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| Title: | SYNTHESIS OF NOVEL METAL-COORDINATED FULLERENES FOR VEHICULAR HYDROGEN STORAGE | |
| DOI No: | 10.1142/9789812838025_0015 | |
| Source: | MATERIALS ISSUES IN A HYDROGEN ECONOMY (pp 155-172) | |
| Author(s): | E. WHITNEY
National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA C. ENGTRAKUL National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA C. J. CURTIS National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA Y. YAN National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA P. A. PARILLA National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA K. J. O'NEILL National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA L. J. SIMPSON National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA M. J. HEBEN National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA Y. ZHAO National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA Y.–H. KIM National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA S. B. ZHENG National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA A. C. DILLON National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, CO 80401, USA |
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| Abstract: | Experimental wet chemical approaches have been demonstrated in the synthesis of a new chainlike (C60-Fe-C60-Fe)n complex. This structure has been proposed based on 13C solid-state nuclear magnetic resonance, high-resolution transmission electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. Furthermore, this structure has been shown to have unique binding sites for dihydrogen molecules with the technique of temperature-programmed desorption. The new adsorption sites have binding energies that are stronger than that observed for hydrogen physisorbed on planar graphite, but significantly weaker than a chemical C-H bond. Volumetric measurements at 77 K and 2 bar show a hydrogen adsorption capacity of 0.5 wt%. Interestingly, the BET surface area is ~31 m2/g after degassing, which is more than an order of magnitude less than expected given the measured experimental hydrogen capacity. Nitrogen and hydrogen isotherms performed at 75 K show a marked selectivity for hydrogen over nitrogen for this complex, indicating hidden surface area for hydrogen adsorption. Various LixC60 compounds have also been synthesized, inspired by theoretical predictions of an optimized Li12C60 compound with substantial hydrogen capacity. Unfortunately, the theoretical structure was not experimentally achieved, nor was the predicted hydrogen capacity reached. | |
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