Abstract's Details

Size Dependent Hydrogenation of Carbon Nanotubes
Abstract ID	MAT-24
Presenter	Anton Nikitin
Presentation Type	Poster
Full Author List	A. Nikitin (1), X. Li (2), Z. Zhang (2), H. Ogasawara (1), H. Dai (2), A. Nilsson (1,3)
Affiliations	(1) Stanford Synchrotron Radiation Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA (2) Dept. of Chemistry, Stanford University, Stanford, California 94305 (3) FYSIKUM, Stockholm University, Albanova University Center, S-10691 Stockholm, Sweden
Category	Materials Science
Abstract	In order to determine if carbon-based materials can be used for hydrogen storage we have studied hydrogen chemisorption in single-walled carbon nanotubes. Using atomic hydrogen as hydrogenation agent and probing with X-ray photoelectron spectroscopy and atomic force mi-croscopy we found a dependence on the nanotube diameter of the amount of hydrogenation that can be obtained prior to nanotube decomposition. We demonstrate that for nanotubes with a diameter around 2.0 nm, nanotube – hydrogen complexes with close to 100 % hydrogenation exist and are stable at room temperature. This means that specific carbon nanotubes can have a hydrogen storage capacity of more than 7 wt % through the formation of reversible C-H bonds. We found that most of the C-H bonds formed on the nanotube surface dissociate in the temperature range between 200 and 300 °C. The hydrogen desorption mechanism, driven by reaction kinetics, and the effect of hydrogen diffusion on the nanotube surface on the hydrogenation process are also discussed.
Footnotes
Funding Acknowledgement	This work was supported by the Global Climate and Energy Project operated by Stanford University and carried out at the Stanford Synchrotron Radiation Laboratory, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.