Ye, Y. and Ahn, C. C. and Fultz, B. and Vajo, J. J. and Zinck, J. J. (2000) Hydrogen adsorption and phase transitions in fullerite. Applied Physics Letters, 77 (14). pp. 2171-2173. ISSN 0003-6951 http://resolver.caltech.edu/CaltechAUTHORS:YEYapl00
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Hydrogen desorption and adsorption properties of the fullerene materials C60, C70, and fullerite (a mixture of C60 and C70) 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^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 C60 and pure C70 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 C60 oxide.
|Additional Information:||©2000 American Institute of Physics. (Received 25 May 2000; accepted 1 August 2000) This work was supported by DOE through Basic Energy Sciences Grant No. DE-FG03-00ER15035.|
|Subject Keywords:||FULLERENES; PHASE TRANSFORMATIONS; ADSORPTION ISOTHERMS; HYDROGEN STORAGE; CHEMISORPTION; SURFACES; X-RAY DIFFRACTION; CHROMATOGRAPHY; hydrogen; adsorption; desorption; hydrogen economy|
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|Deposited By:||Archive Administrator|
|Deposited On:||19 Oct 2006|
|Last Modified:||26 Dec 2012 09:12|
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