Pressure-driven confinement of hydrogen molecules between graphene sheets in the regime of van der Waals repulsion

被引:14
作者
Chan, SP
Ji, M
Gong, XG
Liu, ZF [1 ]
机构
[1] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Ctr Sci Modeling & Computat, Shatin, Hong Kong, Peoples R China
[3] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[4] Chinese Acad Sci, Inst Solid State Phys, Hefei, Anhui, Peoples R China
关键词
D O I
10.1103/PhysRevB.69.092101
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Molecular hydrogen is well-known for its weak van der Waals potential, and as a result, its compressibility, even in its liquid and solid state. This fact gives rise to a large pDeltaV term, which under the right conditions can overcome unfavorable energy and entropy changes for the confinement of H-2, as demonstrated for the confinement of H-2 in graphite. It produces a remarkable two dimensional array of H-2 with ordered orientation, as H-2 is forced into the narrow and seemingly inhospitable space sandwiched between two hexagonal carbon rings. H-2 is thus a unique case in host-guest interaction and in the storage and confinement of gases, as pressure in the gigapascal range provides a powerful variable to manipulate the interaction between H-2 and solid hosts.
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页数:4
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