期刊
PHYSICAL REVIEW B
卷 83, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.115456
关键词
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资金
- National Science Foundation of China [10774148]
- special Funds for Major State Basic Research Project of China (973) [2007CB925004]
- Chinese Academy of Sciences [KJCX2-YW-W07, KJCX2-YW-N35]
We show that a Li-coated zigzag (2,2) boron nanotube can serve as a high-capacity hydrogen storage medium using first-principles density functional theory. The present results indicate that the radial deformation of a Li-coated boron nanotube can strengthen the binding of Li atoms to the boron nanotube due to the hybridization between Li-p orbitals and B-p orbitals. Interestingly, the induced large surface curvature of the Li-coated nanotube can make the H-2 molecules directly adsorbed on the nanotube. Through the electronic analysis we find that not only the polarization mechanism but also the orbital hybridization between H-s orbitals and Li-p (B-p) orbitals act on the adsorbed H-2 molecules. The Li-coated zigzag (2,2) boron nanotube reported here can store hydrogen up to 7.94 wt% with the adsorption energy of 0.12-0.20 eV/H-2 and the whole system is favorable for the reversible hydrogen adsorption/desorption at ambient conditions.
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