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Science 2 July 1999:
Vol. 285. no. 5424, pp. 91 - 93
DOI: 10.1126/science.285.5424.91
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Reports

High H2 Uptake by Alkali-Doped Carbon Nanotubes Under Ambient Pressure and Moderate Temperatures

P. Chen, X. Wu, J. Lin, * K. L. Tan

Lithium- or potassium-doped carbon nanotubes can absorb ~20 or ~14 weight percent of hydrogen at moderate (200° to 400°C) or room temperatures, respectively, under ambient pressure. These values are greater than those of metal hydride and cryoadsorption systems. The hydrogen stored in the lithium- or potassium-doped carbon nanotubes can be released at higher temperatures, and the sorption-desorption cycle can be repeated with little decrease in the sorption capacity. The high hydrogen-uptake capacity of these systems may be derived from the special open-edged, layered structure of the carbon nanotubes made from methane, as well as the catalytic effect of alkali metals.

Physics Department, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
*   To whom correspondence should be addressed.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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A. Blomqvist, C. M. Araujo, P. Srepusharawoot, and R. Ahuja (2007)
PNAS 104, 20173-20176
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Hydrogen Storage in Single-Walled Carbon Nanotubes at Room Temperature.
C. Liu, Y. Y. Fan, M. Liu, H. T. Cong, H. M. Cheng, and M. S. Dresselhaus (1999)
Science 286, 1127-1129
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