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Metal (Li, Al, Ca and Ti) Absorbed Graphene with Defects for Hydrogen Storage: First-Principles Calculations

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The characteristics of Li, Al, Ca and Ti metal adsorption on graphene with boron substitution and various vacancy defects are investigated using density functional theory calculation. Hydrogen adsorption characteristics and electronic structure of H2/metal adsorbed graphene were also calculated. It was found that Li, Al, Ca and Ti metal atoms are well dispersed on the graphene and can form a (2 × 2) pattern because clustering of metal atoms is hindered by the repulsive Coulomb interaction between the metal adatoms and the strong bonding force between the dispersed metal atom and graphene. Ca and Ti metal adatom show strong binding energy with the graphene in the cases of B substitution and specific vacancy, respectively. Ca and Ti were also found to be able to 8H2 molecules on the double side of the boron substituted graphene. This allows for a storage capacity of a 8.5 and 7.9 wt% hydrogen for Ca and Ti adatom, respectively.
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Keywords: AB INITIO; GRAPHENE; HYDROGEN STORAGE; METAL ADSORPTION

Document Type: Research Article

Publication date: 2011-12-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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