Hydrogen adsorption and phase transitions in fullerite

Ye, Y.; Ahn, C. C.; Fultz, B.; Vajo, J. J.; Zinck, J. J.
October 2000
Applied Physics Letters;10/2/2000, Vol. 77 Issue 14
Academic Journal
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. © 2000 American Institute of Physics.


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