期刊
VACUUM
卷 167, 期 -, 页码 280-286出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2019.06.021
关键词
Heteronanotube; SWCNT; DFT; Adsorption; Hydrogen storage; CBNNT
资金
- [03-FPK-19]
Using dispersion-corrected density functional theory (DFT-D3) calculations, we study hydrogen adsorption on single-walled carbon (SWCNTs) and carbon-boron-nitrogen nanotubes (CBNNTs). Hydrogen adsorption energy (E-ad) values corresponding to the adsorption on the outer walls of SWCNTs and CBNNTs were calculated to be in the range from - 0.78 to - 0.81 and from - 0.92 to - 0.97 kcal/mol, respectively. The adsorption inside NTs exhibits enhanced E-ad: -4.03 (SWCNTs) and - 3.86 (CBNNTs) kcal/mol. The reduced density gradient (RDG) and independent gradient model (IGM) analyses exhibit dominating non-covalent interactions in all cases. The increase in H-2 coverages in the cases of both types of nanotubes does not lead to the sufficient E-ad decrease. The electronic properties of SWCNTs are independent of H-2 adsorption. Alternatively, these properties of CBNNTs are more sensitive to the H-2 addition, but the changes are rather minor. Our results show that CBNNTs are preferable to pure carbon counterparts for both hydrogen storage and sensing.
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