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https://hdl.handle.net/1959.11/51401
Title: | Light metal decorated graphdiyne nanosheets for reversible hydrogen storage |
Contributor(s): | Panigrahi, P (author); Dhinakaran, A K (author); Naqvi, S R (author); Gollu, S R (author); Ahuja, R (author); Hussain, T (author) |
Publication Date: | 2018-08-31 |
Early Online Version: | 2018-06-20 |
DOI: | 10.1088/1361-6528/aac84c |
Handle Link: | https://hdl.handle.net/1959.11/51401 |
Abstract: | | The sensitive nature of molecular hydrogen (H2) interaction with the surfaces of pristine and functionalized nanostructures, especially two-dimensional materials, has been a subject of debate for a while now. An accurate approximation of the H2 adsorption mechanism has vital significance for fields such as H2 storage applications. Owing to the importance of this issue, we have performed a comprehensive density functional theory (DFT) study by means of several different approximations to investigate the structural, electronic, charge transfer and energy storage properties of pristine and functionalized graphdiyne (GDY) nanosheets. The dopants considered here include the light metals Li, Na, K, Ca, Sc and Ti, which have a uniform distribution over GDY even at high doping concentration due to their strong binding and charge transfer mechanism. Upon 11% of metal functionalization, GDY changes into a metallic state from being a small band-gap semiconductor. Such situations turn the dopants to a partial positive state, which is favorable for adsorption of H2 molecules. The adsorption mechanism of H2 on GDY has been studied and compared by different methods like generalized gradient approximation, van der Waals density functional and DFT-D3 functionals. It has been established that each functionalized system anchors multiple H2 molecules with adsorption energies that fall into a suitable range regardless of the functional used for approximations. A significantly high H2 storage capacity would guarantee that light metal-doped GDY nanosheets could serve as efficient and reversible H2 storage materials.
Publication Type: | Journal Article |
Source of Publication: | Nanotechnology, 29(35), p. 1-10 |
Publisher: | Institute of Physics Publishing Ltd |
Place of Publication: | United Kingdom |
ISSN: | 1361-6528 0957-4484 |
Fields of Research (FoR) 2020: | 340701 Computational chemistry 510403 Condensed matter modelling and density functional theory 340302 Macromolecular materials |
Socio-Economic Objective (SEO) 2020: | 170308 Hydrogen storage 170803 Hydro-electric energy 170899 Renewable energy not elsewhere classified |
Peer Reviewed: | Yes |
HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
Appears in Collections: | Journal Article School of Science and Technology
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