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Light metal decorated graphdiyne nanosheets for reversible hydrogen storage
P Panigrahi1, A K Dhinakaran1, S R Naqvi2
1Clean Energy and Nano Convergence Centre, Hindustan Institute of Technology and Science, Chennai 603103, Tamil Nadu, India.
Nanotechnology
|May 30, 2018
Summary
Light metal-doped graphdiyne (GDY) nanosheets show promise for hydrogen storage. Functionalized GDY exhibits metallic properties favorable for adsorbing multiple H2 molecules with suitable energies.
Area of Science:
- Materials Science
- Surface Science
- Computational Chemistry
Background:
- The interaction of molecular hydrogen (H2) with nanostructures is crucial for H2 storage applications.
- Understanding H2 adsorption mechanisms on two-dimensional materials is an ongoing research challenge.
Purpose of the Study:
- To investigate the structural, electronic, charge transfer, and energy storage properties of pristine and metal-functionalized graphdiyne (GDY) nanosheets.
- To explore the H2 adsorption mechanism on functionalized GDY using various computational approximations.
Main Methods:
- Comprehensive density functional theory (DFT) calculations were employed.
- Investigated functionalization with light metals (Li, Na, K, Ca, Sc, Ti).
- Compared adsorption mechanisms using generalized gradient approximation, van der Waals density functional, and DFT-D3 functionals.
Main Results:
- Uniform distribution of light metals on GDY, even at high concentrations, due to strong binding.
- Metal functionalization (11%) transforms GDY from a semiconductor to a metallic state.
- Functionalized GDY systems effectively anchor multiple H2 molecules with favorable adsorption energies.
Conclusions:
- Light metal-doped GDY nanosheets demonstrate potential as efficient and reversible H2 storage materials.
- The metallic nature induced by doping enhances H2 adsorption capacity.
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