similar calculations for the diffusion of H 2 in the interlayer space between the graphite sheets indicate high and low temperature regimes for the diffusion with barriers of 51.2 meV and 11.5 meV. Our results are compared with those of first principles.

Original languageEnglish (US)
Article number044706
JournalThe Journal of Chemical Physics
Volume139
Issue number4
DOIs
StatePublished - Jul 28 2013

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Hydrogen
Desorption
graphene
graphite
desorption
Adsorption
adsorption
hydrogen
interlayers
Molecular dynamics
molecular dynamics
Potential energy surfaces
Diffusion barriers
hydrogen atoms
Binding energy
computerized simulation
binding energy
potential energy
Carbon

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Diffusion, adsorption, and desorption of molecular hydrogen on graphene and in graphite. / Petucci, Justin; Leblond, Carl; Karimi, Majid; Vidali, Gianfranco.

In: The Journal of Chemical Physics, Vol. 139, No. 4, 044706, 28.07.2013.

Research output: Contribution to journalArticle

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