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Nano Research

, Volume 11, Issue 7, pp 3802–3813 | Cite as

Metallized siligraphene nanosheets (SiC7) as high capacity hydrogen storage materials

  • Syeda R. Naqvi
  • Tanveer Hussain
  • Wei Luo
  • Rajeev Ahuja
Research Article

Abstract

A planar honeycomb monolayer of siligraphene (SiC7) could be a prospective medium for clean energy storage due to its light weight, and its remarkable mechanical and unique electronic properties. By employing van der Waals-induced first principles calculations based on density functional theory (DFT), we have explored the structural, electronic, and hydrogen (H2) storage characteristics of SiC7 sheets decorated with various light metals. The binding energies of lithium (Li), sodium (Na), potassium (K), magnesium (Mg), calcium (Ca),scandium (Sc), and titanium (Ti) dopants on a SiC7 monolayer were studied at various doping concentrations, and found to be strong enough to counteract the metal clustering effect. We further verified the stabilities of the metallized SiC7 sheets at room temperature using ab initio molecular dynamics (MD) simulations. Bader charge analysis revealed that upon adsorption, due to the difference in electronegativity, all the metal adatoms donated a fraction of their electronic charges to the SiC7 sheet. Each partially charged metal center on the SiC7sheets could bind a maximum of 4 to 5 H2 molecules. A high H2 gravimetric density was achieved for several dopants at a doping concentration of 12.50%. The H2binding energies were found to fall within the ideal range of 0.2–0.6 eV. Based on these findings, we propose that metal-doped SiC7 sheets can operate as efficient H2 storage media under ambient conditions.

Keywords

clean energy functionalization binding characteristics dopants 

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Notes

Acknowledgements

We are indebted to the Swedish Research Council (VR), StandUp, Swedish Energy Agency, and Swedish Institute for financial support. The SNIC and UPP-MAX are also acknowledged for providing computing time. T. Hussain is thankful to UQ for providing the financial support under UQ postdoctoral fellowship scheme and the resources at NCI National Facility systems at the Australian National University through National Computational Merit Allocation Scheme supported by the Australian Government and the University of Queensland Research Computing Centre.

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Syeda R. Naqvi
    • 1
  • Tanveer Hussain
    • 3
  • Wei Luo
    • 1
  • Rajeev Ahuja
    • 1
    • 2
  1. 1.Condensed Matter Theory Group, Department of Physics and Astronomy, Box 516Uppsala UniversityUppsalaSweden
  2. 2.Applied Materials Physics, Department of Materials and EngineeringRoyal Institute of Technology (KTH)StockholmSweden
  3. 3.Centre for Theoretical and Computational Molecular Science, Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneAustralia

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