DFT study of the hydrogen adsorption and storage on Ni4 cluster embedded in multivacancy graphene
| Autor: | M.E. Pronsato, Jorge Mario Marchetti, V. Orazi, R.E. Ambrusi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Graphene Energy Engineering and Power Technology 02 engineering and technology Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences London dispersion force 0104 chemical sciences law.invention Hydrogen storage symbols.namesake Fuel Technology Adsorption Chemical physics law symbols Molecule Density functional theory van der Waals force 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 45:30805-30817 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.08.106 |
| Popis: | Hydrogen adsorption stability, geometry, electronic structure and mechanism has been investigated on Ni4 cluster embedded in graphene with three, four and six vacancies by density functional theory (DFT) calculations. An energetic analysis of hydrogen adsorption by addition of one to four H2 molecules was performed for each system in order to determine their hydrogen storage capacity. Dispersion force contribution to the adsorption energy is quantitative evaluated to know whether H2 molecules adsorption behavior is dominated by chemical or van der Waals interactions. A further analysis of this type of interactions is also addressed by total and partial density of states. Bonding and charge transfer characteristics for the different steps involved in the adsorption mechanism are also included. Special attention is given to the effects caused by this new Ni/graphene interface to the hydrogen adsorption behavior. |
| Databáze: | OpenAIRE |
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