Hydrogen adsorption and phase transitions in fullerite
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125 (United States)
- HRL Laboratories, LLC, Malibu, California 90265 (United States)
Hydrogen desorption and adsorption properties of the fullerene materials C{sub 60}, C{sub 70}, and fullerite (a mixture of C{sub 60} and C{sub 70}) were measured volumetrically using a Sievert's apparatus. Over several cycles of isotherm measurements at 77 K, the hydrogen storage capacities of one of the fullerite samples increased from an initial value of 0.4 wt % for the first cycle to a capacity of 4.4 wt % for the fourth cycle. Correspondingly, the surface area of this sample increased from 0.9 to 11 m{sup 2}/g, and there were changes in its x-ray powder diffraction pattern. In comparison, two other fullerite samples, prepared by a different procedure showed no such behavior. Pure C{sub 60} and pure C{sub 70} were also cycled and exhibited small and constant capacities of 0.7 and 0.33 wt %, respectively, as a function of number of cycles. The enhanced storage capacity of fullerite material is tentatively attributed to the presence of C{sub 60} oxide. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20217670
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 14 Vol. 77; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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