Hydrogen adsorption and cohesive energy of single-walled carbon nanotubes

Journal Article · Thu Apr 01 00:00:00 EST 1999 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.123833· OSTI ID:341182

Ye, Y; Ahn, C C; Witham, C; Fultz, B ^[1]; Liu, J; Rinzler, A G; Colbert, D; Smith, K A; Smalley, R E ^[2]

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1. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125 (United States)
2. Center for Nanoscale Science and Technology, Rice Quantum Institute, Departments of Chemistry and Physics, Rice University, Houston, Texas 77005 (United States)

Hydrogen adsorption on crystalline ropes of carbon single-walled nanotubes (SWNT) was found to exceed 8 wt.&hthinsp;{percent}, which is the highest capacity of any carbon material. Hydrogen is first adsorbed on the outer surfaces of the crystalline ropes. At pressures higher than about 40 bar at 80 K, however, a phase transition occurs where there is a separation of the individual SWNTs, and hydrogen is physisorbed on their exposed surfaces. The pressure of this phase transition provides a tube-tube cohesive energy for much of the material of 5 meV/C atom. This small cohesive energy is affected strongly by the quality of crystalline order in the ropes. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 341182
• Journal Information: Applied Physics Letters, Vol. 74, Issue 16; Other Information: PBD: Apr 1999
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN FUEL
36 MATERIALS SCIENCE
BINDING ENERGY
ADSORPTION
HYDROGEN
HYDROGEN STORAGE
CARBON
TUBES
CHEMISORPTION
PRESSURE DEPENDENCE
PHASE TRANSFORMATIONS
HIGH PRESSURE
ADSORPTION ISOTHERMS