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Hydrogen adsorption and phase transitions in fullerite

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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Abstract

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.


Item Type:Article
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
Record Number:CaltechAUTHORS:YEYapl00
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:YEYapl00
Alternative URL:http://dx.doi.org/10.1063/1.1312857
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5481
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:19 Oct 2006
Last Modified:26 Dec 2012 09:12

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