Effect of vacancy defects in graphene on metal anchoring and hydrogen adsorption
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- Effect of vacancy defects in graphene on metal anchoring and hydrogen adsorption
- Kim, Gyubong; Jhi, Seung-Hoon; Lim, Seokho; Park, Noejung
- Alkaline-earth metals; Binding properties; First-principles calculations; Graphene; Graphenes; Hydrogen adsorptions; Hydrogen molecules; Hydrogen uptake capacities; Metal atoms; Vacancy complexes; Vacancy defects
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.94, no.17, pp. -
- The dispersion of transition and alkaline-earth metals on defective graphenes is studied using first-principles calculations. The effect of vacancy defects on binding properties of metal atoms to the graphene and with hydrogen molecules is particularly investigated. It is shown that vacancy defects enhance efficiently the metal binding energy and thus its dispersion, particularly for alkaline-earth metals. Mg on vacancy defects shows a substantial increase in its binding energy and hydrogen uptake capacity. Among metals considered, Ca-vacancy complexes are found to exhibit the most favorable hydrogen adsorption characteristics in terms of the binding energy and the capacity.
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